CN108680610A - One kind being based on MoS2The room temperature NO of-PbS composite materials2Gas sensor and preparation method thereof - Google Patents
One kind being based on MoS2The room temperature NO of-PbS composite materials2Gas sensor and preparation method thereof Download PDFInfo
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Abstract
The invention discloses one kind being based on MoS2The room temperature NO of PbS composite materials2The preparation method of gas sensor, includes the following steps：Silver/palladium interdigital electrode is placed in aluminium oxide ceramics substrate and connects external pin；By MoS2PbS composite materials are dissolved in absolute ethyl alcohol, are then carried out ultrasonic disperse processing, so that solution is uniformly dispersed, obtain suspension；The suspension after being uniformly dispersed is drawn with rubber head dropper, 1 is then dripped and drops in silver/palladium interdigital electrode, then device is positioned in baking oven and is heated, is dropped in silver/palladium interdigital electrode with rubber head dropper drop 1 again after ethanol evaporation, repeated several times, obtains being based on MoS2The room temperature NO of PbS composite materials2Gas sensor.The present invention is prepared for MoS using simple hydro-thermal method combination chemical precipitation method2PbS composite materials, preparation process is simple, and reaction condition is low to required instrument requirements, simple for process, at low cost.
Description
Technical field
The present invention relates to a kind of semiconductor gas sensors, more particularly to a kind of to be based on MoS2The room temperature of-PbS composite materials
NO2Gas sensor and preparation method thereof.
Background technology
With the rapid development of modern industry, a large amount of toxic and harmful gas is discharged, ambient air quality problem is
As the extensive focus of people.NO2It is a kind of important pollutant influencing air quality, is mainly derived from emission from vehicles
And industrial waste gas.The NO of high concentration2It can cause a variety of environmental problems, it is one of the reason of causing PM2.5 atmosphere pollution, is shape
At the principal element of photochemical fog, while it being also one of the source of acid rain.When concentration is more than 200 μ g/m3(it is approximately equal to
When 0.1ppm), NO2Respiratory apparatus can be stimulated, toxic effect is caused, causes the breaking-out of bronchus disease type, seriously endangers people
Body health.Therefore, developing has highly selective, highly sensitive and low detection limits NO2Gas sensor is to realize in environment
NO2The efficient detection of gas has a very important significance.
Traditional semiconductor gas sensor mostly uses ZnO, SnO2Equal simple metals oxide is sensitive material, these materials
It is widely applied although material has been obtained for comparing in gas sensor domain, there are still certain deficiencies, such as selectivity
It is poor, operating temperature is high etc..When detecting flammable explosive gas, it is hidden that higher operating temperature easily becomes a great safety
Suffer from, the significant consequences that object gas may be caused to burn or even explode, to limit the hair of this kind of semiconductor gas sensor
Exhibition.With MoS2Because of its unique layer structure and gas is divided for Transition-metal dichalcogenide (TMDs) two-dimensional material of representative
Sublist reveals good characterization of adsorption, it is made to show huge application prospect in room temperature air sensor field.With research
Go deep into, TMDs two-dimensional materials are easily aoxidized because of difficult desorption at room temperature, in air environment, reduce carrier concentration and load
Transport factor, the phenomenon for causing its performance unstable are flowed, so that TMDs gas sensors are special in response, response/recovery
There are still challenges for property and device stability etc..
Invention content
In order to solve the above technical problem, the present invention provides a kind of high sensitivity, fast response time based on MoS2-PbS
The room temperature NO of composite material2Gas sensor, and preparation method is provided.
Technical proposal that the invention solves the above-mentioned problems is：One kind being based on MoS2The room temperature NO of-PbS composite materials2Gas passes
Sensor, including aluminium oxide ceramics substrate；It is arranged in the several to silver/palladium interdigital electrode of aluminium oxide ceramics substrate；It is arranged in silver/palladium
External pin in interdigital electrode；Sensitive material of the drop coating in silver/palladium interdigital electrode；The sensitive material is MoS2- PbS is multiple
Condensation material.
It is above-mentioned to be based on MoS2The room temperature NO of-PbS composite materials2Gas sensor, the MoS2MoS in-PbS composite materials2
Mass ratio with PbS is 10:1.
