CN110174449A - A kind of spherical thermal conductivity gas sensor of pearl and preparation method thereof - Google Patents

A kind of spherical thermal conductivity gas sensor of pearl and preparation method thereof Download PDF

Info

Publication number
CN110174449A
CN110174449A CN201910583260.9A CN201910583260A CN110174449A CN 110174449 A CN110174449 A CN 110174449A CN 201910583260 A CN201910583260 A CN 201910583260A CN 110174449 A CN110174449 A CN 110174449A
Authority
CN
China
Prior art keywords
resistance wire
aluminum oxide
graphene
composite material
thermal conductivity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910583260.9A
Other languages
Chinese (zh)
Inventor
孙永国
李栋辉
于广滨
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harbin University of Science and Technology
Original Assignee
Harbin University of Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harbin University of Science and Technology filed Critical Harbin University of Science and Technology
Priority to CN201910583260.9A priority Critical patent/CN110174449A/en
Publication of CN110174449A publication Critical patent/CN110174449A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/14Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
    • G01N27/18Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
    • G01N27/185Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested using a catharometer

Abstract

The invention discloses a kind of spherical thermal conductivity gas sensors of pearl, comprising: resistance wire, the composite material being sintered simultaneously on the insulating layer and with insulating layer coated in the insulating layer on resistance wire, coating, with the shelter-clad of the pedestal of resistance wire welded connecting, the good air permeability being connect with base engagement.Resistance wire is in hollow ellipsoid shape, and there are the straightways at both ends;Insulating layer material isAluminum oxide nanometer scale ceramics superfines, composite material be carbon nano tube/graphene/The trielement composite material of aluminum oxide.Meanwhile the present invention also provides a kind of preparation methods of the spherical thermal conductivity gas sensor of pearl.The present invention makes full use of the large specific surface area of trielement composite material and the high characteristic of thermal stability, elliposoidal resistance wire are guided the forming of composite material and homogenizing agglomeration, make sensing element that there is uniform temperature field and good heat exchanger effectiveness, achievees the purpose that shorten the response time, improves detection accuracy and prolong the service life.

