Oxygen vacancy and interface effect dual modulation of SnS2/SnO2 heterojunction for boosting formaldehyde detection at low temperature

被引：0
作者：
Meng, Dan [1 ]
Ma, Li [1 ]
Zhang, Lei [1 ]
San, Xiaoguang [1 ]
Xie, Zongsheng [1 ]
Jin, Quan [2 ]
Qi, Jian [3 ]
机构：
[1] Shenyang Univ Chem Technol, Coll Chem Engn, Shenyang 110142, Peoples R China
[2] Jilin Univ, Sch Mat Sci & Engn, Key Lab Automobile Mat, Minist Educ, Changchun 130022, Peoples R China
[3] Chinese Acad Sci, Inst Proc Engn, State Key Lab Biochem Engn, Beijing 100190, Peoples R China
来源：
TALANTA | 2025年 / 286卷
基金：
中国国家自然科学基金;
关键词：
SnS; 2; /SnO; heterojunction; Oxygen vacancy; Interface effect; Sensor; Formaldehyde detection; GAS; NANOPARTICLES;
D O I：
10.1016/j.talanta.2025.127586
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Formaldehyde (HCHO) is a harmful volatile organic pollutant, which is commonly found in interior decoration and furniture products. Therefore, it is necessary to develop a gas sensor that can quickly and accurately detect formaldehyde for human health and environmental protection. In order to achieve this goal, in this work, SnS2/ SnO2 heterostructure was synthesized by in-situ sulfurization process on the basis of SnO2 nanospheres, and its formaldehyde sensing performance was studied. After testing, it was found that the gas sensor based on SnS2/ SnO2 heterojunction has more excellent gas sensing performance than pure SnO2 gas sensor at the same operating temperature (100 degrees C). Specifically, SnS2/SnO2-2 (Sn:S = 3:2) has the advantages of high sensitivity (4.01 at 0.1 ppm), excellent selectivity, low theoretical detection limit (13.26 ppb), good humidity resistance and longterm stability. The excellent sensing performance of SnS2/SnO2 sensors for formaldehyde detection is mainly attributed to the n-n heterojunction formed by SnS2 and SnO2, which generates a built-in electric field to accelerate the electron transport in the material, the higher oxygen vacancy sites adsorb a large number of reactive gas molecules to promote the oxidation of formaldehyde molecules, and the unique porous structure to promote the transmission and diffusion of gases and increase the surface area to provide more adsorption sites and reactive centers for gas molecules. Therefore, the construction of SnS2/SnO2 heterostructures will be an effective way to develop next-generation formaldehyde gas sensors with higher sensing performance.
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页数：12
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