CN107290389A - Gas sensitive of low concentration formaldehyde and preparation method thereof, gas sensor are detected for room temperature - Google Patents
Gas sensitive of low concentration formaldehyde and preparation method thereof, gas sensor are detected for room temperature Download PDFInfo
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- CN107290389A CN107290389A CN201710439435.XA CN201710439435A CN107290389A CN 107290389 A CN107290389 A CN 107290389A CN 201710439435 A CN201710439435 A CN 201710439435A CN 107290389 A CN107290389 A CN 107290389A
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
Abstract
The invention provides a kind of gas sensitive that low concentration formaldehyde is detected for room temperature, the gas sensitive is：Noble metal, metal oxide and functionalization graphene trielement composite material, wherein, the mol ratio of metal oxide and noble metal is 0.2 5, and the quality of functionalization graphene is the 15 50% of metal oxide and noble metal quality sum；Or noble metal, metal hydroxides and functionalization graphene trielement composite material, wherein, the mol ratio of metal hydroxides and noble metal is 0.2 5, and the quality of functionalization graphene is the 15 50% of metal hydroxides and noble metal quality sum.Compared with traditional metal oxide gas sensitive, gas sensitive of the invention and the gas sensor comprising the gas sensitive, it does not need high-temperature work environment, greatly reduces power consumption, saves resource.The material needed on each sensor substrate is less, therefore the advantage of lower cost of material, can be conducive to the industrialized implementation of formaldehyde gas sensor.
Description
Technical field
The present invention relates to gas sensor technology field, more particularly to a kind of gas that low concentration formaldehyde is detected for room temperature
Quick material and preparation method thereof, gas sensor.
Background technology
With the improvement of people ' s living standards and the transformation that requires furniture environmental decoration of people so that IAQ
Problem becomes increasingly conspicuous, and the main dusty gas in house decoration rear chamber is formaldehyde and benzene homologues.Suck the formaldehyde gas of high concentration
People is known from experience and produces very big harm, for example, headache, nausea, cough, functions of intestines and stomach disorder symptoms occurs.According to correlative study,
If the formaldehyde gas concentration in interior exceedes 10 times or so of the indoor formaldehyde concentration standard of national regulation, in indoor people
Equivalent in Chronic Suicide.Therefore, the formaldehyde in detection room air has great to protection health and environmental protection
Meaning.
Traditional Analysis Methods for Formaldehyde is a lot, but most of formaldehyde gas sensors are all based on electrochemical measurement, to pass
The sensor of system has accuracy poor, not good enough, the shortcomings of volume is big of selectivity.And existing highly sensitive formaldehyde
Gas sensor is required to detect under conditions of heating, and power consumption is very big, thus research and develop small low in energy consumption, component size, long lifespan,
Cheap sensor becomes very meaningful.
The content of the invention
It is an object of the present invention to provide a kind of gas sensitive that low concentration formaldehyde is detected for room temperature, the air-sensitive
Material is：
Noble metal, metal oxide and functionalization graphene trielement composite material, wherein, the metal oxide and described
The mol ratio of noble metal is 0.2-5, and the quality of the functionalization graphene is the metal oxide and the noble metal quality
The 15-50% of sum；Or
Noble metal, metal hydroxides and functionalization graphene trielement composite material, wherein, the metal hydroxides and
The mol ratio of the noble metal is 0.2-5, and the quality of the functionalization graphene is the metal hydroxides and your gold
Belong to the 15-50% of quality sum；
Wherein, the gas sensitive can detect the formaldehyde gas that concentration is ppb grades at room temperature.
Further, the noble metal is Pt, Au or Pd metal；
Wherein, the metal oxide is nickel oxide, ferriferous oxide, cobalt/cobalt oxide, Mn oxide or tin-oxide.
Further, the gas sensitive is Pt-NiO-RGO trielement composite materials, wherein, NiO and Pt mol ratio are
0.6-0.8, RGO quality are the 20-30% of NiO and Pt quality sums.