Description

A kind of spherical thermal conductivity gas sensor of pearl and preparation method thereof
Technical field
The invention belongs to gas detection technology field, it is related to a kind of spherical thermal conductivity gas sensor of pearl and its preparation side Method, in particular to a kind of pearl based on carbon nano tube/graphene/α aluminum oxide trielement composite material spheroid shape resistance wire Spherical thermal conductivity gas sensor and preparation method thereof.
Background technique
Thermal conductivity gas sensor is detected using the different characteristic of different types of various concentration gas conduction rate.? In the industries such as medicine, food, tobacco, coal, petroleum, the concentration of various volatile organic compounds, detection pernicious gas is monitored Aspect thermal conductivity sensor has a wide range of applications.In particular, thermal conductivity gas sensor is in terms of detecting flammable explosive gas Compared with the other types gas sensor such as combustion type gas sensor, more securely and reliably, there is irreplaceable role.Pearl is spherical Thermal conductivity gas sensor is the main Types of thermal conductivity gas sensor.
The apolegamy of sensor sensing material and the shape of resistance wire are to improve the key factor of gas sensor performance.Pearl ball The sensing element of shape thermal conductivity sensor is mostly used is overmolding to that pearl is spherical and high temperature sintering sensitive material on cylindrical resistance wire Mode prepare.During being overmolding to pearl, the cylinder of resistance wire lacks guiding function to sensitive material slurry, causes pearl ball Shape sensitive component surfaces Forming Quality is not high and density of material is unevenly distributed;With cylindrical resistance wire sensitive material spherical to pearl In the high-temperature sintering process of material, due to sensitive material be heated it is uneven so that sensitive material generate it is irregular reunite, cause in Portion is also easy to produce the problem of micro-crack.In addition, the problem of the generally existing thermal stability deficiency of gas sensor, further improves heat Stability is also the hot spot of research.
Graphene belongs to two-dimentional carbon nanomaterial, in the form of sheets structure, has specific surface area height, excellent thermal conductivity, mechanicalness The characteristics such as energy is good, chemical property is stablized, but it is easy to assemble agglomeration, so as to cause the reduction of its specific surface area;Carbon nanotube is one Carbon nanomaterial is tieed up, is in perforated tubular, being doped in graphene sheet layer can agglomerate to avoid the aggregation of graphene sheet layer;Tri- oxygen of α Change two aluminium with indeformable thermal stability under the trace doped load capacity of uniqueness and high temperature of stable crystal form.
201510272072.6 patent of application number discloses a kind of graphene/multi-walled carbon nanotube/zinc oxide composite Resistor-type gas sensor and production method, the patent realized using the graphene satisfactory electrical conductivity compound with carbon nanotube Gas concentration detection under room temperature, and there is faster response speed, but its recovery time senses compared with heat-conducted gas The recovery time of device is long, and there is certain application limitations.Graphene/carbon nano-tube/metal oxide ternary composite material system Standby resistor-type gas sensor has become the hot spot of research.
201510951882.4 patent of application number discloses a kind of gas sensor, the measuring cell for gas sensor And its manufacturing method.The sensor of the invention includes shell and measuring cell, measuring cell by heating coil silk and be coated on plus The bead-like body ceramics comprising fibrous material on hot taenidium, solve carrier when sensor is subject to big mechanical load and urge Change the impaired problem of element bead-like body.Heating coil silk described in the patent is cylindric.Harbin Engineering University Zhang Hongquan The sensing element of the micro-structure methane gas sensor of development is spherical in pearl, and what the resistance wire inside sensing element used is also round Column.
It is retrieved by open source information as it can be seen that using graphene/carbon nano-tube/metal oxide ternary composite material preparation preparation The sensitive material of the gas sensor of high-specific surface area belongs to research hotspot, but using carbon nano-tube material as porous logical Road, graphene carry out tri compound as quick as thermal stability framework material as high conductivity material and α aluminum oxide Feel material, and is had not been reported using the thermal conductivity gas sensor of spheroid shape resistance wire preparation.
Summary of the invention
The object of the present invention is to provide spherical thermal conductivity gas sensors of a kind of pearl and preparation method thereof, utilize tri compound The high characteristic of the high-specific surface area and thermal stability of material, elliposoidal resistance wire is guided the forming of composite material and homogenizing is reunited It acts on, surface forming is of low quality, density of material is unevenly distributed, there are micro-crack, high temperature are steady existing for solution sensing element The problems such as qualitative difference, makes sensing element have uniform temperature field and good heat exchanger effectiveness, reaches shortening response and restores Time, the purpose for improving detection accuracy and prolonging the service life.
