Optical microfibers decorated with PdAu nanoparticles for fast hydrogen sensing
Optical microfibers decorated with PdAu nanoparticles for fast hydrogen sensing
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DOI：
10.1016/j.snb.2010.09.018
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发表时间：
2010-11-26
影响因子：
8.4
通讯作者：
Villatoro, Joel
中科院分区：
文献类型：
--
作者：
Monzon-Hernandez, David;Luna-Moreno, Donato;Villatoro, Joel
提出了一种用于快速氢传感的PdAu纳米颗粒修饰光纤。通过简单地将传统电信光纤缩减到与导光波长相当的尺寸来制造光纤微纤维。然后，通过以低沉积速率(0.1埃/S)沉积PdAu层，在几毫米处涂覆一层岛状的PdAu层。然后用热退火工艺生长这些岛屿，直到形成复合纳米颗粒。沉积在光学微纤维上的PdAu纳米粒子在暴露在氢气中时会经历光学和物理变化。这引起了可逆的透射率变化，具有不寻常的类似脉冲的行为，这归因于导光的散射。这些器件有望在室温下检测低浓度氢(高达8%)，响应和恢复时间在几秒钟左右，即比许多其他利用纳米级现象的氢传感器更快。如果用合适的透气纳米颗粒来装饰光纤微纤维，那么对其他气体的传感也是可行的。(C)2010爱思唯尔B.V.保留所有权利。
Optical microfibers decorated with PdAu nanoparticles are proposed for fast hydrogen sensing. The optical microfibers were fabricated by simply tapering conventional telecommunications fiber down to dimensions comparable to the wavelength of the guided light. The optical microfibers were then coated over a few millimeters with a PdAu layer in island form by depositing the layer at low deposition rate (0.1 angstrom/s). Then the islands were grown with a thermal annealing process until composite nanoparticles were formed. The PdAu nanoparticles deposited on the optical microfibers experience optical and physical changes when they are exposed to hydrogen. This gives rise to reversible transmission changes with an unusual pulsed like behavior which is attributed to scattering of the guided light. The devices are promising for detecting low concentrations of hydrogen (up to 8%) at room temperature with response and recovery times on the order of seconds, i.e., faster than many other hydrogen sensors that exploit phenomena at the nanoscale. The sensing of other gases is also feasible if the optical microfibers are decorated with suitable gas-permeable nanoparticles. (C) 2010 Elsevier B.V. All rights reserved.