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首页> 外文期刊>Nanotechnology >Atmospheric pulsed laser deposition and thermal annealing of plasmonic silver nanoparticle films
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Atmospheric pulsed laser deposition and thermal annealing of plasmonic silver nanoparticle films

机译：大气脉冲激光沉积和等离子体银纳米粒子膜的热退火

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摘要

A new method for pulsed laser deposition of plasmonic silver nanoparticle (NP) films in flowing gas at atmospheric pressure is described. The ablation was done using an excimer laser at 248 nm. Fast optical imaging shows that the ablation plume is captured by the flowing gas, and is expected to form a NP aerosol, which is carried 5-20 mm to the substrate. The dependence of the deposition rate on laser fluence, gas flow velocity, and target-substrate distance was investigated using electron microscopy and absorption spectroscopy of the deposited films. The NP films were annealed in argon and hydrogen at 400 degrees C, and in air for temperatures in the range 200 degrees C-900 degrees C, leading to strong enhancement, and narrowing of the surface plasmon resonance. The films were used for surface enhanced Raman spectroscopy of a 10-5 molar solution of Rhodamine 6G; films annealed in air at 400 degrees C were five times more sensitive than the as-deposited films.
机译：描述了一种在大气压下流动气体中脉冲激光沉积等离子体纳米颗粒（NP）膜的新方法。 使用在248nm处使用准分子激光完成消融。 快速光学成像表明消融羽流由流动的气体捕获，并且预期形成NP气溶胶，其将5-20mm送到基板上。 使用电子显微镜和沉积膜的吸收光谱研究了沉积速率对激光流量，气体流速和靶基质距离的依赖性。 NP膜在400℃下在氩气和氢气中退火，在200摄氏度范围内的温度下在空气中退火，导致强大的增强和表面等离子体共振的缩小。 薄膜用于10-5摩尔酚6g的表面增强拉曼光谱; 在400摄氏度下在空气中退火的薄膜比沉积的薄膜更敏感的五倍。

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