激光诱导玻璃内部金纳米颗粒的析出及光谱

使用钛宝石飞秒激光引发和热处理相结合，实现了在含有金离子的硅酸盐玻璃内部，有空间选择性地析出金纳米颗粒。对吸收光谱的研究表明，随着热处理温度的升高，吸收峰强度增大且红移；随着激光功率密度的增大，金纳米颗粒也增大。在特定的激光和热处理条件作用下，可以在玻璃内部有空间选择性的使金离子还原后聚集，形成金纳米颗粒，具有量子尺寸效应。改变激光功率和热处理温度可以控制所析出的金属纳米粒子的尺寸，从而实现多色显示，飞秒激光诱导金纳米颗粒具有稳定性，颜色具有持久性。

Space-Selective Precipitation of Gold Nanoparticles in Glass Induced by Femtosecond Laser and Spectra Properties

Space selective gold nanoparticles were precipitated in silicate glasses containing gold ions by irradiation with Ti∶sapphire femtosecond pulsed laser and heat treatment. Absorption spectra measurements show that the plasmon absorption peak of the precipitated gold nanoparticles shift red slightly and their intensities increase with the increasing of treatment temperatures; Also, average size of nanoparticles increases along with increase in laser power density. This means that under the given laser irradiation and heat treatment conditions, gold ions inside the glass can be reduced to Au atoms and then accumulate to form gold nanoparticles with quantum size effect. According to the laser irradiation profiles, the sizes and multicolor display of gold nanoparticles can be controlled by changing the power density of irradiation. Au nanoparticles are stable, and their color is fadeless at room temperature.