Hydrogen sensing properties of Pt/Pd bimetal decorated on highly hydrophobic Si nanowires
Hydrogen sensing properties of Pt/Pd bimetal decorated on highly hydrophobic Si nanowires
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DOI：
10.1016/j.ijhydene.2016.04.124
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发表时间：
2016-07-06
影响因子：
7.2
通讯作者：
Chung, Gwiy-Sang
中科院分区：
文献类型：
--
作者：
Hassan, Kamrul;Uddin, A. S. M. Iftekhar;Chung, Gwiy-Sang
本文描述了通过使用简便的金属辅助化学蚀刻和脉冲激光沉积（PLD）工艺合成Pt/Pd双金属装饰的高疏水性粗糙硅纳米线（Si NW）。此外，还研究了 Si 纳米线作为新的氢 (H-2) 检测矩阵的潜力。 Pt/Pd 双金属以半致密结构的离散超薄膜方式涂覆在基底平台上，并沿着垂直站立和半致密分布的粗糙 Si NW 簇的长度。由此产生的结构在 H-2 传感性能方面表现出显着的优势，例如 1-40,000 ppm 的大检测范围、近 5.02% 的高响应幅度以及在 75 摄氏度的最佳工作温度下 7/7 秒至 10,000 ppm (1 vol%) 氢气浓度的快速响应恢复时间。观察到的快速响应恢复时间的特性可能与氢引起的 Pt/Pd 功函数变化的增强有关。 双金属装饰的硅纳米线（Pt/Pd-Si 纳米线），被配置为由许多纳米线簇组成的阵列矩阵，两个电极之间的距离可变。最后，所制造的传感器对（1 vol%）氢气浓度表现出优异的重复性。 (C) 2016 氢能源出版物有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
This paper describes the synthesis of Pt/Pd bimetal decorated highly hydrophobic rough silicon nanowires (Si NWs) by using a facile metal assisted chemical etching and pulse laser deposition (PLD) process. In addition, the potential of the Si NWs as a new hydrogen (H-2) detection matrix was investigated. The Pt/Pd bimetal was coated as a discrete ultra thin film manner in a semi-dense configuration over the basal podium and along the length of vertical-standing and semi-densely distributed rough Si NW clusters. The resulting structure showed significant advantages in H-2 sensing performances such as a large detection range of 1-40,000 ppm, high response magnitude of nearly 5.02%, and fast response-recovery time of 7/7 s to 10,000 ppm (1 vol%) hydrogen concentration at an optimum operating temperature of 75 degrees C. The observed characteristics of fast response recovery time could relate to the enhanced hydrogen-induced changes in the work function of the Pt/Pd bimetal decorated Si NWs (Pt/Pd-Si NWs), which were configured as an array matrix comprising of many nanowire clusters with variable distances between the two electrodes. Finally, the fabricated sensor showed excellent repeatability towards (1 vol %) hydrogen concentration. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.