Enhanced formaldehyde gas-sensing response based on indium oxide nanowires doped with same-valence metal cations

J. Y. Niu; B. Hong; J. C. Xu; Y. B. Han; H. X. Jin; D. F. Jin; Y. X. Zeng; X. L. Peng; H. L. Ge; X. Q. Wang

doi:10.1039/D2MA00730D

Enhanced formaldehyde gas-sensing response based on indium oxide nanowires doped with same-valence metal cations

J. Y. Niu,^a B. Hong,^a J. C. Xu,

^a Y. B. Han,^a H. X. Jin,^a D. F. Jin,^a Y. X. Zeng,^a X. L. Peng,^a H. L. Ge^a and X. Q. Wang

*^a

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* Corresponding authors

^a College of Materials Science and Chemistry, China Jiliang University, Hangzhou, China
E-mail: wxqnano@cjlu.edu.cn

Abstract

Mesoporous indium oxides nanowires (In₂O₃ NWs) doped with Al, Sb and La were synthesized using a nanocasting method, and then the components, microstructures and morphology were characterized. All results indicate that the doped metals are well dispersed in the In₂O₃ NWs and hardly affect the NW microstructure and morphology. While the cations-doped concentration decreases greatly with the increasing radii of Al, Sb and La cations. The cation-doping not only causes the lattice distortion to improve the adsorbed oxygen on the surface, but also increases the ground-state resistance of the In₂O₃ NWs. In this way, the cation-doping greatly affects the gas-sensing behavior of formaldehyde gas. Considering the resistance in air and formaldehyde gas, the In_1.984La_0.016O₃ NW sensor exhibits the best gas-sensing performance of 10 ppm formaldehyde gas with a response of 39.51 at 210 °C owing to the largest radius and lowest doping content of La³⁺.

Materials Advances

Enhanced formaldehyde gas-sensing response based on indium oxide nanowires doped with same-valence metal cations

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Enhanced formaldehyde gas-sensing response based on indium oxide nanowires doped with same-valence metal cations

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