Further, the gas sensitive is Pt-Ni (OH)2- RGO trielement composite materials, wherein, Ni (OH)2With rubbing for Pt
You are than being 0.5-1, and RGO quality is Ni (OH)2With the 25-28% of Pt quality sums.
Especially, present invention also offers a kind of preparation method for the gas sensitive that low concentration formaldehyde is detected for room temperature,
Comprise the following steps：
Graphene oxide powder is provided；
The graphene powder is scattered in organic solvent, and add the alkali of metal salt solution and hydroxide ion type with
Reacted, obtain metal hydroxides and graphene oxide composite material；
The metal hydroxides and graphene oxide composite material is scattered in organic solvent, and add before noble metal
Drive liquid solution and reducing agent to be reacted, obtain noble metal, metal hydroxides and functionalization graphene trielement composite material；
Or also comprise the following steps：
The noble metal, metal hydroxides and functionalization graphene trielement composite material are made annealing treatment, to obtain
Obtain noble metal, metal oxide and functionalization graphene trielement composite material.
Further, the reaction condition of the metal hydroxides and graphene oxide composite material is：Add in oil bath
Heat stirs 2-18h to 30-120 DEG C.
Further, the reaction condition of the noble metal, metal hydroxides and functionalization graphene trielement composite material
For：Reacted in microwave, wherein, the power of the microwave is 450-900W, and the reaction time is 30-180s.
Especially, present invention also offers a kind of gas sensor that low concentration formaldehyde is detected for room temperature, including：
Substrate；
At least two electrodes, it is formed at the surface of the substrate；With
Gas sensitive as any one of claim 1-4, it is applied in the surface of the substrate, and at least portion
Divide covering at least two electrode, to cause at least two electrode conduction；
Wherein, the gas sensor can detect the formaldehyde gas that concentration is ppb grades at room temperature.
Further, the choice of the substrates is one kind in pcb board, silicon base and ceramic bases.
Further, the electrode is formed by metal or alloy film preparation；
Wherein, the one kind of the metal in Pt, Au, Ag, Cu, Al, Ni and W, the alloy firm be selected from Ni/Cr,
One kind in Mo/Mn, Cu/Zn, Ag/Pd, Pt/Au and Fe/Co.
The gas sensor of the present invention belongs to semiconductor-type gas sensor, i.e. metal oxide sensor, and it is by gold
The detecting element that category oxide material is made.This sensor detects that the operation principle of gas is and gas interaction generation table
Face is adsorbed or redox reaction, is caused electrical conductivity or C-V characteristic that carrier moving is characterized or surface potential change and is entered
Row gas concentration measurement.
The solution of the present invention, inventor probes into middle find noble metal, metal oxide and functionalization by many experiments
Graphene trielement composite material or noble metal, metal hydroxides and functionalization graphene trielement composite material are used as formaldehyde air-sensitive
It is Pt-NiO-RGO trielement composite materials or Pt-Ni (OH) especially in gas sensitive during material2- RGO trielement composite materials
When, unexpected technique effect is more that of obtaining, ppb grades of formaldehyde gas, and spirit are able to detect that at ambient temperature
Sensitivity is very high.This breaches conventional metal oxides as high-temperature work environment during gas sensitive completely, realizes room temperature
Detect the purpose of formaldehyde gas.Also, noble metal can be the noble metal nanometer materials such as nano particle or nano wire in the present invention,
And existing nano material all only rests on the experimental stage as gas sensitive, and low concentration can not be detected at room temperature
Formaldehyde gas, the present invention in gas sensitive can really apply in practical experience of life to detect the first of low concentration at room temperature
Aldehyde gas.
