材料科学
纳米线
纳米颗粒
吸附
选择性
制作
纳米技术
飞秒
电极
化学气相沉积
光电子学
化学工程
灵敏度(控制系统)
激光器
化学
催化作用
光学
物理化学
医学
生物化学
替代医学
物理
工程类
病理
电子工程
作者
Shoutian Ren,Guanghua Fan,Shiliang Qu,Qiang Wang
摘要
For sensitive detection of H2, ZnO nanowires networks decorated with photo-decomposed Pd nanoparticles were fabricated between femtosecond laser-writing interdigitated electrodes by chemical vapor deposition method. When H2 concentration is increased from 20 to 4000 ppm at room temperature, sensitivity of the sample is increased from 3.7% to 1017.9%. The high sensitivity can be explained by considering the reaction between the adsorbed O2- and the disassociated H atoms facilitated by Pd nanoparticles. This mechanism is further supported by the H2 response results under UV light illumination, which can reduce the amount of O2- on the ZnO surface, leading to depressed sensitivity. The sensor also shows high selectivity, long-term stability, and ultra-low power consumption of nanowatt level, due to the novel fabrication process.
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