Graphene/titanium dioxide thin film gas sensor and preparation method thereof

Abstract

The invention discloses a graphene / titanium dioxide thin film gas sensor and a preparation method thereof. A QCM (quartz crystal microbalance) is taken as a substrate, a gas sensitive thin film is prepared with a method of layer-by-layer self-assembly of a graphene / titanium dioxide nano-composite, water molecules are removed through heat treatment, and the graphene / titanium dioxide composite sensitive film gas sensor is prepared. The gas sensitive thin film is prepared from graphene sheet layers and a titanium dioxide nanocrystal particle composite, wherein graphene has a very large specific surface area, and a titanium dioxide crystal adopting a nano structure can improve the room-temperature gas sensitive response of the sensor greatly. The method is simple in preparation process, low in cost and particularly suitable for batch production. The prepared gas sensor has the characteristics of very high response sensibility to alkane and ammonia, good resilience, capacity of performing detection at the room temperature and the like, and can be widely applied to accurate measurement and control of low-concentration poisonous gas in industrial and agricultural production process and atmospheric environment.

Description

technical field [0001] The invention relates to a graphene / titanium dioxide sensitive film gas sensor and a preparation 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 sensitivity to trace gases has become a technical problem to be solved urg...

AI Technical Summary

Problems solved by technology

However, for gas sensors, most of them have high requirements on the working environment, and the sensor element needs to be heated to an operating temperature of several hundred degrees Celsius to have better gas sensitivity, but high temperature detection has brought a lot to the actual operation. Inconvenient, it is particularly important to develop gas sensors with high sensitivity and room temperature response characteristics

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