Hollow ZnWO₄/In₂O₃ Nanotubes for Ultrasensitive and Rapid Trace Detection of Triethylamine

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 ZnWO4 on In2O3 to achieve controllable modulation of oxygen vacancies and energy band structures in ZnWO4/In2O3 heterostructures. The sensor based on optimized ZnWO4/In2O3 exhibits significantly enhanced performance to detect triethylamine, including a lower operating temperature (100 °C), a higher responsivity (Ra/Rg = 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 ZnWO4, 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.

Design of 3D flower-like NiWO4/WO3 heterostructures with excellent trimethylamine sensing performance

“…4(e) and (f)), attributed to lattice oxygen (O L ), oxygen vacancies (O V ), and surface-adsorbed oxygen (O C ), located at 530.14/530.51, 531.63/531.58, and 532.77/533.45 eV, respectively. 25,26 Comparison with pure WO 3 (O C : 3.76%; O V : 7.16%) reveals a significant increase in the proportion of O C and O V in the 10-NiWO 4 /WO 3 composites (O C : 7.36%; O V : 23.85%), suggesting excellent sensing performance of the 10-NiWO 4 /WO 3 composites.…”

Study of the Gas Sensing Performance of Ni-Doped Perovskite-Structured LaFeO3 Nanospheres

“…Triethylamine (TEA) is a common volatile organic compound of the amine class and an important industrial raw material. Due to its low production cost, ease of preparation, and wide range of applications, it is used in various industrial scenarios [1][2][3]. Additionally, TEA is a volatile and toxic substance to the human body.…”