Technical solution of the present invention: a kind of spherical thermal conductivity gas sensor of pearl, comprising: resistance wire is coated in resistance wire On insulating layer, coated in the composite material being sintered simultaneously on the insulating layer and with the insulating layer, with resistance wire welding connect The shelter-clad of the pedestal, the good air permeability being connect with base engagement that connect.Resistance wire is in hollow ellipsoid shape, and there are two The straightway at end;Insulating layer material is α aluminum oxide nanometer scale ceramics superfines;Composite material is carbon nanotube/graphite Alkene/α aluminum oxide trielement composite material.Insulating layer can be such that resistance wire keeps apart with composite material, between prevention the two Shunting function.
Further, the resistance wire is one or more of platinum, palladium, rhodium, iridium, ruthenium, osmium, tungsten.
Further, the carbon nanotube is oxidized single-walled carbon nanotubes, oxidation double-walled carbon nano-tube or oxidation multi wall carbon One of nanotube.
Further, the graphene is graphene quantum dot, graphene nanometer sheet, graphene oxide, oxygen reduction fossil One of black alkene or porous graphene.
Further, retain spacing between the coil of the resistance wire.
Further, the thermal conductivity gas sensor can detecte He, CO2、H2、CH4One or more of gas Mixing.
The invention also discloses a kind of preparation methods of the spherical thermal conductivity gas sensor of pearl, comprising the following steps:
1) spheroid shape resistance wire is wound with coil winding machine;
2) tri compound sensitive material slurry is prepared;
3) resistance wire is welded on pedestal;
4) coating slurry on resistance wire;
5) energization high temperature sintering molding is carried out;
6) shield is coupled on pedestal.
Further, it is prepared described in step 2, comprising the following steps:
A) α aluminum oxide nanometer scale ceramics ultra-fine powder materials are prepared using chemical precipitation method;
B) α aluminum oxide ternary slurry is prepared, process is as follows: α aluminum oxide material and glycerol prepared by step (a) It is mixed by weight 1:0.1~2, ultrasonic disperse makes its mixing sufficiently, and α aluminum oxide slurry is made;
C) carbon nano tube/graphene/α aluminum oxide trielement composite material is prepared, process is as follows: by α aluminum oxide, carbon 1:4~5:4~5 is mixed by volume for nanotube, graphene, and by mixture, xylene solution is added in 1:100~300 by volume In, stirring makes it be uniformly dispersed, and carbon nano tube/graphene/α aluminum oxide trielement composite material solution is made;It will be above-mentioned molten Liquid is centrifuged, washes and dries, and obtains carbon nano tube/graphene/α aluminum oxide trielement composite material.
D) carbon nano tube/graphene/α aluminum oxide trielement composite material slurry is prepared, process is as follows: by step (c) carbon nano tube/graphene/α aluminum oxide trielement composite material prepared is mixed with glycerol by weight 1:0.1~2, is surpassed Sound dispersion makes its mixing sufficiently, and carbon nano tube/graphene/α aluminum oxide trielement composite material slurry is made.
Further, it is coated described in step 4, comprising the following steps:
A) the α aluminum oxide slurry of one layer of preparation is coated on the resistance wire;
B) the trielement composite material slurry of preparation is coated outside α aluminum oxide pulp layer and in resistance wire ellipsoid inner cavity.
Further, the molding of high temperature sintering described in step 5 is realized using following procedure: under high pure nitrogen protection, to institute Semi-finished product load DC voltage is stated, the sintering current of 160mA is passed to, temperature is controlled at 600 DEG C or so, remains powered on 60min.
Beneficial effects of the present invention:
1) carbon nanotube is one-dimensional porous carbon nanomaterial, when thermal conductivity gas sensor and gas are contacted as gas exchanges Access;Graphene is two-dimentional carbon nanomaterial, has good heating conduction;α aluminum oxide has the only of stable crystal form Indeformable physical performance under special trace doped load capacity and high temperature, the skeleton as sensitive material.The present invention will be with Sensitive material of the upper triplicity as the spherical thermal conductivity gas sensor of pearl, so that sensitive material specific surface area with higher And thermal stability, the heat exchanger effectiveness and thermal adaptability of sensor can be greatlyd improve.
2) resistance wire for using spheroid-like, can effectively improve the surface forming quality and material of the spherical sensing element of pearl The uniformity coefficient of Density Distribution reduces the even degree of uneven heating of sensitive material when sintering at high temperature, reduces the micro- of internal generation Crackle, meanwhile, make gas sensor that can form homogeneous temperature field at work, improves the reliability of gas sensor and use the longevity Life.
3) for graphene sheet as black, carbon nanotube is compound with graphene, can omit the melanism of previous sensitive material preparation Step enhances thermal energy utilization efficiency, improves radiating efficiency.
The present invention makes full use of the high-specific surface area of trielement composite material and the high characteristic of thermal stability, elliposoidal resistance wire Forming guidance and homogenizing agglomeration to composite material, make sensing element that there is uniform temperature field and good heat exchange to imitate Rate achievees the purpose that shorten the response time, improves detection accuracy and prolong the service life.
Detailed description of the invention
The advantages of above-mentioned and/or additional aspect of the invention, will be apparent from the description of the embodiment in conjunction with the following figures Be readily appreciated that, in which:
Fig. 1 show a kind of embodiment 1 of spherical thermal conductivity gas sensor of pearl of the present invention and the structural schematic diagram of embodiment 2;
Fig. 2-1 show a kind of sensing element structural schematic diagram of the embodiment 1 of the spherical thermal conductivity gas sensor of pearl of the present invention;
Fig. 2-2 show a kind of sensing element structural profile knot of the embodiment 1 of the spherical thermal conductivity gas sensor of pearl of the present invention Structure partial enlargement diagram;
