激光诱导银纳米颗粒薄膜和微结构

Laser-Induced Deposition of Silver Nanoparticles Films and Microstructures onto Glass Substrates

利用可见激光诱导化学沉积方法在玻璃基底上制备纳米银薄膜和微结构。玻璃样品池中装满柠檬酸钠和硝酸银的混合透明溶液,当一束可见连续激光正入射样品池一段时间后,在辐照区域的玻璃内壁上便可以形成一层光亮的银膜。银膜沉积的速度受到激光功率密度、激光波长、辐照时间以及混合溶液的浓度等条件的影响。利用X射线衍射、原子力显微镜和拉曼光谱仪等手段对制备的薄膜的成分、表面形貌和拉曼活性等性质进行了表征和分析。利用此方法制备的银膜具有良好的表面增强拉曼散射活性。同时,利用双光束干涉的方法在玻璃基底上诱导出不同周期的银纳米颗粒光栅。

A simple method to deposit silver thin films and microstructures onto glass substrates by visible laser irradiation has been investigated. Under laser irradiation on a glass sample cell filled with a mixed solution of sodium citrate and silver nitrate, a bright silver thin film can be produced on the surface of the glass in contact with the solution at the irradiated region. The growth rate of silver films is influenced by laser power density, laser wavelength, irradiation time, reactant concentration, etc. X-ray diffraction, atomic force microscopy and Raman spectrometer are used to investigate the characteristics, surface morphology and Raman activity of silver films. The prepared silver films exhibit excellent surface-enhanced Raman scattering activity. Furthermore, the silver relief gratings with period from several micrometers to several hundred nanometers are achieved on the surface of the glass by two-beam interference method.