It is above-mentioned to be based on MoS2The room temperature NO of-PbS composite materials2Gas sensor, the MoS2In-PbS composite materials
MoS2For two-dimentional MoS2Puffy near-spherical structure made of nanometer sheet self assembly, PbS are that MoS is attached in the form of quantum dot2
On, and the size of PbS quantum is between 5~20nm.
One kind being based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor, includes the following steps：
1) silver/palladium interdigital electrode is placed in aluminium oxide ceramics substrate and connects external pin；
2) by MoS2- PbS composite materials are dissolved in absolute ethyl alcohol, then carry out ultrasonic disperse processing, keep solution dispersion equal
It is even, obtain suspension；
3) with rubber head dropper aspiration step 2) in be uniformly dispersed after suspension, then drip and 1 drop to silver/palladium interdigital electrode
On, then device is positioned in baking oven and is heated, it is dropped in silver/palladium interdigital electrode with rubber head dropper drop 1 again after ethanol evaporation,
Repeated several times obtain being based on MoS2The room temperature NO of-PbS composite materials2Gas sensor.
It is above-mentioned to be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor, the MoS2- PbS is compound
The preparation method of material is as follows：
1. sodium molybdate and thioacetic acid ammonium are dissolved in deionized water, magnetic agitation carries out ultrasonic disperse to after being completely dissolved
Then processing is filtered one time with neutral filter paper；
2. filtered colourless transparent solution is transferred in polytetrafluoroethylliner liner, it is anti-that liner is then packed into stainless steel
It answers in kettle, and reaction kettle is sealed, be put into baking oven and heat reaction；
3. after reaction kettle natural cooling, suspension in kettle is taken out, operation is centrifuged, obtains black precipitate,
Then the black precipitate of gained cleaned, dried, obtain molybdenum disulfide powder；
4. weighing molybdenum disulfide powder is dissolved in absolute ethyl alcohol, and ultrasonic disperse is handled；It weighs plumbi nitras and is dissolved in ultrasound point
In molybdenum disulfide after dissipating, magnetic agitation carries out ultrasonic disperse processing to after being completely dissolved, and so that solution is uniformly dispersed, is mixed
Solution；
5. weighing Sodium Sulphate Nine Hydroxide to be dissolved in deionized water, magnetic agitation is carried out to after being completely dissolved at ultrasonic disperse
Reason, makes solution be uniformly dispersed, obtains sodium sulfide solution；Sodium sulfide solution is added in 4. mixed solution that step obtains, is carried out
Then operation is centrifuged in magnetic agitation, after centrifugation after the precipitation cleaning, drying of gained, obtain MoS2- PbS is multiple
Condensation material.
It is above-mentioned to be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor, MoS2- PbS composite materials
Preparation method the step of 1. in, the molar ratio of sodium molybdate and thioacetic acid ammonium is 2:5.
It is above-mentioned to be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor, MoS2- PbS composite materials
Preparation method the step of 2. in, heating temperature be 200 DEG C, heating time be 36 hours.
It is above-mentioned to be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor, MoS2- PbS composite materials
Preparation method the step of 3. in, the rotating speed of centrifugation is 2000 rpms, using deionized water and absolute ethyl alcohol to institute
The black precipitate obtained is cleaned, and drying temperature is 60 DEG C, and drying time is 12 hours.
It is above-mentioned to be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor, MoS2- PbS composite materials
Preparation method the step of 4. in, the mass ratio of the molybdenum disulfide and plumbi nitras that weigh is 10:1.38.
It is above-mentioned to be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor, MoS2- PbS composite materials
Preparation method the step of 5. in, the Sodium Sulphate Nine Hydroxide that weighs and step 4. in the mass ratio of molybdenum disulfide that weighs be 10:
1。
The beneficial effects of the present invention are：
1, the present invention utilizes PbS quantum to MoS2Modification is carried out to which MoS be made2- PbS composite materials, compared to single
MoS2Material, at room temperature to NO2The aspect of performance such as Selective recognition, response, response speed have greatly improved,
In to the NO of a concentration of 100ppm2Response has reached 29%, compared to single MoS2Material response value (0.43%) improves about 60
Times, response time 30s shortens 40%, while overcoming single MoS2Incomplete disadvantage is desorbed, it is right at room temperature to realize
NO2Accurate, efficient, quick, stable detection.