Fig. 3-1 show a kind of sensing element cross-section structure of the embodiment 2 of the spherical thermal conductivity gas sensor of pearl of the present invention and shows It is intended to;
Fig. 3-2 show a kind of sensing element cross-section structure office of the embodiment 2 of the spherical thermal conductivity gas sensor of pearl of the present invention Portion's enlarged diagram;
Fig. 4 show a kind of process of the embodiment 1 of the spherical thermal conductivity gas sensor preparation method of pearl and embodiment 2 of the present invention Figure.
The wherein corresponding relationship in Fig. 1 to Fig. 4 between appended drawing reference and component names are as follows:
1, composite material;2, resistance wire;3, sensing element;4, pedestal;5, shelter-clad;6, α aluminum oxide insulating layer.
Specific embodiment
Below in conjunction with 2 the present invention is described in detail of specific embodiment 1 and embodiment.It should be noted that following embodiments Described in technical characteristic or technical characteristic combination be not construed as it is isolated, they can by be combined with each other to Reach superior technique effect.
Embodiment 1
The embodiment of the present invention 1 is described in conjunction with Fig. 1, Fig. 2-1 and Fig. 2-2: a kind of spherical thermal conductivity gas sensor of pearl, comprising: Resistance wire 2, coated on the resistance wire insulating layer 6, coated in being burnt simultaneously on the insulating layer 6 and with the insulating layer 6 The composite material 1 of knot, with the resistance wire be welded to connect pedestal 4, the good air permeability being connect with the base engagement gold Belong to shield 5.The resistance wire 2 is in hollow ellipsoid shape, and there are the straightways at both ends;6 material of insulating layer is tri- oxygen of α Change two aluminium nanometer scale ceramics superfines;The composite material 1 is oxidation multi-wall carbon nano-tube tube/oxidation of graphene oxide/α tri- two The trielement composite material of aluminium.The insulating layer 6 can be such that the resistance wire 2 keeps apart with the composite material 1, between prevention the two Shunting function.
In embodiment 1, the resistance wire 2 is one or more of platinum, palladium, rhodium, iridium, ruthenium, osmium, tungsten.Preferential selection Platinum.
In embodiment 1, the carbon nanotube is oxidized single-walled carbon nanotubes, oxidation double-walled carbon nano-tube or oxidation multi wall One of carbon nanotube.Preferential selective oxidation multi-walled carbon nanotube.
In embodiment 1, the graphene is graphene quantum dot, graphene nanometer sheet, graphene oxide, reduction-oxidation One of graphene or porous graphene.Preferential selective oxidation graphene.
In embodiment 1, retain spacing between the coil of the resistance wire 2.
In embodiment 1, the thermal conductivity gas sensor can detecte He, CO2、H2、CH4One of gas or A variety of mixing.
Referring to fig. 4, the present invention also provides a kind of embodiments: a kind of preparation side of the spherical thermal conductivity gas sensor of pearl Method, comprising the following steps:
Step 100: being wound spheroid shape resistance wire with coil winding machine;
Step 200: preparing tri compound sensitive material slurry;
Step 300: resistance wire is welded on pedestal;
Step 400: the coating slurry on resistance wire;
Step 500: carrying out energization high temperature sintering molding;
Step 600: shield is coupled on pedestal.
In embodiment 1, it is prepared described in step 200, comprising the following steps:
A) the α aluminum oxide nanometer scale ceramics ultra-fine powder materials are prepared using chemical precipitation method;
B) oxidation multi-wall carbon nano-tube tube/graphene oxide/α aluminum oxide trielement composite material is prepared, process is as follows: by α 1:4~5:4~5 is mixed by volume for aluminum oxide, oxidation multi-wall carbon nano-tube tube, graphene oxide, and mixture is pressed volume It is added in xylene solution than 1:100~300, stirring makes it be uniformly dispersed, and oxidation multi-wall carbon nano-tube tube/graphite oxide is made Alkene/α aluminum oxide trielement composite material solution;Above-mentioned solution is centrifuged, washed and dried, oxidation multi wall is obtained Carbon nanotube/graphene oxide/α aluminum oxide trielement composite material;
C) oxidation multi-wall carbon nano-tube tube/graphene oxide/α aluminum oxide trielement composite material slurry is prepared, process is as follows: By oxidation multi-wall carbon nano-tube tube/graphene oxide/α aluminum oxide trielement composite material of step (b) preparation and glycerol by weight Amount is mixed than 1:0.1~2, and ultrasonic disperse makes its mixing sufficiently, and the oxidation multi-wall carbon nano-tube tube/graphene oxide/α tri- is made Al 2 O trielement composite material slurry.
In embodiment 1, it is coated described in step 400, comprising the following steps:
A) the α aluminum oxide slurry that one layer of preparation is coated on the resistance wire 2, forms insulating layer 6;
B) the trielement composite material slurry of preparation is coated outside α aluminum oxide pulp layer and in resistance wire ellipsoid inner cavity, Form composite material 1;
In embodiment 1, the molding of high temperature sintering described in step 500 is realized using following procedure: under high pure nitrogen protection, to institute Semi-finished product load DC voltage is stated, the sintering current of 160mA is passed to, temperature is controlled at 600 DEG C or so, remains powered on 60min.
Embodiment 2
