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QCM (quartz crystal microbalance) based polypyrrole/ titanium dioxide frequency type film gas sensitive sensor and preparation method thereof

A gas sensor and titanium dioxide technology, which is applied in the field of polypyrrole/titanium dioxide frequency type thin film gas sensor, can solve problems such as low sensitivity, and achieve the effects of low cost, simple operation and good adhesion

Active Publication Date: 2015-06-03
ZHEJIANG UNIV
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  • 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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  • QCM (quartz crystal microbalance) based polypyrrole/ titanium dioxide frequency type film gas sensitive sensor and preparation method thereof
  • QCM (quartz crystal microbalance) based polypyrrole/ titanium dioxide frequency type film gas sensitive sensor and preparation method thereof
  • QCM (quartz crystal microbalance) based polypyrrole/ titanium dioxide frequency type film gas sensitive 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 Pielka's reagent for 10 minutes to make it carry 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 QCM s...

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Abstract

The invention discloses a QCM (quartz crystal microbalance) based polypyrrole / titanium dioxide frequency type film gas sensitive sensor and a preparation method thereof. According to the QCM based polypyrrole / titanium dioxide frequency type film gas sensitive sensor, AT-cut 10MHz QCM is taken as a substrate, an electrostatic layer-by-layer self-assembly method for a polypyrrole / titanium dioxide nano-composite is adopted for preparing a gas sensitive film, water molecules are removed through heat treatment, and the gas sensitive sensor is prepared. The sensitivity and the resolution of a frequency signal measured by the gas sensitive sensor are far better than those of a corresponding resistance signal, and a polymerized nano-composited polypyrrole / titanium dioxide self-assembly layer can greatly improve the room-temperature gas sensitive response of a component. The method is simple in preparation process and low in cost and is particularly suitable for mass production. The prepared gas sensitive sensor has very high response sensitivity and very good resilience on ammonia gas and trimethylamine, has the characteristics of capacity of detection at the room temperature, long-term stability and the like and can be widely applied to industrial and agricultural production processes and accurate room-temperature measurement and control of toxic gas with low concentration in the atmospheric environment.

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 Applications(China)
IPC IPC(8): G01N5/00
Inventor 王俊崔绍庆
Owner ZHEJIANG UNIV
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