微波合成(Au)_核·(Ag)_壳纳米粒子及其共振散射光谱研究

Microwave Synthesis of (Au)_(core)·(Ag)_(shell) CompositeNanoparticles and Spectroscopic Study of Their Resonance Scattering

以柠檬酸化学还原法制备的金纳米粒子作晶种,采用微波高压液相合成技术,制备出分散性较好、规则球形的(Au)核·(Ag)壳复合纳米粒子。研究了(Au)核·(Ag)壳复合纳米粒子的紫外可见吸收光谱和共振散射光谱特性,在470nm处有最强共振散射峰,在404nm处产生一个吸收峰。结果表明,(Au)核·(Ag)壳复合纳米粒子的形成是导致470nm共振散射的根本原因。

Using gold nanoparticles made by chemical reduction with citric acid as the seed and sodium citrate as the reducer,(Au)core·(Ag)shell composite nanoparticles of regular spherical shape and good dispersity are prepared by means of liquid phase microwave highpressure technique.Researches on the characters of ultraviolet absorption spectrum and resonance scattering spectrum show that the strongest resonance scattering peak appears at 470 nm,and there is an absorption peak at 404 nm.The result proves that formation of (Au)core·(Ag)shell composite nanoparticles is the ultimate cause of the resonance scattering peak at 470 nm.