The embodiment of the present invention 2 is described in conjunction with Fig. 1, Fig. 3-1 and Fig. 3-2: a kind of spherical thermal conductivity gas sensor of pearl, construction Embodiment 1 is improved, comprising: resistance wire 2, coated on the resistance wire insulating layer 6, be coated in the insulating layer The composite material 1 being sintered simultaneously on 6 and with the insulating layer 6, the pedestal 4 and the pedestal that are welded to connect with the resistance wire The shelter-clad 5 of the good air permeability of mating connection.The resistance wire 2 is in hollow ellipsoid shape, and there are the straight lines at both ends Section;The material of the insulating layer 6 is α aluminum oxide nanometer scale ceramics superfines;The composite material 1 is oxidation multi wall carbon Nanotube/redox graphene/α aluminum oxide trielement composite material.The α aluminum oxide insulating layer 6 of sinter molding Be divided into two parts: the α aluminum oxide insulating layer 6 coated on the resistance wire 2 can make the resistance wire 2 with it is compound Material 1 is kept apart, and the shunting function between the two is prevented;The ellipsoid α aluminum oxide insulating layer of 2 inner core of resistance wire 6 prevent irregular flowing of the under test gas inside the resistance wire 2, improve the thermostabilization of thermal conductivity gas sensor Property.
In example 2, the resistance wire 2 is one or more of platinum, palladium, rhodium, iridium, ruthenium, osmium, tungsten.Preferential selection Platinum.
In example 2, the carbon nanotube is oxidized single-walled carbon nanotubes, oxidation double-walled carbon nano-tube or oxidation multi wall One of carbon nanotube.Preferential selective oxidation multi-walled carbon nanotube.
In example 2, the graphene is graphene quantum dot, graphene nanometer sheet, graphene oxide, reduction-oxidation One of graphene or porous graphene.Preferential selective reduction graphene oxide.
In example 2, retain spacing between the coil of the resistance wire 2.
In example 2, the thermal conductivity gas sensor can detecte He, CO2、H2、CH4One of gas or A variety of mixing.
Referring to fig. 4, the present invention also provides a kind of embodiments: a kind of preparation side of the spherical thermal conductivity gas sensor of pearl Method, comprising the following steps:
Step 100: being wound spheroid shape resistance wire with coil winding machine;
Step 200: preparing trielement composite material slurry;
Step 300: resistance wire is welded on pedestal;
Step 400: the coating slurry on resistance wire;
Step 500: carrying out energization high temperature sintering molding;
Step 600: shield is coupled on pedestal.
In example 2, it is prepared described in step 200, comprising the following steps:
A) α aluminum oxide nanometer scale ceramics ultra-fine powder materials are prepared using chemical precipitation method;
B) oxidation multi-wall carbon nano-tube tube/redox graphene/α aluminum oxide trielement composite material is prepared, process is as follows: By α aluminum oxide, oxidation multi-wall carbon nano-tube tube, redox graphene, 1:4~5:4~5 is mixed by volume, by mixture 1:100~300 is added in xylene solution by volume, and stirring makes it be uniformly dispersed, and oxidation multi-wall carbon nano-tube tube/reduction is made Graphene oxide/α aluminum oxide trielement composite material solution;Above-mentioned solution is centrifuged, washed and dried, is obtained Oxidation multi-wall carbon nano-tube tube/redox graphene/α aluminum oxide trielement composite material;
C) prepare α aluminum oxide slurry, process is as follows: α aluminum oxide nanometer scale ceramics prepared by step (a) are ultra-fine Dusty material is mixed with glycerol by weight 1:0.1~2, and ultrasonic disperse makes its mixing sufficiently, and α aluminum oxide slurry is made;
D) oxidation multi-wall carbon nano-tube tube/redox graphene/α aluminum oxide trielement composite material slurry, process are prepared It is as follows: by step (b) preparation oxidation multi-wall carbon nano-tube tube/redox graphene/α aluminum oxide trielement composite material with Glycerol is mixed by weight 1:0.1~2, and ultrasonic disperse makes its mixing sufficiently, and oxidation multi-wall carbon nano-tube tube/oxygen reduction fossil is made Black alkene/α aluminum oxide trielement composite material slurry.
In example 2, on resistance wire 2 described in step 400 the step of coating slurry in two steps, specifically, first described Upper suitable α aluminum oxide slurry is filled in resistance wire ellipsoid inner cavity, then is coated one layer of α tri- on the resistance wire and aoxidized Two aluminum slurries;Oxidation multi-wall carbon nano-tube tube/oxidation of redox graphene/α tri- two is coated outside α aluminum oxide pulp layer again Aluminium trielement composite material slurry.
In example 2, the molding of high temperature sintering described in step 500 is realized using following procedure: under high pure nitrogen protection, DC voltage is loaded to the semi-finished product, passes to the sintering current of 160mA, temperature is controlled at 600 DEG C or so, remained powered on 60min。
The present invention makes full use of the high-specific surface area of trielement composite material and the high characteristic of thermal stability, elliposoidal resistance wire Forming guidance and homogenizing agglomeration to composite material, make sensing element that there is uniform temperature field and good heat exchange to imitate Rate achievees the purpose that shorten the response time, improves detection accuracy and prolong the service life.
Although the embodiment of the present invention is had been presented for herein, for it will be appreciated by those skilled in the art that this hair Bright patent is not limited to the details of above-mentioned exemplary embodiment, and in the feelings of the spirit or essential attributes without departing substantially from the invention patent Under condition, the invention patent can be realized with other assembling forms.Above-described embodiment is only exemplary, the model of the invention patent It encloses and is indicated by the appended claims rather than the foregoing description, it is intended that by the meaning and model of the condition of equivalent for falling in claim All changes in enclosing are included in the invention patent.It should not be using the embodiments herein as the restriction of interest field of the present invention.

