纳米棒
响应度
高分辨率透射电子显微镜
材料科学
膜
二氧化氮
分析化学(期刊)
透射电子显微镜
纳米技术
化学工程
化学
光电子学
光电探测器
色谱法
生物化学
有机化学
工程类
作者
Shao‐Yu Chu,Mu-Ju Wu,Tsung-Han Yeh,Ching-Ting Lee,Hsin-Ying Lee
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2023-12-27
卷期号:9 (1): 118-125
标识
DOI:10.1021/acssensors.3c01742
摘要
In this work, a vapor cooling condensation system was utilized to deposit various amounts of p-type gold-black nanoparticles (NPs) onto the surface of n-type gallium oxide (Ga2O3) nanorods forming p-n heterojunction-structured sensing membranes of nitrogen dioxide (NO2) gas sensors. The role and the sensing mechanism of the various gold-black NP-decorated Ga2O3 nanorods in NO2 gas sensors were investigated. The coverage and atomic percentage of the sensing membranes were observed using high-resolution transmission electron microscopy (HRTEM) measurements and energy-dispersive spectroscopy (EDS), respectively. For the NO2 gas sensor using the sensing membrane of 60 s-deposited gold-black NP-decorated Ga2O3 nanorods under a NO2 concentration of 10 ppm, the highest responsivity of 5221.1% was obtained. This result was attributed to the spillover effect and the formation of the p-n heterojunction, which increased more ionized-oxygen adsorption sites and promoted the reaction between NO2 gas and Ga2O3 nanorods. Furthermore, the NO2 gas sensor could detect the low NO2 concentration of 100 ppb and achieved a responsivity of 56.9%. The resulting NO2 gas sensor also exhibited excellent selectivity for detecting NO2 gas, with higher responsivity at a NO2 concentration of 10 ppm compared with that of the C2H5OH and NH3 concentrations of 100 ppm.
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