CN109374688A - Gas detection method, equipment and graphene gas sensor based on graphene - Google Patents
Gas detection method, equipment and graphene gas sensor based on graphene Download PDFInfo
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- CN109374688A CN109374688A CN201811436446.3A CN201811436446A CN109374688A CN 109374688 A CN109374688 A CN 109374688A CN 201811436446 A CN201811436446 A CN 201811436446A CN 109374688 A CN109374688 A CN 109374688A
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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
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/125—Composition of the body, e.g. the composition of its sensitive layer
- G01N27/127—Composition of the body, e.g. the composition of its sensitive layer comprising nanoparticles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
Abstract
The invention discloses a kind of gas detection method based on graphene, equipment and graphene gas sensors, this method comprises: graphene gas sensor detects the under test gas in itself local environment, the electric signal for characterizing under test gas concentration is exported；Microprocessor is scaled under test gas concentration value based on the corresponding relationship between gas concentration value and value of electrical signals, by the corresponding value of electrical signals of electric signal for being used to characterize under test gas concentration exported.In this way, the present invention can effectively avoid being easy existing for electrochemical sensor to be influenced by electrolyte and other physical environments on the market now, irreversible chemical reaction easily occurs, the problems such as stability is poor.Stablize moreover, carrying out VOCs detection using graphene gas sensor and realizing monitoring, high sensitivity, accuracy is high, and structure is simple, and manufacturing cost is low, convenient for integrated advantage.
Description
Technical field
The present invention relates to gas detection technology more particularly to a kind of gas detection methods based on graphene, equipment and stone
Black alkene gas sensor.
Background technique
Volatile organic matter (VOCs, Volatile Organic Compounds) includes except carbon monoxide, titanium dioxide
It is photochemically reactive in any participation atmosphere other than carbon, carbonic acid, metal carbides, carbonate and ammonium carbonate to contain carbon compound
Object.The pollution source of VOCs is very wide in the modern life, such as the work that outdoor main source has fuel combustion and communications and transportation to generate
Industry exhaust gas tail gas etc.；Indoor main source has domestic fuel, building decoration materials, furniture appliance, cleaning, fibrous material etc..
Largely belong to toxic compounds in VOCs, may cause slow poisoning, damage liver, nervous system and mucosal secretions system
Deng；Part is serious carcinogenesis, especially causes serious damage to infants and children, is extremely easy to induce leukaemia etc..
Therefore, VOCs detection is particularly important.At present VOCs detection generally use electrochemical sensor (such as resistance, electric current, impedance,
Current potential etc.), optics sensor (such as spectral absorption type, fluorescence) and semiconductor-type gas sensor.
It usually has following defects that 1) however, carrying out VOCs detection using electrochemical sensor because by humidity, coexisting
The case where interfering substance influences can not obtain accurate data in low concentration measurement, it is necessary to periodic maintenance calibration；2) electric after use
Xie Zhihui is gradually decreased, and is declined for a long time using the stability that will cause instrument；3) measurement range and resolution ratio are mutually exclusive, no
It can meet simultaneously；4) it is only applicable to detect most of inorganic gas and fraction small organic molecule gas.Equally, using semiconductor
Type gas sensor carries out VOCs detection, and there is also obvious shortcomings: 1) stability is poor, affected by environment larger, is not suitable for accurate survey
Amount；2) a variety of reducibility gas can simultaneously interfere detection, poor selectivity.
Summary of the invention
The embodiment of the present invention creatively provides a kind of gas inspection based on graphene to guarantee effective detection of VOCs
Survey method, equipment and graphene gas sensor.
According to a first aspect of the embodiments of the present invention, a kind of gas detection method based on graphene, the method are provided
Include: that graphene gas sensor detects the under test gas in itself local environment, exports for characterizing under test gas
The electric signal of concentration；Microprocessor is used for table based on the corresponding relationship between gas concentration value and value of electrical signals, by what is exported
The corresponding value of electrical signals of electric signal of sign under test gas concentration is scaled under test gas concentration value.
According to an embodiment of the present invention, in microprocessor based on the corresponding pass between gas concentration value and value of electrical signals
System, by the corresponding value of electrical signals of electric signal for being used to characterize under test gas concentration exported be scaled under test gas concentration value it
Before, the method also includes: amplifying circuit is to the electric signal for characterizing under test gas concentration exported according to special ratios
It amplifies.
According to an embodiment of the present invention, the method further includes: wireless transport module will convert to
It surveys gas concentration value and is transmitted to external equipment.