2, the present invention is prepared for MoS using simple hydro-thermal method combination chemical precipitation method2- PbS composite materials, preparation process
Simply, reaction condition is low to required instrument requirements；Using commercially available plane interdigital electrode substrate, sensing is fabricated to by drop-coating
Device, simple process and low cost.
Description of the drawings
Fig. 1 is air-sensitive test schematic diagram.
Fig. 2 is MoS in the embodiment of the present invention2The XRD diagram of-PbS composite materials.
Fig. 3 is MoS in the embodiment of the present invention2The SEM of-PbS composite materials schemes.
Fig. 4 is MoS in the embodiment of the present invention2The HRTEM of-PbS composite materials schemes.
Fig. 5 is the embodiment of the present invention and comparative example to various concentration NO2Response-recovery curve graph.
Fig. 6 be the embodiment of the present invention and comparative example at 25 DEG C to 100ppmNO2Response-recovery curve graph.
Fig. 7 is the selectivity characrerisitic figure of the embodiment of the present invention and comparative example to 100ppm gas with various.
Specific implementation mode
The present invention is further illustrated with reference to the accompanying drawings and examples.
One kind being based on MoS2The room temperature NO of-PbS composite materials2Gas sensor, including aluminium oxide ceramics substrate 1；Setting exists
5 pairs of silver/palladium interdigital electrode 2 of aluminium oxide ceramics substrate 1；External pin 3 in silver/palladium interdigital electrode 2 is set；Drop coating exists
Sensitive material in silver/palladium interdigital electrode 2；The sensitive material is MoS2- PbS composite materials.
Comparative example：
With MoS2Plane interdigitation gas sensor is made as sensitive material, specific manufacturing process is as follows：
1. weighing 0.194g sodium molybdates (0.8mmol) and 0.150g thioacetic acids ammonium (2mmol) being placed in beaker, it is added
60mL deionized waters are made it dissolve for 20 minutes using magnetic stirrer；By above solution ultrasonic disperse processing 5 minutes, so
It is filtered one time with neutral filter paper afterwards；
2. filtered colourless transparent solution is transferred in the polytetrafluoroethylliner liner that volume is 100mL, it then will be interior
Courage is fitted into stainless steel cauldron, and reaction kettle is sealed, and is put into baking oven, heating reaction 36 hours at 200 DEG C；
3. after reaction kettle natural cooling, suspension in kettle is taken out, is centrifuged under 2000 rpms of rotating speed,
The black precipitate of gained deionized water and absolute ethyl alcohol are respectively washed 2 times, after then being dried 12 hours at 60 DEG C, obtain two
Vulcanize molybdenum powder；
4. by 0.005gMoS2Material is mixed with 5mL absolute ethyl alcohols, and ultrasonic disperse is handled 20 minutes, keeps solution dispersion equal
It is even；Suspension rubber head dropper drop 1 after being uniformly dispersed drops in silver/palladium interdigital electrode, and device is then positioned over baking oven
In, it is heated at 60 DEG C, is dropped in silver/palladium interdigital electrode, be repeated 5 times with rubber head dropper drop 1 again after ethanol evaporation, to
It obtains being based on MoS2The gas sensor of sensitive material.
