Constructing 3D porous SnO2 nanomaterials for enhanced formaldehyde sensing performances

• Published in: Journal of materials science. Materials in electronics Vol. 31; no. 17; pp. 14174 - 14183
• Main Authors: Tian, Chunxia, Guo, Huixiao, Li, Haiying, Li, Yu, Li, Xiaosong, Sun, Dan, Zhang, Jianxia, Liu, Li
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.09.2020; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Formaldehyde; Gas sensors; Grain size; Low temperature; Materials Science; Morphology; Nanomaterials; Optical and Electronic Materials; Recovery time; Selectivity; Sensitivity enhancement; Tin dioxide
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-020-03973-9

3D porous SnO 2 nanomaterials enhanced gas sensitivity properties for formaldehyde has been successfully prepared by a simple template method. The morphology of the synthesized SnO 2 was observed by a scanning electron microscope (SEM) as a 3D porous structure with a pore diameter of 120 nm. We systematically studied the gas sensing performance of 3D porous SnO 2 and particulate SnO 2 . The result shows that the response value of 3D porous SnO 2 to 100 ppm formaldehyde gas was 51.0 at low temperature 230 ℃, which was 6.4 times higher than that of particulate SnO 2 (8.0), and the response/the recovery time of 3D porous SnO 2 was 8 s/15 s. The minimum detection concentration of 3D porous SnO 2 was 0.5 ppm formaldehyde with the response value of 2. However, particulate SnO 2 can only be detected 10 ppm with the response value of 2. In addition, the selectivity coefficient of 3D porous SnO 2 for formaldehyde was up to 7, which is better than particulate SnO 2 (1). The reason for the enhanced sensitivity of 3D porous SnO 2 formaldehyde gas is not only related to its porous structure and smaller grain size, but also to the increase in oxygen vacancies.