期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 960, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2023.170683
关键词
CuO; ZnO; Xylene; Gas sensor; Heterostructure
CuO-ZnO heterostructures containing different concentrations of Zn were synthesized via hydrothermal synthesis and used for xylene vapor detection. The sensor showed excellent selectivity, stability, and sensitivity towards xylene vapor, with a low detection limit of 9.5 ppb and a sensitivity of 0.063 ppm-1. The superior gas sensing characteristics of the CuO-ZnO heterostructure can be attributed to its large surface area, the creation of a p-n heterojunction, and the strong chemical affinity and catalytic performance of p-type CuO towards xylene vapor. The response mechanism to xylene was also clarified.
Xylene is not just considered detrimental to the environment but also hazardous to humans. Herein we report on xylene vapour detection using CuO-ZnO heterostructures containing various concentrations (0.1-2.0 wt%) of Zn, prepared via hydrothermal synthesis. X-ray diffraction, scanning, and transmission electron microscopy, as well as x-ray photoelectron spectroscopy, validated the formation of the CuO-ZnO heterostructure. Gas detection, sensitivity, selectivity, and stability tests of nine different gases, namely benzene, toluene, ethylbenzene, xylene, ethanol, methane, SO2, NO2, and CO2 at various operational tem-peratures were subsequently investigated. It was found that a CuO-ZnO heterostructure with 1.0 wt% Zn showed excellent selectivity towards 100 ppm of xylene at 100 & DEG;C. The sensor further demonstrated an insignificant cross-sensitivity (Sxylene/Stoluene=2.7) and (Sxylene/Sbenzene = 8.5) towards toluene and benzene vapour. Additionally, the ultra-low limit of detection of 9.5 ppb and sensitivity of 0.063 ppm-1 were ob-served towards xylene vapour, which indicated that the CuO-ZnO (1.0 wt%) heterostructure-based sensor can realize sub-ppb-level xylene concentration. The sensor disclosed excellent long-term stability in dry air and 40% relative humidity. The superior gas sensing characteristics could be ascribed to the superior surface area, the creation of p-n heterojunction, the robust chemical affinity, and the catalytic performance of p-type CuO on xylene vapour. The response mechanism towards xylene was also clarified.& COPY; 2023 Elsevier B.V. All rights reserved.
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