Palladium-Gold Alloy Nanowire-Structured Interface for Hydrogen Sensing
发表时间：2019-10-22
点击次数：
- 论文类型：
- 期刊论文
- 第一作者：
- Tang, Lili
- 通讯作者：
- Yu, G (reprint author), Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.
- 合写作者：
- Yu, Gang,Li, Xiaogan,Chang, Fangfang,Zhong, Chuan-Jian
- 发表时间：
- 2015-04-01
- 发表刊物：
- CHEMPLUSCHEM
- 收录刊物：
- SCIE
- 文献类型：
- J
- 卷号：
- 80
- 期号：
- 4
- 页面范围：
- 722-730
- ISSN号：
- 2192-6506
- 关键字：
- alloys; hydrogen; nanostructures; palladium; sensors
- 摘要：
- Understanding how the detailed nanoscale structure governs the interfacial interactions and reactivities is key to the exploration of nanostructured chemical sensors. We describe herein novel findings of an investigation of a palladium-gold alloy nanowire interface for hydrogen sensing. A dielectrophoretic growth pathway was utilized for controllable fabrication of the alloyed nanowires with minimum branching structures on a microelectrode device using controlled ratios of palladium and gold precursors in a two-step mechanism, a nucleation process initiated at a lower alternating current (AC) frequency followed by a growth process at a higher frequency up to 15MHz. The nanowires showed a reduced branching propensity and highly oriented 1D feature, with the bimetallic composition scaling linearly with the frequency. The nanowires exhibited excellent responses to hydrogen in concentrations as low as 0.5% by volume. The hydrogen-response characteristic represents an optimized balance of the gold-induced lattice expansion of palladium and hydrogen adsorption-induced phase and stress changes, a new insight into the sensing mechanism of the alloy nanowire. The mechanistic sensing details are also discussed in correlation with the growth mechanism, which provides a new insight into the synergy of the bimetallic composition of the alloy nanowires for the enhanced sensitivity for the detection of hydrogen.
- 是否译文：
- 否