According to an embodiment of the present invention, the graphene gas sensor includes flexible base and is located at the flexible base
The Graphene electrodes material on seat upper layer；The graphene gas sensor examines the under test gas in itself local environment
It surveys, exports the electric signal for characterizing under test gas concentration, comprising: when the graphene gas sensor is placed in gaseous environment
When, change in resistance is caused after the Graphene electrodes material surface adsorption gas molecule, and then export dense for characterizing gas
The electric signal of degree.
According to a second aspect of the embodiments of the present invention, a kind of gas detection equipment based on graphene is also provided, it is described to set
Standby includes: graphene gas sensor, for being detected to the under test gas in itself local environment, output for characterize to
Survey the electric signal of gas concentration；Microprocessor, it is for based on the corresponding relationship between gas concentration value and value of electrical signals, institute is defeated
The corresponding value of electrical signals of electric signal for characterizing under test gas concentration out is scaled under test gas concentration value.
According to an embodiment of the present invention, the equipment further include: amplifying circuit is dense for being based on gas in microprocessor
Corresponding relationship between angle value and value of electrical signals, the corresponding telecommunications of electric signal for being used to characterize under test gas concentration that will be exported
Number value is scaled before under test gas concentration value, to the electric signal for characterizing under test gas concentration exported according to specific ratio
Example amplifies.
According to an embodiment of the present invention, the equipment further include: wireless transport module, for will convert to
It surveys gas concentration value and is transmitted to external equipment.
According to a third aspect of the embodiments of the present invention, and a kind of graphene gas sensor, the graphene gas are provided
Sensor includes: flexible substrates；Graphene electrodes material positioned at the flexible substrates upper layer；Wherein, when the graphene gas
When body sensor is placed in gaseous environment, cause change in resistance after the Graphene electrodes material surface adsorption gas molecule, into
And export the electric signal for characterizing gas concentration.
According to an embodiment of the present invention, the Graphene electrodes material includes at least one of following material: graphene, three
Tie up graphene, graphene oxide, nitrogen-doped graphene, Fluorin doped graphene.
According to an embodiment of the present invention, the Graphene electrodes material is the graphene after metal-modified；Wherein, described
Metal includes at least one following metal material: Pd, Pt, Ag, Au, Cu, Co, Fe, Ni.
Gas detection method, equipment and graphene gas sensor of the embodiment of the present invention based on graphene, pass through graphite
Alkene gas sensor detects the under test gas in itself local environment, exports the telecommunications for characterizing under test gas concentration
Number；And then it is used to characterize by what is exported based on the corresponding relationship between gas concentration value and value of electrical signals by microprocessor
The corresponding value of electrical signals of the electric signal of under test gas concentration is scaled under test gas concentration value.In this way, the present invention can effectively be kept away
Exempt to be easy to be influenced by electrolyte and other physical environments existing for present electrochemical sensor on the market, easily occur irreversible
The problems such as chemical reaction, stability is poor.Stablize moreover, carrying out VOCs detection using graphene gas sensor and realizing monitoring,
High sensitivity, accuracy is high, and structure is simple, and manufacturing cost is low, convenient for integrated advantage.
It is to be appreciated that the teachings of the present invention does not need to realize whole beneficial effects recited above, but it is specific
Technical solution may be implemented specific technical effect, and other embodiments of the invention can also be realized and not mentioned above
Beneficial effect.
Detailed description of the invention
The following detailed description is read with reference to the accompanying drawings, above-mentioned and other mesh of exemplary embodiment of the invention
, feature and advantage will become prone to understand.In the accompanying drawings, if showing by way of example rather than limitation of the invention
Dry embodiment, in which:
In the accompanying drawings, identical or corresponding label indicates identical or corresponding part.
Fig. 1 shows the composed structure schematic diagram of graphene gas sensor of the embodiment of the present invention；
The implementation process schematic diagram of gas detection method Fig. 2 shows the embodiment of the present invention based on graphene；
Fig. 3 shows the present invention one and applies exemplary VOC gas testing principle flow diagram；
Fig. 4 shows the composed structure schematic diagram of gas detection equipment of the embodiment of the present invention based on graphene.
Specific embodiment
The principle and spirit of the invention are described below with reference to several illustrative embodiments.It should be appreciated that providing this
A little embodiments are only to be to make those skilled in the art can better understand that realize the present invention in turn, and not with any side
Formula limits the scope of the invention.On the contrary, it is of the invention more thorough and complete to make for providing these embodiments, and it can incite somebody to action this
The range of invention is completely communicated to those skilled in the art.
