热处理条件对硅酸盐玻璃中原位形成银纳米颗粒的影响  

INFLUENCE OF ANNEALING CONDITIONS ON NANOPARTICLE SILVER FORMATION IN SITU IN SILICATE GLASS

作　　者：杨修春[1] 杜天伦[1] 李志会[1] 黄文旵[1] 

机构地区：[1]同济大学材料科学与工程学院,上海200092

出　　处：《硅酸盐学报》2006年第12期1481-1484,1490,共5页Journal of The Chinese Ceramic Society

基　　金：教育部留学回国人员科研启动费;上海市科委纳米技术专项基金(0452nm075);上海市科委基础研究重点(05JC14058)

摘　　要：用离子交换结合热处理法制备银(Ag)纳米颗粒–玻璃复合材料。用透射电镜、高分辨透射电子显微镜、Rutherford背散射谱和紫外–可见光吸收光谱研究了热处理条件对玻璃中原位形成Ag纳米颗粒的影响。结果显示:随着热处理温度升高,玻璃表面的Ag原子逐渐向玻璃内部扩散,其表面摩尔浓度逐渐降低。提高热处理温度和延长热处理时间都有利于提高玻璃中Ag纳米颗粒的体积分数。空气中,高温热处理高掺Ag量的白玻璃样品时发生二次成核,因此,Ag纳米颗粒尺寸呈双峰分布。Ag纳米颗粒尺寸的双峰分布导致其等离子体共振吸收峰出现双峰。在氢气气氛中,在250℃热处理2min,即可在玻璃中形成大量Ag纳米颗粒,颗粒尺寸小于空气中高温热处理样品的尺寸,从而引起表面等离子体共振吸收峰发生蓝移。Silver （Ag） nanoparticle-glass composites were synthesized by the ion exchange and subsequent thermal treatment method. Transmission electron microscopy, high resolution transmission electron microscopy, Rutherford backscattering spectroscopy, and ultraviolet-visible spectroscopy were used to study influences of annealing conditions on the formation ofAg nanoparticles in situ in silicate glasses. The results indicate that Ag molar concentration in the surface layer of the samples decreased with elevating thermal treatment temperature due to interior diffusion of surface Ag atoms. Higher annealing temperature and longer annealing time favored an increase of the volume fraction of Ag nanoparticles in silicate glass. Bi-peak distributions of Ag nanoparticle sizes appear due to the twice nucleation during annealing of the high Ag-doped white glasses in air at a higher temperature, which induces surface plasma resonance bi-peaks. When Ag-doped white glasses are treated in a hydrogen atmosphere, silver nanoparticles can form at 250℃ in 2 min, and the mean particle size is smaller than that obtained from thermal treatment in air, which induces a blue shift of surface plasma resonance absorption.

关 键 词：银纳米颗粒 热处理 表面等离子体共振吸收双峰 蓝移 

分 类 号：TB333[一般工业技术—材料科学与工程]