Claims (10)

1. a kind of spherical thermal conductivity gas sensor of pearl, comprising: resistance wire, coated on resistance wire insulating layer, be coated in institute Composite material, the pedestal and base engagement with resistance wire welded connecting stated on insulating layer and be sintered simultaneously with the insulating layer The shelter-clad of the good air permeability of connection;Resistance wire is in hollow ellipsoid shape, and there are the straightways at both ends;Insulating layer material Material isAluminum oxide nanometer scale ceramics superfines, composite material be carbon nano tube/graphene/The three of aluminum oxide First composite material;Insulating layer can be such that resistance wire keeps apart with composite material, prevent the shunting function between the two.
2. the spherical thermal conductivity gas sensor of pearl as described in claim 1, which is characterized in that the resistance wire be platinum, palladium, One or more of rhodium, iridium, ruthenium, osmium, tungsten.
3. the spherical thermal conductivity gas sensor of pearl as described in claim 1, which is characterized in that the carbon nanotube is that oxidation is single Wall carbon nano tube, oxidation one of double-walled carbon nano-tube or oxidation multi-wall carbon nano-tube tube.
4. the spherical thermal conductivity gas sensor of pearl as described in claim 1, which is characterized in that the graphene is graphene amount One of sub- point, graphene nanometer sheet, graphene oxide, redox graphene or porous graphene.
5. the spherical thermal conductivity gas sensor of pearl as described in claim 1, which is characterized in that between the coil of the resistance wire Retain spacing.
6. the spherical thermal conductivity gas sensor of pearl as described in claim 1, which is characterized in that the thermal conductivity gas sensor It can detecte He, CO2、H2、CH4The mixing of one or more of gas.
7. the preparation method of the spherical thermal conductivity gas sensor of pearl as described in claim 1, which is characterized in that including following step It is rapid:
1) spheroid shape resistance wire is wound with coil winding machine;
2) tri compound sensitive material slurry is prepared;
3) resistance wire is welded on pedestal;
4) coating slurry on resistance wire;
5) energization high temperature sintering molding is carried out;
6) shield is coupled on pedestal.
8. the preparation method of the spherical thermal conductivity gas sensor of pearl as claimed in claim 7, which is characterized in that described in step 2 Preparation, comprising the following steps:
A) it is prepared using chemical precipitation methodAluminum oxide nanometer scale ceramics ultra-fine powder materials;
B) it preparesAluminum oxide ternary slurry, process are as follows: by step (a) preparationAluminum oxide material and glycerol It is mixed by weight 1:0.1 ~ 2, ultrasonic disperse makes its mixing sufficiently, is madeAluminum oxide slurry;
C) prepare carbon nano tube/graphene/Aluminum oxide trielement composite material, process are as follows: willAluminum oxide, carbon 1:4 ~ 5:4 ~ 5 is mixed by volume for nanotube, graphene, and by mixture, xylene solution is added in 1:100 ~ 300 by volume In, stirring makes it be uniformly dispersed, and obtained carbon nano tube/graphene/Aluminum oxide trielement composite material solution;It will be above-mentioned molten Liquid is centrifuged, washes and dries, and acquisition carbon nano tube/graphene/Aluminum oxide trielement composite material;
D) prepare carbon nano tube/graphene/Aluminum oxide trielement composite material slurry, process are as follows: step (c) is made Standby carbon nano tube/graphene/Aluminum oxide trielement composite material is mixed with glycerol by weight 1:0.1 ~ 2, ultrasonic disperse Make its mixing sufficiently, obtained carbon nano tube/graphene/Aluminum oxide trielement composite material slurry.
9. the preparation method of the spherical thermal conductivity gas sensor of pearl as claimed in claim 7, which is characterized in that described in step 4 Coating, comprising the following steps:
A) one layer of preparation is coated on the resistance wireAluminum oxide slurry;
B) existThe trielement composite material slurry of preparation is coated outside aluminum oxide pulp layer and in resistance wire ellipsoid inner cavity.
10. the preparation method of the spherical thermal conductivity gas sensor of pearl as claimed in claim 7, which is characterized in that described in step 5 High temperature sintering molding is realized using following procedure: under high pure nitrogen protection, being loaded DC voltage to the semi-finished product, is passed to The sintering current of 160mA, temperature are controlled at 600 DEG C or so, remain powered on 60min.
CN201910583260.9A 2019-07-01 2019-07-01 A kind of spherical thermal conductivity gas sensor of pearl and preparation method thereof Pending CN110174449A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910583260.9A CN110174449A (en) 2019-07-01 2019-07-01 A kind of spherical thermal conductivity gas sensor of pearl and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910583260.9A CN110174449A (en) 2019-07-01 2019-07-01 A kind of spherical thermal conductivity gas sensor of pearl and preparation method thereof

