A novel ammonia gas sensor based on reduced graphene oxide-tungsten disulfide composite material and its preparation process

A gas sensor, tungsten disulfide technology, applied in the direction of material resistance, material analysis, material analysis through electromagnetic means, etc., can solve the problems of less research on gas sensitivity response, unstable signal, low response, etc., and achieve good gas sensitivity Response, improved stability and service life, reduced aging effects

Active Publication Date: 2020-01-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, there are few studies on the gas-sensing response of tungsten disulfide, and in the normal temperature test, it shows defects such as low response, unstable signal, and no plateau period in the gas-sensing test.

Method used

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  • A novel ammonia gas sensor based on reduced graphene oxide-tungsten disulfide composite material and its preparation process
  • A novel ammonia gas sensor based on reduced graphene oxide-tungsten disulfide composite material and its preparation process
  • A novel ammonia gas sensor based on reduced graphene oxide-tungsten disulfide composite material and its preparation process

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Embodiment 1

[0041] This implementation provides a new type of ammonia gas sensor based on reduced graphene oxide-tungsten disulfide composite material and its preparation process, including a gas-sensing composite material and a sensor substrate. Among them, the composite material is also a new original graphene oxide-tungsten disulfide composite material (as shown in Figure 1, Figure 2, Figure 3), which is characterized in that the reduced graphene oxide-tungsten disulfide composite material is a new type of synthetic lamellar gas sensitive material , prepared by one-step heating method, has good response characteristics to low concentration ammonia gas, for example, to 30ppm ammonia gas, the gas sensitivity response Rs of the composite material at room temperature (20°C-30°C) is about 50. For the sensor substrate, the characteristic is that the thickness of the sensitive material coating is 0.4-0.5mm, and the transient heating plate is attached to the back of the ceramic substrate of the...

Embodiment 2

[0050] The difference between the technical solution of this embodiment and Embodiment 1 is that the concentration of the test gas is different. This embodiment only describes the different parts, and the same parts will not be repeated. The test gas NH of this embodiment 3 , The test concentration is 10ppm, 20ppm, 30ppm, 40ppm, 50ppm. Figure 6 Response signal Rs of the reduced graphene oxide-tungsten disulfide composite to different concentrations of ammonia.

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Abstract

The invention provides a novel ammonia gas sensor based on a reduced graphene oxide-tungsten disulfide composite and a preparation technology thereof and belongs to the technical field of sensors. The novel ammonia gas sensor comprises a gas-sensitive composite and a sensor substrate, wherein the gas-sensitive composite is a nano material obtained through one-step hydrothermal synthesis, the gas-sensitive composite is uniformly coated on a gold interdigitated electrode on the sensor substrate, transient heating temperature of a heating plate on the back of the sensor substrate is 140 DEG C, and heating recovery time is linearly varied along with concentration of detected gas. The reduced graphene oxide-tungsten disulfide composite disclosed by the invention shows good response performance on ammonia gas in a room temperature environment and has good selectivity, stability and repeatability. In a recovery stage of the gas sensor provided by the invention, transient heating is used, time required for reduction is effectively shortened without influencing performance of a gas-sensitive material, and concrete transient heating time can be set according to the gas concentration obtained through detection.

Description

technical field [0001] The invention relates to the technical field of electronic components, in particular to a novel ammonia gas sensor based on a reduced graphene oxide-tungsten disulfide composite material and a preparation process thereof. Background technique [0002] With the rapid development of industry, the problem of environmental pollution is becoming more and more prominent, among which air pollution and detection has become an important topic that more and more people pay attention to. Traditional metal oxide gas sensors used for industrial detection have disadvantages such as high cost, large volume, and high working temperature, and it is difficult to popularize and apply them to the daily life of ordinary people. However, the existing small gas detection devices in the market have problems such as poor stability and low response. Therefore, the development goals of today's gas sensors should be miniaturization, miniaturization, normal temperature detection,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 李晓干王雪燕王兢顾丁冯秋霞何婷婷
Owner DALIAN UNIV OF TECH
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