The technical solution of the present invention is further elaborated in the following with reference to the drawings and specific embodiments.
Fig. 1 shows the composed structure schematic diagram of graphene gas sensor of the embodiment of the present invention.
With reference to Fig. 1, graphene of embodiment of the present invention gas sensor 10 is layer structure, mainly includes flexible substrates 101
With the Graphene electrodes material 102 for being located at 101 upper layer of flexible substrates.Wherein, when graphene gas sensor is placed in gaseous environment
When, change in resistance is caused after Graphene electrodes material surface adsorption gas molecule, and then export for characterizing gas concentration
Electric signal.
Here, in the manufacturing process of graphene gas sensor 10, Graphene electrodes material 102 can be used into silk screen
The mode of printing or blade coating is integrated to be attached in flexible substrates 101.Wherein, flexible substrates 101 can for polyimides (PI) or
Polyester (PET) flexible material；Graphene electrodes material 102 can be graphene, three-dimensional grapheme, graphene oxide, N doping
Graphene, Fluorin doped graphene etc..
In practical applications, Graphene electrodes material 102 is usually the graphene after metal-modified, i.e., on the surface of graphene
Adsorb depositing metallic nanoparticles.Wherein, metal can be generally Pd, Pt, Ag, Au, Cu, Co, Fe, Ni etc..
Here, due to the characteristics such as the unique electronic structure of graphene and large specific surface area, 102 surface of Graphene electrodes material
After adsorption gas molecule, the change in resistance of itself can be caused, and then be converted to output electric signal, to realize gas detection；
Further, the graphene after metal-modified, corresponding different VOCs can generate different resistivity, therefore can be a variety of
Tested gas is more sensitively responded in the environment of gas coexistence.The embodiment of the present invention exactly makes full use of the unique electricity of graphene
The characteristics such as minor structure and large specific surface area, to provide a kind of gas detection method based on graphene.
The implementation process schematic diagram of gas detection method Fig. 2 shows the embodiment of the present invention based on graphene.Such as Fig. 2 institute
Show, which comprises operation 201: graphene gas sensor detects the under test gas in itself local environment, defeated
Out for characterizing the electric signal of under test gas concentration；Operation 202: microprocessor is based between gas concentration value and value of electrical signals
It is dense to be scaled under test gas by corresponding relationship for the corresponding value of electrical signals of electric signal for being used to characterize under test gas concentration exported
Angle value.
Wherein, the corresponding relationship between gas concentration value and value of electrical signals may include linear relationship, exponential relationship, or
The combination of the mathematical relationship or a variety of mathematical relationships of any other possibility form.
In operation 201, graphene gas sensor is placed under test gas environment, causes itself electricity after adsorbing under test gas
The variation of resistance rate, i.e. resistance variations, to export the electric signal after variation.
In conjunction with as shown in Figure 3 using exemplary VOC gas testing principle flow diagram, in operation 202, to export electricity
Signal be voltage for, according to graphene gas sensor lot of experimental data handle, find gas with various concentration value c and
The linear relationship f (c) of output voltage values u=ku, k are coefficient.In this way, microprocessor can be based on gas concentration value and electric signal
Linear relationship between value, by the corresponding value of electrical signals of electric signal for being used to characterize under test gas concentration exported be scaled to
Survey gas concentration value.
Gas detection method of the embodiment of the present invention based on graphene, by graphene gas sensor to ring locating for itself
Under test gas in border is detected, and the electric signal for characterizing under test gas concentration is exported；And then it is based on by microprocessor
Corresponding relationship between gas concentration value and value of electrical signals, the electric signal for being used to characterize under test gas concentration exported is corresponding
Value of electrical signals be scaled under test gas concentration value.In this way, the present invention can effectively avoid now electrochemical sensor on the market
It is existing to be easy to be influenced by electrolyte and other physical environments, irreversible chemical reaction easily occurs, the problems such as stability is poor.
Stablize moreover, carrying out VOCs detection using graphene gas sensor and realizing monitoring, high sensitivity, accuracy is high, structure letter
Single, manufacturing cost is low, convenient for integrated advantage.
In a possible embodiment, due to causing certainly after operation 201, graphene gas sensor absorption under test gas
Body change in resistance is smaller, therefore the electric signal exported is faint, is not easy to subsequent conversion processing.It therefore, can be in advance by putting
Big circuit carries out the enhanced processing of feature ratio to output electric signal, thus the measurement range of lift gas detection process.
