Single-Crystal Pd and its Alloy Nanowires for Plasmon Propagation and Highly Sensitive Hydrogen Detection
Single-Crystal Pd and its Alloy Nanowires for Plasmon Propagation and Highly Sensitive Hydrogen Detection
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用于等离子传播和高灵敏氢检测的单晶钯及其合金纳米线
DOI：
10.1002/adom.201300413
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发表时间：
2014-02-01
影响因子：
9
通讯作者：
Zhuang, Songlin
中科院分区：
文献类型：
--
作者：
Gu, Fuxing;Zeng, Heping;Zhuang, Songlin
在这项工作中，等离子体激元的传播和高灵敏度的氢传感表现在单晶钯及其合金纳米线，基于倏逝波耦合技术，使用光纤锥。在MgF 2衬底上的Pd纳米线的等离子体传播损耗被测量为类似于2dB/m（在635 nm处）。使用纳米线的悬浮方案，在空气中的传播损耗降低到类似于0.6 dB/m。利用合金化技术，单晶钯银纳米线的制造和表现出减少和可调的传播损耗。此外，Pd纳米线用于等离子体气体传感，对3.6%的氢气具有类似于11 dB的幅度灵敏度，这远高于光子纳米线传感器。浓度检测限约为0.2%，低于光子纳米线传感器和大多数表面等离子体共振传感器。采用单晶PdAu合金纳米线抑制了Pd纳米线在氢敏中的滞后效应。这项工作可能会得到广泛的应用，从传感和集成电路到材料研究。
In this work plasmon propagation and highly sensitive hydrogen sensing are demonstrated in single-crystal Pd and its alloy nanowires, based on an evanescent wave coupling technique using optical fiber tapers. The plasmon propagation losses of Pd nanowires on an MgF2 substrate are measured to be similar to 2 dB/m (at 635 nm). Using a suspension scheme of the nanowire, the propagation losses decrease to similar to 0.6 dB/m in air. Utilizing an alloying technique, single-crystal PdAg nanowires are fabricated and exhibit decreasing and tunable propagation losses. Furthermore, Pd nanowires are used for plasmonic gas sensing with amplitude sensitivity of similar to 11 dB to 3.6% hydrogen gas, which is much higher than those in photonic nanowire sensors. The concentration detection limit is about 0.2%, which is lower than those in photonic nanowire sensors and most surface plasmon resonance sensors. The hysteresis effect of the Pd nanowire in hydrogen sensing is suppressed by using single-crystal PdAu alloy nanowires. This work may find widespread application, ranging from sensing and integrated circuits to materials research.