Hollow ZnWO<sub>4</sub>/In<sub>2</sub>O<sub>3</sub> Nanotubes for Ultrasensitive and Rapid Trace Detection of Triethylamine
Duo Sun, Qilin Wang, Wei Wang, Yu Chen, Shengping Ruan
Abstract
The directional modulation of metal oxide semiconductors (MOSs) can be effective in developing high-performance gas-sensing materials. Herein, we propose an efficient strategy by modifying ZnWO 4 on In 2 O 3 to achieve controllable modulation of oxygen vacancies and energy band structures in ZnWO 4 /In 2 O 3 heterostructures. The sensor based on optimized ZnWO 4 /In 2 O 3 exhibits significantly enhanced performance to detect triethylamine, including a lower operating temperature (100 °C), a higher responsivity (R a /R g = 221.2 for 100 ppm), and a lower detection limit (500 ppb). In addition, the fabricated sensor exhibits faster response and good selectivity. The improved gas-sensing performance could be attributed to the acid–base interaction between triethylamine gas and ZnWO 4, the formation of heterojunctions, and the increase of oxygen vacancies to achieve a synergistic modulation of the chemical and energy band structures. It is anticipated that our current investigation could offer insights and a useful strategy for triethylamine detection.