Visible Light-Induced Room-Temperature Formaldehyde Gas Sensor Based on Porous Three-Dimensional ZnO Nanorod Clusters with Rich Oxygen Vacancies

• DOI: 10.1021/acsomega.2c02613
• Publication Date: 2022-06-21T22:16:03Z
• Authors: Bo Zhang; Jing Wang; Qufu Wei; Pingping Yu; Shuai Zhang; Yin Xu; Yue Dong; Yi Ni; Jinping Ao; Yi Xia
• Keywords: Nanorod; Visible spectrum

Oxygen vacancy (VO) is a kind of primary point defect that extensively exists in semiconductor metal oxides (SMOs). Owing to some its inherent qualities, an artificial manipulation VO content one material has evolved into hot research field, which deemed be capable modulating band structures and surface characteristics SMOs. Specific the gas-sensing area, engineering sensing materials become effective means enhancing sensor response inducing light-enhanced sensing. In this work, high-efficiency microwave hydrothermal treatment was utilized prepare VO-rich ZnO sample without additional reagents. The X-ray photoelectron spectroscopy test revealed significant increase proportion, from 9.21% commercial 36.27% synthesized possessing three-dimensional air-permeable microstructures. subsequent UV-vis-NIR absorption photoluminescence indicated extension visible region gap reduction ZnO. It turned out ZnO-based exhibited considerable 63% toward 1 ppm HCHO at room temperature (RT, 25 °C) under light irradiation. Particularly, response/recovery time only 32/20 s for further shortened 10/5 10 HCHO, excellent performance comparable most sensors working high temperatures. results work strongly suggested availability also provided meaningful candidate researchers develop high-performance RT detecting volatile organic compounds.