Abstract
Pure and La-doped SnO2 nanoparticles were synthesized by ball-milling solid chemical reaction method. The microstructure, morphologies and gas sensing properties of as-synthesized nanoparticles were characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray, transmission electron microscope and gas-sensing measurement device. Compared with pure SnO2 sensor, La-doped SnO2 sensor exhibited excellent formaldehyde sensing properties at the optimum temperature of 240 °C. Among them, 3 at% La-doped SnO2 sensor showed the highest response of 31.5–50 ppm formaldehyde vapor, the response and recovery time were 5 and 26 s, respectively. Moreover, the relationships between response value and HCHO concentration, and the selectivity of pure and 3 at% La-doped SnO2 sensor were investigated. The result indicated that the 3 at% La-doped SnO2 sensor had high response, short response-recovery time and good selectivity to formaldehyde. Finally, the gas-sensing mechanism of SnO2 sensor were discussed.
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The authors are grateful for the Project 2014GZ0090 supported by the Science and Technology Support Program in Sichuan.
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xiang, X., zhu, D. & wang, D. Enhanced formaldehyde gas sensing properties of La-doped SnO2 nanoparticles prepared by ball-milling solid chemical reaction method. J Mater Sci: Mater Electron 27, 7425–7432 (2016). https://doi.org/10.1007/s10854-016-4718-8
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DOI: https://doi.org/10.1007/s10854-016-4718-8