Embodiment：
With MoS2It is 10 with PbS mass ratioes：1 MoS2- PbS makes plane interdigitation gas sensor as sensitive material,
Its specific manufacturing process is as follows：
1. weighing 0.194g sodium molybdates (0.8mmol) and 0.150g thioacetic acids ammonium (2mmol) being placed in beaker, it is added
60mL deionized waters are made it dissolve for 20 minutes using magnetic stirrer；By above solution ultrasonic disperse processing 5 minutes, so
It is filtered one time with neutral filter paper afterwards；
2. filtered colourless transparent solution is transferred in the polytetrafluoroethylliner liner that volume is 100mL, it then will be interior
Courage is fitted into stainless steel cauldron, and reaction kettle is sealed, and is put into baking oven, heating reaction 36 hours at 200 DEG C；
3. after reaction kettle natural cooling, suspension in kettle is taken out, is centrifuged under 2000 rpms of rotating speed,
The black precipitate of gained deionized water and absolute ethyl alcohol are respectively washed 2 times, after then being dried 12 hours at 60 DEG C, obtain two
Vulcanize molybdenum powder；
4. weighing 0.1g, molybdenum disulfide powder obtained adds to 10mL absolute ethyl alcohols, and ultrasonic disperse is handled 20 minutes；
It weighs in the molybdenum disulfide after 0.0138g plumbi nitras is dissolved in ultrasonic disperse, uses magnetic stirrer 20 minutes, then ultrasound
Decentralized processing 25 minutes, makes solution be uniformly dispersed；
5. 0.01g Sodium Sulphate Nine Hydroxides are weighed to be dissolved in 10mL deionized waters, using magnetic stirrer 15 minutes,
Re-ultrasonic dispersion is handled 25 minutes, and solution is made to be uniformly dispersed；Sodium sulfide solution is added in the 4. mixed solution of step, magnetic is used
Power blender stirs 20 minutes, and final mixed solution is placed in supercentrifuge with 2000 rpms of rotating speed centrifugation point
From the precipitation deionized water and absolute ethyl alcohol of gained are respectively washed 2 times, then 12 hours dry at 60 DEG C, obtain MoS2-
PbS composite sensitive materials；
6. silver/palladium interdigital electrode is placed in aluminium oxide ceramics substrate and connects external pin
7. by 0.005gMoS2- PbS composite sensitive materials are mixed with 5mL absolute ethyl alcohols, and ultrasonic disperse is handled 20 minutes, is made
Solution is uniformly dispersed；
8. the suspension rubber head dropper drop 1 after being uniformly dispersed drops in silver/palladium interdigital electrode, then device is placed
At 60 DEG C of baking ovens, is dropped in silver/palladium interdigital electrode, be repeated 5 times with rubber head dropper drop 1 again after ethanol evaporation, to
To based on MoS2The room temperature NO of-PbS composite sensitive materials2Gas sensor.
As shown in Figure 1, carrying out distribution using vial, NO is acquired by air-sensitive tester2The resistance value of gas sensor becomes
Change, NO2Gas sensor is made of aluminium oxide ceramics substrate 1, silver/palladium interdigital electrode 2, external pin 3 and sensitive material.Such as figure
Shown in 1, the specific method is as follows for air-sensitive test：Sensor is put into air gas cylinder first, can just be sensed after its stabilization
Aerial resistance value, that is, the R of devicea；Then by the NO of 5ppm2It injects in gas tank, sensor is moved in gas tank, waits for that its resistance value is steady
Acquisition sensor is in NO after fixed2In resistance value Rg；Sensor is moved back in air gas cylinder again, the response for obtaining a cycle restores
Curve.The defined formula of value S according to response：Sensor is obtained by calculation to 5ppmNO2Response.
It repeats the above process, injects the NO of various concentration2, then the data measured are handled, so that it may it obtains embodiment and comparative example and passes
Sensor is to various concentration NO2Response-recovery curve.
As shown in Fig. 2, MoS2Characteristic peak in-PbS composite material XRD diagram and PbS standard cards (JCPDS05-0592)
And MoS2The characteristic peak of standard card (JCPDS 06-0097) is corresponding and without other miscellaneous peaks, illustrate in sample comprising PbS and
MoS2, no other impurities.
As shown in figure 3, MoS2MoS in-PbS composite materials2For two-dimentional MoS2Puffy class made of nanometer sheet self assembly
Chondritic, PbS are that MoS is attached in the form of quantum dot2On.
As shown in figure 4, can be seen that PbS is to disperse to be attached in the form of quantum dot in embodiment composite material by a
MoS2On, for the size of PbS quantum between 5~20nm, this is consistent with SEM shown above；It can be seen that by the HRTEM of b
There are two different lattice fringes, the lattice fringe spacing of 0.27nm belongs to MoS2Crystal face (100), the lattice item of 0.30nm
Line spacing is originated from the crystal face (200) of PbS, illustrates that PbS quantum is attached to MoS2Surface.
