NH3 Sensing Properties of CNT-WO3 Sensors

Abstract

Abstract: CNT-WO₃ indirectly heated gas sensors were fabricated with carbon nanotubes as the dopant. The as-grown carbon nanotube was purified by mixed acid oxidation process and WO₃
nanopowders were prepared by a chemical precipitation method. FT-IR, TEM, TG-DSC and XRD were introduced to characterize them. The gas sensitive
performance of the made sensors was measured at room temperature. The experimental results show the gas sensitivity of the carbon nanotube-doped
sensor is far higher than that of a pure WO₃ sensor and the 0.8wt% carbon nanotube-doped sensor has the highest sensitivity. In addition, the carbon
nanotube-doped sensor is superior for its lowest detectable concentration, wide detectable range and excellent gas selectivity. It is an ideal NH₃
sensor.

Key words: carbon nanotube, WO₃, gas sensitivity, NH₃

CLC Number:

TP212

LI Ling,PAN Qing-Yi,CHENG Zhi-Xuan,DONG Xiao-Wen,CHEN Hai-Hua. NH₃ Sensing Properties of CNT-WO₃ Sensors[J]. Journal of Inorganic Materials.

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NH₃ Sensing Properties of CNT-WO₃ Sensors

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