By lot of experiment validation, when noble metal is Pt, Au or Pd metal, and metal oxide is nickel oxide, iron
When oxide, cobalt/cobalt oxide, Mn oxide or tin-oxide, the gas sensitive obtains unexpected technique effect, i.e., in room
Temperature is lower can delicately to detect the formaldehyde of low concentration very much, and stability is very good.It is Pt- especially in the gas sensitive
NiO-RGO trielement composite materials, and NiO and Pt mol ratio is 0.6-0.8, and RGO quality is NiO and Pt quality sums
During 20-30%, the gas sensitive is even more to obtain unexpected technique effect, and the formaldehyde for detecting low concentration, sensitivity is non-
Chang Gao, can replace of the prior art needs the gas sensitive of hot operation completely.In addition, being Pt-Ni in the gas sensitive
(OH)2- RGO trielement composite materials, and Ni (OH)2Mol ratio with Pt is 0.5-1, and RGO quality is Ni (OH)2With Pt matter
When measuring the 25-28% of sum, the gas sensitive is equally to obtain unexpected technique effect, the first for detecting low concentration
Aldehyde, sensitivity is very high.And when above-mentioned gas sensitive is applied on gas sensor, due to being that gas sensitive is made into nanometer
Ink, is dropped on electrode, and consumption is considerably less so that the amount for the gas sensitive that each sensor is used is considerably less, and cost is relatively low.
In addition, the operating temperature of the formaldehyde gas sensor in existing metal oxide sensor technology is high temperature, therefore,
The base material of formaldehyde gas sensor of the prior art can not select pcb board, and can only select resistant to elevated temperatures substrate, for example
Silicon base or ceramic bases.Because the operating temperature of the formaldehyde gas sensor in the present invention can be normal temperature, therefore, the sensing
The base material of device can be selected as pcb board, and the cost of pcb board is substantially less than silicon base or ceramic bases.
Therefore, compared with traditional metal oxide gas sensitive, gas sensitive of the invention and the gas sensitive is included
Formaldehyde gas sensor, it does not need high-temperature work environment, greatly reduces power consumption, saves resource, passes formaldehyde gas
Sensor application field is more extensive.Also, the material needed on each sensor substrate is less, therefore the cost of material is relatively
It is low, the industrialized implementation of formaldehyde gas sensor can be conducive to.
According to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will be brighter
Above-mentioned and other purposes, the advantages and features of the present invention.
Brief description of the drawings
Some specific embodiments of the present invention are described in detail by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference denotes same or similar part or part in accompanying drawing.It should be appreciated by those skilled in the art that these
What accompanying drawing was not necessarily drawn to scale.In accompanying drawing：
Fig. 1 is that the structure of the gas sensor according to an embodiment of the invention that low concentration formaldehyde is detected for room temperature is shown
It is intended to；
Fig. 2 is that the room temperature according to an embodiment of the invention that is used for detects the gas sensor of low concentration formaldehyde at room temperature
Detect the test chart of formaldehyde gas；
Fig. 3 is the gas sensor in accordance with another embodiment of the present invention for room temperature detection low concentration formaldehyde in room temperature
The test chart of lower detection formaldehyde gas；
When Fig. 4 is that gas sensitive in existing metal-oxide gas transducer technology is applied on gas sensor
The test chart of formaldehyde gas is detected at room temperature.
Embodiment
One embodiment of the invention provides a kind of gas sensitive 130 that low concentration formaldehyde is detected for room temperature, the air-sensitive
Material 130 is：Noble metal, metal oxide and functionalization graphene trielement composite material, wherein, the metal oxide and your gold
The mol ratio of category is 0.2-5, and the quality of the functionalization graphene is the 15-50% of metal oxide and noble metal quality sum.
The noble metal is Pt, Au or Pd metal, and the metal oxide is nickel oxide, ferriferous oxide, cobalt/cobalt oxide, Mn oxide or tin
Oxide.
In a preferred embodiment, the gas sensitive 130 be Pt-NiO-RGO trielement composite materials, wherein, NiO and
Pt mol ratio is 0.6-0.8, and RGO quality is the 20-30% of NiO and Pt quality sums.In a further preferred reality
Apply in example, the quality that NiO and Pt mol ratio are 0.7, RGO is the 26% of NiO and Pt quality sums.In other embodiments,
NiO and Pt molar ratio such as can also for 0.6,0.65,0.75 or 0.8, RGO quality can also be NiO and Pt mass it
20%, 23%, 25%, 28% or the 30% of sum.Wherein, RGO is the english abbreviation of redox graphene.Wherein, Pt metals
Can be Pt nano particles or Pt nano wires.