As shown in figure 5, in the NO of various concentration2Under atmosphere, embodiment MoS2- PbS composite materials are to a concentration of 5ppm's
NO2Response has reached 7.5%, to the NO of a concentration of 100ppm2Response has reached 29%, compared to comparative example response (comparative example
In single MoS2To 100ppm NO2Response be 0.43%) improve about 60 times, illustrate that the air-sensitive performance of embodiment has greatly
Promotion.
As shown in fig. 6, in 100ppmNO2Under atmosphere, embodiment MoS2The response time of-PbS composite materials is 30s, is restored
Time is 235s, and single MoS in comparative example2Response time be 50s, and because difficult desorption make its can not be fully returned to just
Beginning state illustrates using PbS quantum to MoS2It carries out modifying obtained MoS2- PbS composite sensitive materials, can speed up material
Expect the absorption to gas and desorption, significantly promotes the air-sensitive performance of material.
As shown in fig. 7, in comparative example one-component MoS2To the NO of 100ppm2、NH3、C3H6O、CH4O、CH2O、C2H6O
The response of gas is respectively 0.43%, 5.5%, 0.85%, 1.65%, 0.21%, 0.1%, embodiment MoS2- PbS is compound
Material is respectively 29%, 1.2%, 0.1%, 1.8%, 0.85%, 0.1% to the response of these gases.Definition selection characteristic
COEFFICIENT K, K=SE/SB, S in formulaEAnd SBRespectively gas sensor is to NO2With the response of comparison gas.It is single in comparative example
MoS2Selection characteristic coefficient K be respectively 0.08,0.5,0.26,2.05,4.3, illustrate single MoS in comparative example2To NO2Choosing
Selecting property is poor；Embodiment MoS2The selection characteristic coefficient K of-PbS composite materials is respectively 24.17,290,16.1,34.1,290, is said
Bright MoS2- PbS composite materials are to NO2There is excellent selection characteristic.
Claims (10)
1. one kind being based on MoS2The room temperature NO of-PbS composite materials2Gas sensor, including aluminium oxide ceramics substrate；It is arranged in oxygen
Change the several to silver/palladium interdigital electrode of aluminium ceramic bases；External pin in silver/palladium interdigital electrode is set；Drop coating is in silver/palladium
Sensitive material in interdigital electrode；It is characterized in that：The sensitive material is MoS2- PbS composite materials.
2. according to claim 1 be based on MoS2The room temperature NO of-PbS composite materials2Gas sensor, it is characterised in that：Institute
State MoS2MoS in-PbS composite materials2Mass ratio with PbS is 10:1.
3. according to claim 1 be based on MoS2The room temperature NO of-PbS composite materials2Gas sensor, it is characterised in that：Institute
State MoS2MoS in-PbS composite materials2For two-dimentional MoS2Puffy near-spherical structure made of nanometer sheet self assembly, PbS be with
The form of quantum dot is attached to MoS2On, and the size of PbS quantum is between 5~20nm.
4. a kind of according to any one of claim 1-3 based on MoS2The room temperature NO of-PbS composite materials2Gas sensor
Preparation method, include the following steps：
1) silver/palladium interdigital electrode is placed in aluminium oxide ceramics substrate and connects external pin；
2) by MoS2- PbS composite materials are dissolved in absolute ethyl alcohol, are then carried out ultrasonic disperse processing, so that solution is uniformly dispersed, obtain
To suspension；
3) with rubber head dropper aspiration step 2) in be uniformly dispersed after suspension, then drip and 1 drop in silver/palladium interdigital electrode, then
Device is positioned in baking oven and is heated, is dropped in silver/palladium interdigital electrode, is repeated with rubber head dropper drop 1 again after ethanol evaporation
Several times, it obtains being based on MoS2The room temperature NO of-PbS composite materials2Gas sensor.
