Detection performance and mechanism of VOCs by different metal-doped SnO2-based gas sensors

doi:10.16085/j.issn.1000-6613.2024-1099

Abstract

Abstract:

Near-surface ozone (O₃) pollution in China is becoming more and more serious, and the "14th Five-Year" ecological and environmental plan has listed O₃ as a priority for control, so the measurement of volatile organic compounds (VOCs), which is a precursor of O₃, has become a focus. In order to meet the demand for portable monitoring of VOCs, SnO₂-based gas sensors were prepared and the gas-sensitive properties of SnO₂ were improved by doping with Sb, Co and Zn, respectively. The materials were characterized using SEM and XRD. The pure SnO₂ materials were spherical particles, the Sb-SnO₂ materials were crumbly and aggregated into clusters, the Co-SnO₂ materials appeared to be wheat flakes and the Zn-SnO₂ materials were regular rectangular flakes. The VOCs gas sensitivity test was performed for each sensor, and the results showed that the SnO₂ gas sensor had the highest response value for ethanol while the target gas of the Co-SnO₂ gas sensor was changed to acetone, and both the Sb-SnO₂ and Zn-SnO₂ gas sensors were selective for triethylamine. Among them, the Zn-SnO₂ gas sensor showed fast response (6s), good selectivity, good stability and low detection limit (<1μL/L) for triethylamine. The sensitivity of the Zn-SnO₂ sensor for 50μL/L triethylamine at the optimum operating temperature of 250℃ was 49.6, which was 8.1 times higher than that of the SnO₂ gas sensor. Finally, the sensitivity mechanism of the gas sensors was briefly analyzed in order to provide certain technical support for the environmental detection of trace atmospheric VOCs.

Key words: volatile organic compounds (VOCs), gas sensors, metal doping, stannic oxide (SnO₂), gas-sensitive properties

摘要：

我国近地面臭氧（O₃）污染日益严重，“十四五”生态环境规划把O₃列为控制重点，因此，作为O₃前驱物质的挥发性有机物（VOCs）测量成为了一个焦点。本研究以VOCs的便携监测为需求，制备基于SnO₂的气体传感器，并分别用Sb、Co、Zn掺杂改善SnO₂的气敏性能。利用SEM和XRD表征材料，纯SnO₂材料为球状颗粒；Sb-SnO₂材料为碎屑状并聚集成团；Co-SnO₂材料似麦片状；Zn-SnO₂材料为规则的矩形薄片。对各传感器进行VOCs气敏测试，结果表明，SnO₂气体传感器对乙醇有最高的响应值；而Co-SnO₂气体传感器的目标气体变为丙酮；Sb-SnO₂与Zn-SnO₂气体传感器均对三乙胺有选择性。其中，Zn-SnO₂气体传感器对三乙胺响应速度快（6s）、选择性好、稳定性佳、检测下限低（<1μL/L）。Zn-SnO₂传感器在最适工作温度250℃下对50μL/L三乙胺的灵敏度为49.6，较SnO₂气体传感器的灵敏度提升了8.1倍。最后，简要分析了气体传感器的敏感机理，以期为痕量大气VOCs环境检测提供一定的技术支持。

关键词: 挥发性有机物, 气体传感器, 金属掺杂, 二氧化锡, 气敏性能

CLC Number:

X511

CHENG Jingwen, CHEN Qingcai, YU Bo, LIU Huan, XU Tengfei, HU Yukun, LIU Sitong. Detection performance and mechanism of VOCs by different metal-doped SnO₂-based gas sensors[J]. Chemical Industry and Engineering Progress, 2025, 44(9): 5140-5149.

程静雯, 陈庆彩, 于博, 刘欢, 徐腾飞, 呼宇坤, 刘思彤. 不同金属掺杂的SnO₂基气体传感器对挥发性有机物的检测性能及机制[J]. 化工进展, 2025, 44(9): 5140-5149.

Figures/Tables 14

References 44

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样品	平均孔径/nm	孔容积/cm³·g^-1	比表面积/m²·g^-1
SnO₂	4.1999	0.0908	86.5241
Sb-SnO₂	19.8434	0.2244	45.2376
Co-SnO₂	23.5044	0.1558	26.5188
Zn-SnO₂	26.1887	0.2291	34.9946

样品	平均孔径/nm	孔容积/cm³·g^-1	比表面积/m²·g^-1
SnO₂	4.1999	0.0908	86.5241
Sb-SnO₂	19.8434	0.2244	45.2376
Co-SnO₂	23.5044	0.1558	26.5188
Zn-SnO₂	26.1887	0.2291	34.9946

Detection performance and mechanism of VOCs by different metal-doped SnO₂-based gas sensors

不同金属掺杂的SnO₂基气体传感器对挥发性有机物的检测性能及机制

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