Cu掺杂对SnO<sub>2</sub>气敏响应的促进机制

doi:10.19976/j.cnki.43-1448/TF.2026060

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Abstract To determine the main influence mechanism of Cu doping on the gas-sensing performance of SnO₂, SnO₂, Cu-doped SnO₂, and CuO powders were prepared by the sol-gel method, and the gas-sensing response of Cu-doped SnO₂ to ethanol gas was systematically studied. The results show that when the molar ratio of Cu/Sn is 0-0.15, the gas-sensing response degree of Cu-doped SnO₂ to ethanol gas slightly increases with the increase of Cu-doping content. When the molar ratio of Cu/Sn reaches 0.18, the gas-sensing response degree of Cu-doped SnO₂ to ethanol gas shows a sudden increase and reaches its maximum value. Continuing to increase the molar ratio of Cu/Sn, the gas-sensing response degree of Cu-doped SnO₂ to ethanol gas decreases. When the molar ratio of Cu/Sn is 0-0.15, Cu²⁺ replaces Sn⁴⁺ in the SnO₂ lattice to form a solid solution, increasing the oxygen vacancies on the surface of SnO₂ grains and thereby slightly improving the gas-sensing response of SnO₂. When the molar ratio of Cu/Sn reaches 0.15, the solid solubility of Cu²⁺ in the SnO₂ lattice reaches its maximum. Continuing to increase the Cu-doping content, excess Cu²⁺ adhere to the surface of SnO₂ grains to form CuO quantum dots, catalyzing the reaction between SnO₂ and ethanol gas, thereby greatly improving the gas-sensing response of SnO₂. This is the main reason why Cu-doping promotes the gas-sensing response of SnO₂.

Key words： SnO₂ Cu-doped sol-gel method gas-sensing response catalytic mechanism

Received: 08 June 2026 Published: 12 November 2026

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	HOU Haiyun
	XU Jiale
	ZHANG Haojie
	ZHANG Zinan
	ZHANG Enkang
	LIU Songtao

Cite this article:

HOU Haiyun,XU Jiale,ZHANG Haojie, et al. The promoting mechanism of Cu doping on the gas-sensing response of SnO₂[J]. Materials Science and Engineering of Powder Metallurgy, 2026, 31(5): 557-564.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2026060 OR http://pmbjb.csu.edu.cn/EN/Y2026/V31/I5/557

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