The solution of the present invention, inventor probes into middle find noble metal, metal oxide and functionalization by many experiments
It is especially multiple for Pt-NiO-RGO ternarys in gas sensitive 130 when graphene trielement composite material is as formaldehyde gas sensitive material 130
During condensation material, unexpected technique effect is more that of obtaining, ppb grades of formaldehyde gas is able to detect that at ambient temperature,
And sensitivity is very high.This breaches conventional metal oxides as high-temperature work environment during gas sensitive 130 completely, real
Room temperature detection formaldehyde gas is showed.
Correspondingly, one embodiment of the invention additionally provides a kind of for preparing above-mentioned room temperature detection low concentration formaldehyde
The method of gas sensitive 130, comprises the following steps：
S100, offer graphene oxide powder；
It is S200, the graphene powder is scattered in organic solvent, and add metal salt solution and hydroxide ion type
Alkali obtains metal hydroxides and graphene oxide composite material to be reacted；
It is S300, the metal hydroxides and graphene oxide composite material is scattered in organic solvent, and your gold added
Category precursor solution and reducing agent obtain noble metal, metal hydroxides and functionalization graphene tri compound to be reacted
Material；With
S400, the noble metal, metal hydroxides and functionalization graphene trielement composite material made annealing treatment, with
Obtain above-mentioned noble metal, metal oxide and functionalization graphene trielement composite material.
In above-mentioned steps S100, graphene oxide (Graphene Oxide, GO) powder can be purchase, can also
It is to be prepared from by method known to Staudenmaier, Hummer or Brodie etc..
In a preferred embodiment, comprise the following steps in above-mentioned steps S200：
S210, the graphene powder is dispersed in DMF (N, N-dimethylformamide, DMF)
In organic solvent；
S220, a certain amount of nickel acetate of addition and ammoniacal liquor；
S230, the oil bath at 85 DEG C, and 15h is stirred, obtain Ni (OH)2- RGO materials.
Above-mentioned steps S300 comprises the following steps：
S310, by Ni (OH)2- RGO materials are dispersed in DMF organic solvents；
S320, a certain amount of chloroplatinic acid of addition and reducing agent；
S330, microwave reaction 90s, wherein, the power of microwave is 600W.
In other embodiments, the oil bath temperature in step S230 can be 30 °, 50 °, 70 °, 90 ° or 120 °, during stirring
Between can be 2h, 5h, 13h, 16h or 18h.
Microwave reaction 30s, 60s, 100s, 140s or 180s in step S330, the power of microwave is 450W, 500W,
700W or 900W.
One embodiment of the invention provides a kind of gas sensor that low concentration formaldehyde is detected for room temperature, and it includes
The Pt-NiO-RGO trielement composite materials stated.The gas sensor also includes the electrode 120 of substrate 110 and at least two.This is at least
Two electrodes 120 are formed at the surface in substrate 110.The gas sensitive 130 is applied in the surface of substrate 110, and at least portion
Divide covering at least two electrodes 120, to cause at least two electrodes 120 to turn on.In one embodiment, the gas sensor can
With including two electrodes 120.Turned between two electrodes 120 by the gas sensitive 130.The electrode 120 is by metal or conjunction
Gold thin film is made.Wherein, the metal can be Pt, Au, Ag, Cu, Al, Ni or W, the alloy firm can for Ni/Cr, Mo/Mn,
Cu/Zn, Ag/Pd, Pt/Au or Fe/Co.In one embodiment, a nanometer ink is made in the gas sensitive 130, and is dripped
To be prepared into gas sensor in substrate 110.
Fig. 2 shows to apply Pt-NiO-RGO trielement composite materials to be used to detect formaldehyde in room temperature in gas sensor
The test chart of gas.As shown in Fig. 2 Pt-NiO-RGO trielement composite materials can detect 0.2ppm formaldehyde gas at room temperature
Body, thus illustrates that the material can detect ppb grades of formaldehyde gas at room temperature.Being calculated according to the formula of sensitivity to obtain
Sensitivity is 1.9% during 0.2ppm.Thus illustrate that the material detects that the sensitivity of formaldehyde is higher at room temperature.