Publications (1)

Publication Number Publication Date
CN110174449A true CN110174449A (en) 2019-08-27

Family

ID=67699583

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910583260.9A Pending CN110174449A (en) 2019-07-01 2019-07-01 A kind of spherical thermal conductivity gas sensor of pearl and preparation method thereof

Country Status (1)

Country Link
CN (1) CN110174449A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3819260A1 (en) * 2019-11-07 2021-05-12 Infineon Technologies AG A composite material, a chemoresistive gas sensor, a chemoresistive gas sensor system and a method for making and using same

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101059467A (en) * 2007-06-07 2007-10-24 上海交通大学 Catalytic combustion type sensor sensitive body self-assembled molding method
CN102636522A (en) * 2012-03-29 2012-08-15 浙江大学 Graphene/ stannic oxide nanometer compounding resistance type film gas sensor and manufacturing method thereof
CN102719693A (en) * 2012-06-11 2012-10-10 上海交通大学 Graphene and carbon nanotube mixed enhanced metal-matrix composite material and preparation method thereof
CN104849324A (en) * 2015-05-25 2015-08-19 吉林大学 Resistance-type gas sensor based on graphene/multi-walled carbon nano-tube/zinc oxide composite material, and manufacturing method of resistance-type gas sensor
CN105004765A (en) * 2015-07-02 2015-10-28 吉林大学 Mesoporous CuO/SnO2 adsorption enhanced sensor, and detection method
CN105717169A (en) * 2014-12-18 2016-06-29 德尔格安全股份两合公司 Gas sensor, measuring element for a gas sensor and method for preparing a measuring element
CN105891271A (en) * 2016-03-31 2016-08-24 吉林大学 Resistance-type gas sensor based on graphene, stannic oxide and zinc oxide composite, preparation method and application thereof
CN106990142A (en) * 2017-05-09 2017-07-28 大连理工大学 A kind of NO based on graphene/tin dioxide quantal-point composite2Sensor and preparation method thereof
CN108614009A (en) * 2018-05-23 2018-10-02 哈尔滨工程大学 A kind of manufacturing method, sensor and its application of tubulose spoke type nano-tube array carrier gas sensor
CN109839408A (en) * 2017-11-24 2019-06-04 中国科学院大连化学物理研究所 It is a kind of using nanocomposite as the ammonia gas sensor of sensing membrane