In a possible embodiment, after operation 202, it will further can be converted using wireless transport module
To under test gas concentration value be transmitted to external equipment.Wherein, those skilled in the art should know, wireless transport module is
WiFi transmission module, Zigbee transmission module, Bluetooth transmission module and radio frequency identification unit etc..In this way, energy of the present invention
It is enough to realize the gas concentration reading for intuitively showing that detection obtains on external terminal device.In this way, passing through wireless transmission skill
Art can be realized wireless remote real-time monitoring, preferably incorporate Internet of Things, realize wisdom life.
Based on the gas detection method described above based on graphene, the embodiment of the present invention also provides a kind of based on graphene
Gas detection equipment, comprising: one or more processor；Memory；The program of storage in the memory, when by institute
When stating the execution of one or more processor, described program makes the processor at least execute operating procedure as described below: right
Under test gas in graphene gas sensor local environment is detected, and the telecommunications for characterizing under test gas concentration is exported
Number；Based on the corresponding relationship between gas concentration value and value of electrical signals, the electricity for being used to characterize under test gas concentration that will be exported
The corresponding value of electrical signals of signal is scaled under test gas concentration value.
Equally, based on again based on the gas detection method of graphene, the embodiment of the present invention provides a kind of meter as described above
Calculation machine readable storage medium storing program for executing, the computer-readable recording medium storage have program, when said program is executed by a processor, make
It obtains the processor and at least executes operating procedure as described below: to the under test gas in graphene gas sensor local environment
It is detected, exports the electric signal for characterizing under test gas concentration；Based on corresponding between gas concentration value and value of electrical signals
The corresponding value of electrical signals of electric signal for being used to characterize under test gas concentration exported is scaled under test gas concentration by relationship
Value.
Further, based on the gas detection method described above based on graphene, the embodiment of the present invention also provides one kind
Gas detection equipment based on graphene, as shown in figure 4, the equipment 40 includes graphene gas sensor 401 and micro process
Device 402；Wherein, graphene gas sensor 401, for detecting to the under test gas in itself local environment, output is used
In the electric signal of characterization under test gas concentration；Microprocessor 402, for based on corresponding between gas concentration value and value of electrical signals
The corresponding value of electrical signals of electric signal for being used to characterize under test gas concentration exported is scaled under test gas concentration by relationship
Value.
According to an embodiment of the present invention, the equipment further includes amplifying circuit 403, for being based in microprocessor 401
Corresponding relationship between gas concentration value and value of electrical signals, the electric signal for being used to characterize under test gas concentration exported is corresponding
Value of electrical signals be scaled before under test gas concentration value, to the electric signal exported for characterizing under test gas concentration according to
Special ratios amplify.
According to an embodiment of the present invention, the equipment further includes wireless transport module 404, for will convert
Under test gas concentration value is transmitted to external equipment 50.
It will be understood by those skilled in the art that in practical applications, it usually can be by graphene gas sensor
401, microprocessor 402, amplifying circuit, wireless transport module 404 and power supply uniformly pass through integrated technique be placed in it is same soft
Property substrate on, to preferably incorporate Internet of Things, realize wisdom life.
It need to be noted that: the description of the gas detection equipment embodiment based on graphene above, with 2 institute of earlier figures
The description for the embodiment of the method shown be it is similar, there is the similar beneficial effect with aforementioned embodiment of the method shown in Fig. 2, therefore
It does not repeat them here.For undisclosed technical detail in the gas detection equipment embodiment the present invention is based on graphene, this is please referred to
It invents the description of aforementioned embodiment of the method shown in Fig. 2 and understands, to save length, therefore repeat no more.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
In several embodiments provided herein, it should be understood that disclosed device and method can pass through it
Its mode is realized.Apparatus embodiments described above are merely indicative, for example, the division of the unit, only
A kind of logical function partition, there may be another division manner in actual implementation, such as: multiple units or components can combine, or
It is desirably integrated into another system, or some features can be ignored or not executed.In addition, shown or discussed each composition portion
Mutual coupling or direct-coupling or communication connection is divided to can be through some interfaces, the INDIRECT COUPLING of equipment or unit
Or communication connection, it can be electrical, mechanical or other forms.
Above-mentioned unit as illustrated by the separation member, which can be or may not be, to be physically separated, aobvious as unit
The component shown can be or may not be physical unit；Both it can be located in one place, and may be distributed over multiple network lists
In member；Some or all of units can be selected to achieve the purpose of the solution of this embodiment according to the actual needs.