Another embodiment of the present invention provides a kind of gas sensitive 130 that low concentration formaldehyde is detected for room temperature, the gas
Quick material 130 is：Noble metal, metal hydroxides and functionalization graphene trielement composite material, wherein, the metal hydroxides
Mol ratio with the noble metal is 0.2-5, and the quality of the functionalization graphene is metal hydroxides and noble metal quality sum
15-50%.The noble metal is Pt, Au or Pd metal, and the metal hydroxides is nickel hydroxide, iron hydroxide, cobalt hydrogen
Oxide, manganese hydroxide or tin hydroxide.
In a preferred embodiment, the gas sensitive 130 is Pt-Ni (OH)2- RGO trielement composite materials, wherein,
Ni(OH)2Mol ratio with Pt is 0.5-1, and RGO quality is Ni (OH)2With the 25-28% of Pt quality sums.Enter one at one
Walk in preferred embodiment, Ni (OH)2The quality that mol ratio with Pt is 0.6, RGO is Ni (OH)2With Pt quality sums
27%.In other embodiments, Ni (OH)2Molar ratio with Pt can also be such as 0.5,0.65,0.75 or 0.8, RGO matter
Amount can also be Ni (OH)225%, 26% or 28% with Pt quality sums.
Correspondingly, one embodiment of the invention additionally provides a kind of for preparing above-mentioned room temperature detection low concentration formaldehyde
The method of gas sensitive 130, comprises the following steps：
S100 ', offer graphene oxide powder；
It is S200 ', the graphene powder is scattered in organic solvent, and add metal salt solution and hydroxide ion type
Alkali obtains metal hydroxides and graphene oxide composite material to be reacted；
It is S300 ', the metal hydroxides and graphene oxide composite material is scattered in organic solvent, and your gold added
Category precursor solution and reducing agent obtain noble metal, metal hydroxides and functionalization graphene tri compound to be reacted
Material.
In above-mentioned steps S100 ', graphene oxide powder can be purchase or pass through
Method known to Staudenmaier, Hummer or Brodie etc. is prepared from.
In a preferred embodiment, comprise the following steps in above-mentioned steps S200 '：
S210 ', the graphene powder is dispersed in DMF organic solvents；
S220 ', a certain amount of nickel acetate of addition and ammoniacal liquor；
S230 ', the oil bath at 85 DEG C, and 15h is stirred, obtain Ni (OH)2- RGO materials.
Above-mentioned steps S300 comprises the following steps：
S310 ', by Ni (OH)2- RGO materials are dispersed in DMF organic solvents；
S320 ', a certain amount of chloroplatinic acid of addition and reducing agent；
S330 ', microwave reaction 90s, wherein, the power of microwave is 600W.
In other embodiments, the oil bath temperature in step S230 ' can be 30 °, 50 °, 70 °, 90 ° or 120 °, stirring
Time can be 2h, 5h, 13h, 16h or 18h.
Microwave reaction 30s, 60s, 100s, 140s or 180s in step S330 ', the power of microwave is 450W, 500W,
700W or 900W.
Another embodiment of the present invention provides a kind of gas sensor that low concentration formaldehyde is detected for room temperature, and it includes
Above-mentioned Pt-Ni (OH)2- RGO trielement composite materials.The gas sensor also includes the electrode 120 of substrate 110 and at least two.
At least two electrode 120 is formed at the surface in substrate 110.The gas sensitive 130 is applied in the surface of substrate 110, and
At least two electrodes 120 are at least partly covered, to cause at least two electrodes 120 to turn on.In one embodiment, the air-sensitive is passed
Sensor can include two electrodes 120.Turned between two electrodes 120 by the gas sensitive 130.The electrode 120 is by gold
Category or alloy firm are made.Wherein, the metal can be Pt, Au, Ag, Cu, Al, Ni or W, the alloy firm can for Ni/Cr,
Mo/Mn, Cu/Zn, Ag/Pd, Pt/Au or Fe/Co.
