期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 297, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2023.127352
关键词
SMOs; CuO; ZnO; Gas sensors; Dual-selectivity; BTEX
In this study, n-type ZnO and p-type CuO nanostructures were synthesized using a hydrothermal method. The ZnO-NaOH-based sensor showed temperature dual-mode selectivity towards benzene and xylene vapours with high sensitivity and low detection limit.
The selective detection of gaseous benzene, toluene, ethylbenzene, and xylene (BTEX) is challenging due to their similar molecular structures. In addition, BTEX vapours are extremely hazardous and carcinogenic. Thus, in the current study, n-type ZnO and p-type CuO nanostructures were synthesized utilizing various bases by a simple hydrothermal method. Among the tested sensors, the ZnO-NaOH-based sensor displayed a temperature dualmode selectivity toward benzene with responses (R-a/R-g) of 2.5 and 24 at 5 and 100 ppm, respectively at 75 degrees C, and R-a/R-g approximate to 142 toward xylene vapour at 100 ppm at an operating temperature of 150 degrees C. While the CuObased sensors showed poor response, sensitivity and selectivity towards tested analytes. Moreover, the ZnO-NaOH based sensor revealed enormous sensitivity of 1.21 ppm(-1) and low limit of detection (LoD) of 0.018 ppm (i.e., 18 ppb) toward xylene. The ultra-sensitivity, selectivity, low LoD of ZnO-NaOH based sensor toward benzene and xylene are associated with the improved VO observed in the in-situ photoluminescence and electron paramagnetic resonance studies, and as well as the x-ray photoelectron spectroscopy analyses. The ZnO-NaOHbased sensor, which was stored for roughly 18 months (547 days), demonstrated a reliable repeatability and long-time operation stability for 22 h exposure to xylene. The superior sensitivity, stability, and selectivity indicate openly that the strategy of using various bases is a striking method for fabricating a temperature dual-mode selectivity for the detection of benzene and xylene vapours.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据