A kind of preparation method of nano conductive material/polymer composite gas sensor

A gas-sensing sensor and nano-conducting technology, which is applied in the direction of material analysis, material resistance, and material analysis by electromagnetic means, can solve the problems of long response time, small resistance change, and limit the application range of composite sensors, so as to improve the sensitivity, The effect of improving uniformity

Active Publication Date: 2022-05-31
因士(上海)科技有限公司
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Problems solved by technology

[0004] At present, the percolation threshold of carbon black can be greatly reduced by means of in-situ polymerization filling, emulsion blending filling, grafting modification, etc., and its sensitivity, stability, and repeatability can be improved, but most researches tend to focus on saturated steam atmosphere Or high steam partial pressure atmosphere, this is because the PVC (positive steam coefficient, that is, as the steam concentration increases, the system resistance decreases) effect law of conductive nanomaterials / polymer-based conductive composites is often exponential. Within the range (1%-5% saturated vapor pressure) vapor molecules follow the gas adsorption law, resulting in a long response time and small resistance change of the conductive nanomaterial / polymer-based conductive composite material at this time, which greatly limits the application range of the composite sensor

Method used

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  • A kind of preparation method of nano conductive material/polymer composite gas sensor
  • A kind of preparation method of nano conductive material/polymer composite gas sensor
  • A kind of preparation method of nano conductive material/polymer composite gas sensor

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Experimental program
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Embodiment 1

[0036] As shown in Figure 2, when the sensor is in a VOC vapor atmosphere, the VOC molecules 5 penetrate into the polymer 4 matrix,

Embodiment 2

[0047] (i) The prepared composite gas sensor is subjected to aging treatment.

[0060] In order to make the present invention more obvious and easy to understand, an implementation example based on the preparation method of the gas sensor of the present invention is provided,

[0064] Under the standard test conditions, it is 29 ± 2 ° C, 65 ± 5% R.H, and the ordinate of Figure 3 represents the sensor resistance ratio Rs / R0, Rs

[0065] The ordinate of FIG. 4 represents the sensor resistance ratio Rs / R0, and the definitions of Rs and R0 are as follows: ΔR=sensor at various concentrations

[0066] The ordinate of FIG. 5 represents the sensor resistance ratio Rs / R0, and the definitions of Rs and R0 are as follows: Rs=sensor at various temperatures and humidity

[0067] The ordinate of FIG. 6 represents the sensor resistance ratio Rs / R0, and the definitions of Rs and R0 are as follows: Rs=sensor in different toluene

[0068] The real environment means that the concentration of no gas i...

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Abstract

The invention provides a method for preparing a conductive nanomaterial / polymer composite gas sensor, which relates to the field of gas sensors. The key points of the technical solution include a substrate, conductive particles and a polymer matrix arranged on the substrate, and the conductive particles are Nano-conductive particles, the polymer is in a stretched state, and the stretching is in the range of elastic deformation. The advantage is that the polymer matrix in the stretched state is rapidly swelled by VOC vapor, so that the conductive nano-particles are formed The conductive network of the conductive nanomaterial / polymer composite gas sensor is quickly disconnected to achieve the purpose of rapid response and improve the sensitivity of the conductive nanomaterial / polymer composite gas sensor to VOC gas detection.

Description

A kind of preparation method of nanometer conductive material / polymer composite gas sensor technical field The present invention relates to the field of gas sensors, particularly a kind of conductive nano-material / polymer composite gas sensor method of making the device. Background technique [0002] With the new development of Internet technology and the Internet of Things, the research and development of highly portable miniature VOC gas sensors is currently Research hotspots at home and abroad, VOC gas sensors are installed in mobile electronic devices such as mobile phones, tablet computers, wireless detection devices. It has become a future development trend, and emerging industry demands have put forward more stringent requirements on the low power consumption performance of VOC gas sensors. requirements, traditional metal oxides such as SnO 2 , ZnO, Fe 2 O 3 Although it has high sensitivity and low price, it requires high temperature (200℃‑500℃) fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127G01N27/126Y02A50/20
Inventor 汪桢李尤罗斌
Owner 因士(上海)科技有限公司
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