Fig. 3 is shown Pt-Ni (OH)2- RGO trielement composite materials, which are applied, to be used in gas sensor in room temperature detection
The test chart of formaldehyde gas.As shown in figure 3, Pt-Ni (OH)2- RGO trielement composite materials can detect 0.5ppm's at room temperature
Formaldehyde gas, thus illustrates that the material can detect ppb grades of formaldehyde gas at room temperature.Being calculated according to the formula of sensitivity can
To obtain during 0.5ppm sensitivity as 0.1%.Thus illustrate that the material detects that the sensitivity of formaldehyde is higher at room temperature.However,
Compared with when Pt-NiO-RGO trielement composite materials are applied on gas sensor, Pt-Ni (OH)2- RGO sensitivity slightly worse one
A bit.Reason is, it is unannealed before, the resistance of material is about Ni (OH) after several K, annealing2Material becomes NiO materials, and resistance increases
Plus, the lower limit of test formaldehyde is increased with sensitivity.
In order to be contrasted, the present invention has been contrast experiment, gas sensitive selection commonly use in the prior art and sensitivity compared with
High Pd-SnO2Material, the formaldehyde gas of various concentrations is detected with the material at room temperature.Fig. 4 shows above-mentioned prior art
In gas sensitive apply the test chart for detecting formaldehyde gas when on gas sensor at room temperature, illustrated therein is different dense
Spend the test schematic diagram of formaldehyde gas response.As shown in figure 4, gas sensor of the prior art is in the concentration of formaldehyde gas
Do not responded to during 0.8ppm-3ppm, and the material declines always in detection base line, and resistance is very unstable.It follows that
Gas sensor of the prior art can not detect low concentration formaldehyde gas at normal temperatures.
So far, although those skilled in the art will appreciate that detailed herein have shown and described multiple showing for the present invention
Example property embodiment, still, still can be direct according to present disclosure without departing from the spirit and scope of the present invention
It is determined that or deriving many other variations or modifications for meeting the principle of the invention.Therefore, the scope of the present invention is understood that and recognized
It is set to and covers other all these variations or modifications.
Claims (10)
1. a kind of be used for the gas sensitive that room temperature detects low concentration formaldehyde, the gas sensitive is：
Noble metal, metal oxide and functionalization graphene trielement composite material, wherein, the metal oxide and your gold
The mol ratio of category is 0.2-5, and the quality of the functionalization graphene is the metal oxide and the noble metal quality sum
15-50%；Or
Noble metal, metal hydroxides and functionalization graphene trielement composite material, wherein, the metal hydroxides and described
The mol ratio of noble metal is 0.2-5, and the quality of the functionalization graphene is the metal hydroxides and the noble metal matter
Measure the 15-50% of sum；
Wherein, the gas sensitive can detect the formaldehyde gas that concentration is ppb grades at room temperature.
2. gas sensitive according to claim 1, wherein, the noble metal is Pt, Au or Pd metal；
Wherein, the metal oxide is nickel oxide, ferriferous oxide, cobalt/cobalt oxide, Mn oxide or tin-oxide.
3. gas sensitive according to claim 1 or 2, wherein, the gas sensitive is Pt-NiO-RGO tri compound materials
Material, wherein, NiO and Pt mol ratio are 0.6-0.8, and RGO quality is the 20-30% of NiO and Pt quality sums.
4. gas sensitive according to claim 1 or 2, wherein, the gas sensitive is Pt-Ni (OH)2- RGO tri compounds
Material, wherein, Ni (OH)2Mol ratio with Pt is 0.5-1, and RGO quality is Ni (OH)2With the 25-28% of Pt quality sums.