5. according to claim 4 be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor,
It is characterized in that, the MoS2The preparation method of-PbS composite materials is as follows：
1. sodium molybdate and thioacetic acid ammonium are dissolved in deionized water, magnetic agitation is carried out to after being completely dissolved at ultrasonic disperse
Then reason is filtered one time with neutral filter paper；
2. filtered colourless transparent solution is transferred in polytetrafluoroethylliner liner, liner is then packed into stainless steel cauldron
In, and reaction kettle is sealed, it is put into baking oven and heats reaction；
3. after reaction kettle natural cooling, suspension in kettle is taken out, operation is centrifuged, obtains black precipitate, then
The black precipitate of gained is cleaned, is dried, molybdenum disulfide powder is obtained；
4. weighing molybdenum disulfide powder is dissolved in absolute ethyl alcohol, and ultrasonic disperse is handled；It weighs after plumbi nitras is dissolved in ultrasonic disperse
Molybdenum disulfide in, magnetic agitation carries out ultrasonic disperse processing to after being completely dissolved, and solution is made to be uniformly dispersed, and obtains mixing molten
Liquid；
5. weighing Sodium Sulphate Nine Hydroxide to be dissolved in deionized water, magnetic agitation carries out ultrasonic disperse processing to after being completely dissolved, and makes
Solution is uniformly dispersed, and obtains sodium sulfide solution；Sodium sulfide solution is added in 4. mixed solution that step obtains, carries out magnetic force and stir
It mixes, operation is then centrifuged, after centrifugation after the precipitation cleaning, drying of gained, obtain MoS2- PbS composite materials.
6. according to claim 5 be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor,
It is characterized in that, MoS2The step of preparation method of-PbS composite materials 1. in, the molar ratio of sodium molybdate and thioacetic acid ammonium is 2:
5。
7. according to claim 5 be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor,
It is characterized in that, MoS2The step of preparation method of-PbS composite materials 2. in, heating temperature is 200 DEG C, and heating time is 36 small
When.
8. according to claim 5 be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor,
It is characterized in that, MoS2The step of preparation method of-PbS composite materials 3. in, the rotating speed of centrifugation is 2000 rpms, is adopted
The black precipitate of gained is cleaned with deionized water and absolute ethyl alcohol, drying temperature is 60 DEG C, and drying time is 12 hours.
9. according to claim 5 be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor,
It is characterized in that, MoS2The step of preparation method of-PbS composite materials 4. in, the mass ratio of the molybdenum disulfide and plumbi nitras that weigh
It is 10:1.38.
10. according to claim 5 be based on MoS2The room temperature NO of-PbS composite materials2The preparation method of gas sensor,
It is characterized in that, MoS2The step of preparation method of-PbS composite materials 5. in, the Sodium Sulphate Nine Hydroxide that weighs and step 4. in claim
The mass ratio of the molybdenum disulfide taken is 10:1.
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| CN111398368A (en) * | 2020-04-30 | 2020-07-10 | 中国人民解放军陆军防化学院 | Nitrogen dioxide gas sensor based on molybdenum disulfide and preparation method |
| CN113125385A (en) * | 2021-04-13 | 2021-07-16 | 湘潭大学 | Based on Au @ MoS2Localized surface plasmon enhanced NO2Gas sensor and preparation method thereof |
| CN113607783A (en) * | 2021-07-28 | 2021-11-05 | 中国科学院上海硅酸盐研究所 | Room temperature NO based on molybdenum disulfide/reduced graphene oxide composite material2Sensor and preparation method thereof |
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| CN111398368B (en) * | 2020-04-30 | 2023-11-07 | 中国人民解放军陆军防化学院 | Molybdenum disulfide-based nitrogen dioxide gas sensor and preparation method thereof |
| CN113125385A (en) * | 2021-04-13 | 2021-07-16 | 湘潭大学 | Based on Au @ MoS2Localized surface plasmon enhanced NO2Gas sensor and preparation method thereof |
| CN113125385B (en) * | 2021-04-13 | 2022-12-02 | 湘潭大学 | Based on Au @ MoS 2 Localized surface plasmon enhanced NO 2 Gas sensor and preparation method |
| CN113607783A (en) * | 2021-07-28 | 2021-11-05 | 中国科学院上海硅酸盐研究所 | Room temperature NO based on molybdenum disulfide/reduced graphene oxide composite material2Sensor and preparation method thereof |
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