Polyaniline/ titanium dioxide nanometer composite impedance type thin film gas sensor and preparation method thereof

A gas sensor, titanium dioxide technology, applied in the field of sensors, can solve the problems such as inappropriate control of the contact between the sensitive film and the sensor substrate, inability to reuse conductive polymer residues, and the thickness of the sensitive film of the gas sensor sensor, etc. Migration, effects on response sensitivity and response speed
CN102866181BInactive Publication Date: 2015-07-15ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2015-07-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a polyaniline / titanium dioxide nanometer composite impedance type thin film gas sensor and a preparation method thereof. The gas sensor comprises a ceramic base body, an interdigital gold electrode and a gas-sensitive thin film. The gas-sensitive thin film is composed of a polyaniline / titanium self-assembly layer and a polyaniline layer, wherein the polyaniline / titanium self-assembly layer can greatly improve response sensitivity of the sensor to gas under room temperature, accelerates response and improves stability, and the polyaniline layer can reduce impedance of elements well. The gas sensor has high response sensitivity to ammonia gas under the room temperature, has extremely good responding performance, responds quickly, is good in stability, and can be widely applied to accurate measurement and control of ammonia gas concentration in the industrial and agricultural production process and the atmospheric environment. The invention further provides the method for preparing the gas sensor. The method is simple in process, low in cost and extremely suitable for mass production.
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Description

technical field

[0001] The invention relates to the field of sensors, in particular to a polyaniline / titanium dioxide resistance thin-film gas sensor and a preparation method thereof. Background technique

[0002] Gas sensors are an important class of chemical sensors, which are widely used in storage, industrial production, process control, environmental monitoring, etc., and play an increasingly important role in the development of modern science and technology and people's lives, constantly pursuing high performance, Low cost, small size, etc. have become problems to be solved urgently in the sensor industry. In addition, the introduction and innovation of new materials and technologies have made it possible to solve these problems.

[0003] Traditional gas sensor sensitive materials include inorganic semiconductor materials and organic conductive polymers. Inorganic semiconductor gas-sensing materials usually need to be used to detect gases under high temperature condi...

Claims

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