Graphene (Graphene) is a two-dimensional nanostructure composed of a single layer of carbon atoms in the form of a honeycomb. It has a large specific surface area and good carrier conduction properties. widely used. However, due to the interaction between the sensing substance and graphene, such as adsorption, charge transfer, and desorption, there is still a lot of work to be explored in terms of effective fabrication methods and performance optimization of the device.
Nitric oxide (NO) gas is on the one hand a harmful gas, on the other hand it is an important biological function information transmission molecule. Timely monitoring the changes in NO concentration of exhaled air can provide early warning of the onset of lung diseases such as asthma. However, the current NO breathing gas testing instruments are large in size and expensive, and most of them are concentrated in large medical institutions and cannot be promoted and used on a larger scale.
Recently, Liwei Wei, a research group of Liu Liwei from the Device Department of the Institute of Nanotechnology and Nanobionics, Chinese Academy of Sciences, and other researchers from the Institute of Physics of the Chinese Academy of Sciences have made progress in making graphene-based highly sensitive nitric oxide gas sensors. The researchers used micro-nano-processed graphene as the electrode, and used AC electrophoresis technology to make metal nanoparticles modified and reduced graphene oxide sensing channels. The role of gas molecules reduces the thickness of the Schottky barrier between graphene and metal particles, achieving high sensitivity detection performance of 1 ppb (one billionth) to 1 ppm (one millionth), for low power consumption , Room temperature NO highly sensitive respiration and environmental detection has potential application value. The schematic diagram and performance test of the device are shown in the figure.
The results of this work have been published in ACS Nano (2011, 5 (9), pp 6955–6961).
The research was supported by the National Fund Committee, the Ministry of Science and Technology, and the Suzhou Science and Technology Development Program, and received technical support from Suzhou Nano Processing and Testing Platform.
Structure and performance of highly sensitive sensor device based on graphene
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