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Ternary composite gas sensor and preparation method thereof

A gas sensor, ternary composite technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of unfavorable gas sensing performance of polyaniline, easy aggregation and entanglement of carbon tubes, and improvement.

Pending Publication Date: 2022-03-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This gas sensor has a good response to ammonia, but the adjacent carbon tubes are easy to gather and entangle, which is not conducive to the further improvement of carbon nanotubes on the gas-sensing performance of polyaniline.

Method used

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  • Ternary composite gas sensor and preparation method thereof
  • Ternary composite gas sensor and preparation method thereof
  • Ternary composite gas sensor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A preparation method for a ternary composite gas sensor, comprising the following steps:

[0051] 1) disperse 5 mg of hydroxylated multi-walled carbon nanotubes into 20 ml of tan graphene oxide aqueous dispersion (concentration is 0.5 mg / ml), and reach a uniform and stable state after ultrasonic treatment for 30 minutes; the obtained oxidation The graphene / hydroxylated multi-walled carbon nanotube aqueous dispersion was transferred to a sealed Teflon-lined stainless steel autoclave, which was placed in a heating box at 180 °C for about 18 After the reaction was completed, it was left to stand and naturally cooled to room temperature; the obtained reduced graphene oxide / hydroxylated multi-walled carbon nanotube suspension was taken out from the reactor, washed with deionized water and ethanol for several 3 to 5 times; finally, after drying under vacuum conditions at 60°C, the reduced graphene oxide / hydroxylated multi-walled carbon nanotube composite powder is obtained; ...

Embodiment 2

[0056] A preparation method for a ternary composite gas sensor, comprising the following steps:

[0057] 1) Disperse 15 mg of hydroxylated multi-walled carbon nanotubes into 30 ml of tan graphene oxide aqueous dispersion (concentration is 0.5 mg / ml), and reach a uniform and stable state after ultrasonic treatment for 60 minutes; the obtained oxidation The graphene / hydroxylated multi-walled carbon nanotube aqueous dispersion was transferred to a sealed Teflon-lined stainless steel autoclave, which was placed in a heating oven at 220 °C for about 12 After the reaction was completed, it was left to stand and naturally cooled to room temperature; the obtained reduced graphene oxide / hydroxylated multi-walled carbon nanotube suspension was taken out from the reactor, washed with deionized water and ethanol for several 3 to 5 times; finally, after drying under vacuum conditions at 60°C, the reduced graphene oxide / hydroxylated multi-walled carbon nanotube composite powder is obtained;...

Embodiment 3

[0065] A kind of ternary compound gas sensor, refer to figure 1 , figure 2 , which includes a silicon substrate 1 at the bottom of the sensor, a silicon dioxide film 2 above the silicon substrate 1, and a first electrode 3 and a second electrode 4 on the surface of the silicon dioxide film 2, the first electrode 3, the second electrode Reduced graphene oxide / hydroxylated multi-walled carbon nanotubes / polyaniline ternary composite film 5 attached between 4 and its upper surface.

[0066] Further, the reduced graphene oxide / hydroxylated multi-walled carbon nanotubes / polyaniline ternary composite film 5 is composed of reduced graphene oxide sheets 52 , hydroxylated multi-walled carbon nanotubes 53 and polyaniline 51 .

[0067] As a preferred implementation manner, the electrode pattern in the electrode substrate is in the shape of a staggered comb.

[0068] Further, the distance between adjacent first electrodes 3 and second electrodes 4 is 10-80 μm.

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Abstract

The invention belongs to the technical field of gas sensitive elements and preparation thereof, and particularly relates to a ternary composite gas sensor and a preparation method thereof.The preparation method comprises the steps that hydroxylated multi-walled carbon nanotubes are dispersed into a graphene oxide aqueous dispersion, and a graphene oxide / hydroxylated multi-walled carbon nanotube composite solution is prepared; reducing, washing and drying the composite solution to obtain a reductive graphene oxide / hydroxylated multi-walled carbon nanotube composite material, dispersing the composite material in deionized water, adding an aniline monomer, transferring into an ice-water bath, adding hydrochloric acid, dropwise adding an ammonium persulfate aqueous solution to initiate a polymerization reaction, and drying to obtain the graphene / hydroxylated multi-walled carbon nanotube composite material. After the reaction is completed, obtaining a reduced graphene oxide / hydroxylated multi-walled carbon nanotube / polyaniline ternary compound, preparing the compound into dispersion liquid, coating the surface of an electrode substrate with the dispersion liquid, and drying to obtain the ternary compound gas sensor. The ternary composite gas sensor prepared by the invention has the characteristics of high sensitivity, good selectivity, good repeatability and the like in response to ammonia gas.

Description

technical field [0001] The invention belongs to the technical field of gas sensor and its preparation, and in particular relates to a ternary composite gas sensor and its preparation method. Background technique [0002] As an important organic gas sensor, polyaniline gas sensor has the characteristics of simple film formation and low cost, and has received extensive attention in recent years. The invention patent (application number 201310127805.8) discloses a polyaniline / carbon nanotube composite thin film gas sensor and its preparation method, including the steps of ultrasonically dispersing carbon nanotubes in an aqueous solution of polystyrene sulfonic acid, followed by adding aniline Monomer and ammonium persulfate aqueous solution, triggering polymerization reaction, after the reaction is completed, a water-dispersed polyaniline / carbon nanotube composite aqueous solution is obtained, and finally the composite aqueous solution is coated on the interdigitated gold elect...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 陈向东陈欣鹏丁星余兴林于翔
Owner SOUTHWEST JIAOTONG UNIV
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