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In recent years, the rise of nanotechnology has brought new opportunities for the development of sensors, especially nanostructured materials, which have a large active surface area and can effectively improve the sensor's sensitivity. However, how to construct a nano-sensitive interface that is prone to gas diffusion and develop highly sensitive and highly stable nano-gas sensor devices is still a difficulty faced by current sensor research.
In response to these problems, the researchers first designed and synthesized porous single crystal nanobelts using sensitive material zinc oxide as the research object. Using a method of calcining a precursor and combining LB film self-assembly technology, a uniform thin porous single crystal zinc oxide nanoribbon sensitive film was successfully constructed. Gas-sensitivity studies have shown that: Based on the synergistic effect of thin layers, porous and single crystal nanostructures, a highly sensitive and stable response to volatile organic pollutants is successfully achieved. After the research was published, Labtalk News at Nanotechweb.org reported under the heading Porous and single crystalline nanobelts prove promising sensing nanomaterials.
In addition, the researchers also designed and synthesized a three-dimensional tin oxide nano-graded structure and optimized its gas-sensing properties by regulating the morphology of the hierarchical nanostructures. Based on the microstructural characterization analysis, it was found that the nano-gradient structure with a large number of surface defects and dislocations exhibited the best sensitivity performance, revealing the intrinsic correlation of the morphology evolution of the nano-scaled structure with its sensitive properties. The nano-gas sensors constructed exhibit a highly sensitive response to typical volatile organic compounds (VOCs) (as low as ppb detection limit for acetone), as well as good stability and repeatability (after 4 months, detection The maximum decrease in sensitivity is only 15%).
The above research progress has important guiding significance for the design and development of high-performance nano-gas sensors. The research work has been supported by projects such as the National Special Project National Nanoscale Project and the National Natural Science Foundation.
(Original title: Hefei Research Institute made progress in nanosensor research)
Hefei Institute of Chinese Academy of Sciences successfully built a nanometer gas sensor
ã€Chinese instrument network instrument research and development】 Recently, Guo Zheng, a researcher at the Institute of Nanomaterials and Environmental Detection at the Hefei Institute of Intelligent Machinery, Chinese Academy of Sciences, has successfully constructed porous single crystal nanobelts and three-dimensional hierarchical nanostructures as sensitive materials. Highly sensitive and highly stable nano gas sensor. Relevant research results were received and published by Nanotechnology (2016, 27, 355702) and ACS Sensors (DOI: 10.1021/acssensors.6b00597).