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101059467A (en) * 2007-06-07 2007-10-24 上海交通大学 Catalytic combustion type sensor sensitive body self-assembled molding method
CN102636522A (en) * 2012-03-29 2012-08-15 浙江大学 Graphene/ stannic oxide nanometer compounding resistance type film gas sensor and manufacturing method thereof
CN102719693A (en) * 2012-06-11 2012-10-10 上海交通大学 Graphene and carbon nanotube mixed enhanced metal-matrix composite material and preparation method thereof
CN105717169A (en) * 2014-12-18 2016-06-29 德尔格安全股份两合公司 Gas sensor, measuring element for a gas sensor and method for preparing a measuring element
CN104849324A (en) * 2015-05-25 2015-08-19 吉林大学 Resistance-type gas sensor based on graphene/multi-walled carbon nano-tube/zinc oxide composite material, and manufacturing method of resistance-type gas sensor
CN105004765A (en) * 2015-07-02 2015-10-28 吉林大学 Mesoporous CuO/SnO2 adsorption enhanced sensor, and detection method
CN105891271A (en) * 2016-03-31 2016-08-24 吉林大学 Resistance-type gas sensor based on graphene, stannic oxide and zinc oxide composite, preparation method and application thereof
CN106990142A (en) * 2017-05-09 2017-07-28 大连理工大学 A kind of NO based on graphene/tin dioxide quantal-point composite2Sensor and preparation method thereof
CN109839408A (en) * 2017-11-24 2019-06-04 中国科学院大连化学物理研究所 It is a kind of using nanocomposite as the ammonia gas sensor of sensing membrane
CN108614009A (en) * 2018-05-23 2018-10-02 哈尔滨工程大学 A kind of manufacturing method, sensor and its application of tubulose spoke type nano-tube array carrier gas sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3819260A1 (en) * 2019-11-07 2021-05-12 Infineon Technologies AG A composite material, a chemoresistive gas sensor, a chemoresistive gas sensor system and a method for making and using same

Similar Documents

Publication Publication Date Title
Li et al. Immobilization of Ni3Co nanoparticles into N‐doped carbon nanotube/nanofiber integrated hierarchically branched architectures toward efficient overall water splitting
Zhao et al. Nickel oxide/carbon nanotube nanocomposites prepared by atomic layer deposition for electrochemical sensing of hydroquinone and catechol
Cao et al. Bamboo‐Like Nitrogen‐Doped Carbon Nanotubes with Co Nanoparticles Encapsulated at the Tips: Uniform and Large‐Scale Synthesis and High‐Performance Electrocatalysts for Oxygen Reduction
Feng et al. One-pot synthesis of In doped NiO nanofibers and their gas sensing properties
Wang et al. Hollow‐Structured Carbon‐Supported Nickel Cobaltite Nanoparticles as an Efficient Bifunctional Electrocatalyst for the Oxygen Reduction and Evolution Reactions
Song et al. Facile synthesis of Mo2C nanoparticles on N-doped carbon nanotubes with enhanced electrocatalytic activity for hydrogen evolution and oxygen reduction reactions
TW211624B (en)
Ohgi et al. Zirconium oxide-based compound as new cathode without platinum group metals for PEFC
Hsieh et al. Electrochemical activity and stability of Pt catalysts on carbon nanotube/carbon paper composite electrodes
CN106268817A (en) A kind of preparation method of non-precious metal catalyst and products thereof
Li et al. A high‐performance supercapacitor with well‐dispersed Bi2O3 nanospheres and active‐carbon electrodes
Gizem Güneştekin et al. Efficient direct‐methanol fuel cell based on graphene quantum dots/multi‐walled carbon nanotubes composite
Sun et al. An Electrochemical Sensor Based on Nitrogen‐doped Carbon Nanofiber for Bisphenol A Determination
Zhao et al. Facile synthesis of tortoise shell-like porous NiCo2O4 nanoplate with promising triethylamine gas sensing properties
CN105895382A (en) Self-supporting flexible composite electrode film, preparation method and application thereof
Dhall et al. Room temperature hydrogen gas sensors of functionalized carbon nanotubes based hybrid nanostructure: role of Pt sputtered nanoparticles
Tao et al. Ultrathin wall (1 nm) and superlong Pt nanotubes with enhanced oxygen reduction reaction performance
JP2009125693A (en) Catalyst body and its production method
Sripada et al. Platinum and platinum–iron alloy nanoparticles dispersed nitrogen-doped graphene as high performance room temperature hydrogen sensor
Li et al. Graphitized carbon nanocages/palladium nanoparticles: Sustainable preparation and electrocatalytic performances towards ethanol oxidation reaction
CN108314095A (en) A kind of preparation method of nickel ferrite based magnetic loaded nano material
Liu et al. High‐Performance Oxygen Reduction Electrocatalysis Enabled by 3D PdNi Nanocorals with Hierarchical Porosity
CN105911105B (en) SnO2CO sensing materials of doped catalyst and its preparation method and application
CN110174449A (en) A kind of spherical thermal conductivity gas sensor of pearl and preparation method thereof
Yuan et al. Beads‐on‐string hierarchical structured electrocatalysts for efficient oxygen reduction reaction

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination