期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 153, 期 1, 页码 11-16出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.09.070
关键词
Nanostructure geometry effect; Tin oxide; Gas sensing; Thermal evaporation
SnO2 microwires, nanowires and rice-shaped nanoparticles were synthesized by a thermal evaporation method. The diameters of microwire and nanowire were 2 mu m and 50-100 nm, respectively, with approximately the same length (similar to 20 mu m). The size of nanoparticles was about 100 nm. It was confirmed that the as-synthesized products have SnO2 crystalline ruble structure. The sensing ability of SnO2 particle and wire-like structure configured as gas sensors was measured. A comparison between the particle and wire-like structure sensors revealed that the latter have numerous advantages in terms of reliability and high sensitivity. Although its high surface-to-volume ratio, the nanoparticle sensor exhibited the lowest sensitivity. The high surface-to-volume ratio and low density of grain boundaries is the best way to improve the sensitivity of SnO2 gas sensors, as in case of nanowire sensor which exhibited a dramatic improvement in sensitivity to NO2 gas. (C) 2010 Elsevier B.V. All rights reserved.
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