5. a kind of preparation method for the gas sensitive that low concentration formaldehyde is detected for room temperature, comprises the following steps：
Graphene oxide powder is provided；
The graphene powder is scattered in organic solvent, and add the alkali of metal salt solution and hydroxide ion type to carry out
Reaction, obtains metal hydroxides and graphene oxide composite material；
The metal hydroxides and graphene oxide composite material is scattered in organic solvent, and add noble metal precursor body
Solution and reducing agent obtain noble metal, metal hydroxides and functionalization graphene trielement composite material to be reacted；
Or also comprise the following steps：
The noble metal, metal hydroxides and functionalization graphene trielement composite material are made annealing treatment, it is expensive to obtain
Metal, metal oxide and functionalization graphene trielement composite material.
6. preparation method according to claim 5, wherein, the metal hydroxides and graphene oxide composite material
Reaction condition is：30-120 DEG C is heated in oil bath, and stirs 2-18h.
7. preparation method according to claim 6, wherein, the noble metal, metal hydroxides and functionalization graphene
The reaction condition of trielement composite material is：Reacted in microwave, wherein, the power of the microwave is 450-900W, reaction
Time is 30-180s.
8. a kind of gas sensor that low concentration formaldehyde is detected for room temperature, including：
Substrate；
At least two electrodes, it is formed at the surface of the substrate；With
Gas sensitive as any one of claim 1-4, it is applied in the surface of the substrate, and at least partly covers
At least two electrode is covered, to cause at least two electrode conduction；
Wherein, the gas sensor can detect the formaldehyde gas that concentration is ppb grades at room temperature.
9. gas sensor according to claim 8, wherein, the choice of the substrates is pcb board, silicon base and ceramic bases
In one kind.
10. gas sensor according to claim 9, wherein, the electrode is formed by metal or alloy film preparation；
Wherein, the one kind of the metal in Pt, Au, Ag, Cu, Al, Ni and W, the alloy firm is selected from Ni/Cr, Mo/
One kind in Mn, Cu/Zn, Ag/Pd, Pt/Au and Fe/Co.
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| CN107860794A (en) * | 2017-11-06 | 2018-03-30 | 余帝乾 | A kind of gas sensor encapsulating structure |
| CN107879381A (en) * | 2017-11-07 | 2018-04-06 | 上海纳米技术及应用国家工程研究中心有限公司 | Preparation method of the monatomic modification NiO nano materials of Sn for formaldehyde sensor and products thereof and application |
| CN107884443A (en) * | 2017-11-06 | 2018-04-06 | 余帝乾 | A kind of gas sensor |
| CN108318510A (en) * | 2018-01-09 | 2018-07-24 | 山东大学 | A kind of platinum/tin oxide nano particles cluster gas sensor and preparation method thereof of redox graphene package |
| CN108732207A (en) * | 2018-04-17 | 2018-11-02 | 上海理工大学 | A kind of sensitive material used in formaldehyde examination and preparation method and application |
| CN110412085A (en) * | 2019-07-17 | 2019-11-05 | 济南大学 | A kind of formaldehyde sensor gas sensitive and its sensor and preparation method, application |
| CN111781152A (en) * | 2020-07-10 | 2020-10-16 | 德州学院 | Graphene-sensitized optical fiber lactic acid sensor and preparation method thereof |
| CN115057437A (en) * | 2022-05-30 | 2022-09-16 | 苏州大学 | SnO (stannic oxide) 2 /NiO/graphene ternary composite material and preparation method and application thereof |
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| CN108732207B (en) * | 2018-04-17 | 2020-03-20 | 上海理工大学 | Sensitive material for formaldehyde detection and preparation method and application thereof |
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| CN111781152B (en) * | 2020-07-10 | 2021-05-11 | 德州学院 | Graphene-sensitized optical fiber lactic acid sensor and preparation method thereof |
| CN115057437A (en) * | 2022-05-30 | 2022-09-16 | 苏州大学 | SnO (stannic oxide) 2 /NiO/graphene ternary composite material and preparation method and application thereof |
| CN115057437B (en) * | 2022-05-30 | 2023-11-24 | 苏州大学 | SnO (tin oxide) 2 NiO/graphene ternary composite material and preparation method and application thereof |
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