In addition, each functional unit in various embodiments of the present invention can be fully integrated in one processing unit, it can also
To be each unit individually as a unit, can also be integrated in one unit with two or more units；It is above-mentioned
Integrated unit both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can store in computer-readable storage medium, which exists
When execution, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: movable storage device, read-only deposits
The various media that can store program code such as reservoir (Read Only Memory, ROM), magnetic or disk.
If alternatively, the above-mentioned integrated unit of the present invention is realized in the form of software function module and as independent product
When selling or using, it also can store in a computer readable storage medium.Based on this understanding, the present invention is implemented
Substantially the part that contributes to existing technology can be embodied in the form of software products the technical solution of example in other words,
The computer software product is stored in a storage medium, including some instructions are used so that computer equipment (can be with
It is personal computer, server or network equipment etc.) execute all or part of each embodiment the method for the present invention.
And storage medium above-mentioned includes: various Jie that can store program code such as movable storage device, ROM, magnetic or disk
Matter.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of gas detection method based on graphene, which is characterized in that the described method includes:
Graphene gas sensor detects the under test gas in itself local environment, exports dense for characterizing under test gas
The electric signal of degree；
Microprocessor is used to characterize under test gas based on the corresponding relationship between gas concentration value and value of electrical signals by what is exported
The corresponding value of electrical signals of the electric signal of concentration is scaled under test gas concentration value.
2. the method according to claim 1, wherein microprocessor be based on gas concentration value and value of electrical signals it
Between corresponding relationship, the corresponding value of electrical signals of electric signal for being used to characterize under test gas concentration exported is scaled gas to be measured
Before bulk concentration value, the method also includes:
Amplifying circuit amplifies the electric signal for characterizing under test gas concentration exported according to special ratios.
3. the method according to claim 1, wherein the method further includes:
The under test gas concentration value to convert is transmitted to external equipment by wireless transport module.
4. method according to any one of claims 1 to 3, which is characterized in that the graphene gas sensor includes soft
Property pedestal and the Graphene electrodes material positioned at the flexible base upper layer；
The graphene gas sensor detects the under test gas in itself local environment, exports for characterizing gas to be measured
The electric signal of bulk concentration, comprising:
When the graphene gas sensor is placed in gaseous environment, after the Graphene electrodes material surface adsorption gas molecule
Cause change in resistance, and then exports the electric signal for characterizing gas concentration.
5. a kind of gas detection equipment based on graphene, which is characterized in that the equipment includes:
Graphene gas sensor exports to be measured for characterizing for detecting to the under test gas in itself local environment
The electric signal of gas concentration；
Microprocessor, for based on the corresponding relationship between gas concentration value and value of electrical signals, by exported be used to characterize to
The corresponding value of electrical signals of electric signal for surveying gas concentration is scaled under test gas concentration value.
6. equipment according to claim 5, which is characterized in that the equipment further include:
Amplifying circuit, in microprocessor based on the corresponding relationship between gas concentration value and value of electrical signals, by what is exported
The corresponding value of electrical signals of electric signal for characterizing under test gas concentration is scaled before under test gas concentration value, to what is exported
Electric signal for characterizing under test gas concentration is amplified according to special ratios.
7. equipment according to claim 5, which is characterized in that the equipment further include:
Wireless transport module, the under test gas concentration value for will convert are transmitted to external equipment.
8. a kind of graphene gas sensor, which is characterized in that the graphene gas sensor includes:
Flexible substrates；
Graphene electrodes material positioned at the flexible substrates upper layer；
Wherein, when the graphene gas sensor is placed in gaseous environment, the Graphene electrodes material surface adsorbed gas
Cause change in resistance after molecule, and then exports the electric signal for characterizing gas concentration.
9. graphene gas sensor according to claim 8, which is characterized in that the Graphene electrodes material at least wraps
Include one of following material: graphene, three-dimensional grapheme, graphene oxide, nitrogen-doped graphene, Fluorin doped graphene.
10. graphene gas sensor according to claim 8, which is characterized in that the Graphene electrodes material is gold
Graphene after belonging to modification；Wherein, the metal includes at least one following metal material: Pd, Pt, Ag, Au, Cu, Co, Fe,
Ni。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514788A (en) * | 2019-08-20 | 2019-11-29 | 上海畅制电子科技有限公司 | A kind of scaling method of gas sensor, device, equipment and storage medium |
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