Enhanced Interface Charge Carrier Transport of SnO<sub>2</sub>/CeO<sub>2</sub> via Oxygen Vacancy Synergized Heterojunction for Triethylamine Sensing Property
Jinmei Liu, Shaohan Feng, Lixia Sun, Wei Xu, Ling‐Ling Chen, Dankui Liao, Jianhua Sun
Abstract
Efficient charge carrier transport characteristics are critical to achieving the excellent performance of metal-oxide semiconductor gas sensors. Herein, SnO 2 /CeO 2 heterojunction layered nanosheets with abundant oxygen vacancies were successfully synthesized through a simple solvothermal assisted high-temperature calcination method. The synergistic effect of oxygen vacancies and heterojunctions promoting the charge carrier transport properties at the SnO 2 /CeO 2 interface for the enhanced sensing properties of triethylamine (TEA) was highlighted. As a result, the optimized SnO 2 /CeO 2 exhibits improved gas sensing performance at 173 °C to 50 ppm of TEA. These include high response (205), excellent selectivity, low detection limit, and good long-term stability. This enhanced gas sensing property of SnO 2 /CeO 2 is mainly attributed to the fact that the heterojunction and oxygen vacancies act as dual active sites synergistically inducing electron transfer, thereby effectively modulating the transport properties of the interfacial charge carriers, and thus facilitate the surface reactions efficiently. In this work, the dual-engineering strategy of synergistic interaction of heterojunction and oxygen vacancies can provide new perspectives for the design of advanced gas sensing materials.