Preparation and room-temperature NO<sub>2 </sub>sensitivity of SnO<sub>2</sub>/ZnS heterojunctions gas sensor

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Abstract

SnS ₂/ZnS microflower structures are prepared by one-step hydrothermal method. The microflower structures with different components are obtained after calcinating SnS ₂/ZnS in air atmosphere. The influences of calcination temperature on the components and gas-sensing properties of microflower structures are investigated by X-ray diffractometry (XRD), scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS), transmission electron microscopey (TEM), and gas sensitive characteristic analyzer. The results show that the gas-sensing performance to NO ₂at room temperature of SnO ₂/ZnS microflower structure (SZ-450) is better than that of microflower structure calcinated at the other temperature. The response of SZ-450-based sensor to 10 ^–4NO ₂at room temperature can reach 27.55, the response/recovery time is 53 s/79 s, the theoretical detection limit is as low as 2.1×10 ^–7, and it has good selectivity, repeatability, and stability. The analysis indicates that the excellent room-temperature gas-sensing characteristic of SZ-450 is related to the heterojunction between SnO ₂and ZnS. This work can provide sensitive materials for room-temperature NO ₂gas sensor and promote its development and application.

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Authors and contacts

Corresponding author:Sun Yong-Jiao,sunyongjiao@tyut.edu.cn; Hu Jie,hujie@tyut.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 61904122, 62171308) and the Shanxi Scholarship Council of China (Grant Nos. 2022-071, 2022-070).

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敏感材料	NO₂浓度/10^–6	响应	温度/℃	响应/恢复时间/(s·s^–1)	理论检测下限/10^–6	Ref.
Pd/ZnS	5	15.1	室温	—/—	—	[19]
ZnS/ZnO	5	1.16	室温	—/—	—	[20]
Au/ZnS	5	8.84	300	—/—	—	[21]
ZnS/N-rGO	10	2.20	室温	—/724	—	[22]
ZnO-ZnS	10	1.51	室温	100/132 (170 ℃)	0.5	[23]
TiO₂-ZnS	1	1.91	300	—/ ~540	—	[24]
MoS₂/ZnS	5	7.20	室温	—/276	—	[25]
CuO-ZnS	5	1.14	室温	52/45	—	[26]
SnO₂/ZnS	5	3.34	室温	53/79	0.2	本文

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Vol. 72, Issue 16 - 2023-08-20

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