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Polypyrrole/titanium dioxide frequency type thin film qcm gas sensor and preparation method thereof

A gas sensor, titanium dioxide technology, applied in the field of polypyrrole/titanium dioxide frequency thin film gas sensor, can solve the problem of low sensitivity, achieve low cost, good adhesion, and stable performance

Active Publication Date: 2017-10-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conductive polymers have limited their wide application because of their long-term stability and low sensitivity.

Method used

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  • Polypyrrole/titanium dioxide frequency type thin film qcm gas sensor and preparation method thereof
  • Polypyrrole/titanium dioxide frequency type thin film qcm gas sensor and preparation method thereof
  • Polypyrrole/titanium dioxide frequency type thin film qcm gas sensor and preparation method thereof

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Experimental program
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Effect test

Embodiment

[0037] The manufacture method of polypyrrole / titanium dioxide frequency type film gas sensor of the present invention comprises the following steps:

[0038] 1) QCM substrate cleaning

[0039] The QCM substrate was soaked and cleaned in absolute ethanol and acetone, and dried for later use.

[0040] 2) Modification of QCM substrate

[0041] 1. The QCM substrate was treated with Pilkard's reagent for 10 minutes, so that it was charged with negatively charged groups such as carboxyl groups, and the treated QCM substrate was rinsed with deionization for 1 minute and dried with nitrogen. 2. Immerse in 1%wt polydimethyldiallylammonium chloride (PDDA) aqueous solution for 5 minutes, take it out and rinse it with deionized water for 1 minute and dry it with nitrogen. 3. Immerse the QCM substrate in sodium toluene sulfonate (PSS) for 5 minutes, take it out and rinse it with deionization for 1 minute and dry it with nitrogen. Repeat step 2 and step 3 twice in sequence to modify the ...

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Abstract

The invention discloses a polypyrrole / titanium dioxide frequency type thin film QCM gas sensor and a preparation method thereof. It is based on AT-cut, 10MHz quartz crystal microbalance (QCM) as the substrate, and the gas-sensitive film is made by the method of electrostatic layer-by-layer self-assembly of polypyrrole / titanium dioxide nanocomposite. After heat treatment to remove water molecules, the obtained . The measured frequency signal sensitivity and resolution are far better than the corresponding resistance signal, and the polymerized nanocomposite polypyrrole / titania self-assembled layer can greatly improve the room temperature gas sensing response of the device. The method has simple preparation process and low cost, and is especially suitable for mass production. The prepared gas sensor has high response sensitivity and good recovery to ammonia and trimethylamine, can be detected at room temperature and has long-term stability, and can be widely used in industrial and agricultural production processes and low-concentration toxic in the atmospheric environment. The room temperature of the gas is accurately measured and controlled.

Description

technical field [0001] The invention relates to a polypyrrole / titanium dioxide frequency type film gas sensor based on a quartz crystal microbalance substrate (QCM) and a manufacturing method thereof. Background technique [0002] Gas sensors are an important class of biochemical sensors, which have a wide range of applications in life safety, environmental monitoring, health care, industrial development and food detection, etc., and have played an indispensable role in the development of science and technology and people's lives. With the continuous improvement of living standards, the market has more and more stringent requirements for sensor detection parameters, such as the qualitative and quantitative rapid assessment of trace levels of toxic volatile gases and trace irritating gases in the process of food decay. And detection has always been the weakness of traditional sensor development, so research on new gas-sensitive sensors with high selectivity and high sensitivi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/00
Inventor 王俊崔绍庆
Owner ZHEJIANG UNIV
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