(Ag)_核·(Au)_壳复合纳米粒子的制备

以银原子团簇作晶种,采用微波高压液相合成法制备了分散性好、规则球形的(Ag)核·(Au)壳复合纳米粒子。研究了(Ag)核·(Au)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。结果表明,液相(Ag)核·(Au)壳复合纳米粒子和高压微波合成的液相金纳米粒子的最强共振散射峰均在580nm处,它们的吸收光谱图相似,最大吸收分别在518.5nm和524.8nm。

Preparation of (Ag)core · (Au)shell Composite Nanoparticles

Using Ag clusters as crystal seed and sodium citrate as reducing agent, (Ag)core·(Au)shell composite nanoparticles in liquid were prepared by means of microwave high pressure method. The (Ag)core·(Au)shell composite nanoparticles with regular spherical morphology are highly dispersed. The UV and resonance scattering spectroscopic studies of (Ag)core·(Au)shell nanoparticles were carried out. The maximum resonance scattering peak of (Ag)core·(Au)shell in liquid appears at 580 nm, which is identical with that of Au nanoparticles in liquid prepared by the same method. The absorption peak of (Ag)core·(Au)shell nanoparticles in liquid is at 518.5 nm, where as the absorption peak of Au nanoparticles in liquid is at 524.8 nm. They have similar UV-Vis absorption spectra.