盐酸羟胺络合法制备银溶胶及表面增强拉曼基底

报道了一种制备银溶胶的新方法.用紫外-可见光谱和透射电镜研究了银纳米粒子的形成过程、粒子形状及粒径分布.紫外光谱结果表明,在还原剂中加入碘化银溶胶后立即形成银纳米粒子,开始时粒子的粒径较小,很快聚集成较大的粒子.随着反应的进行,较大的粒子又逐渐碎裂为较小的粒子.同时,粒子的粒径分布逐渐变窄,说明银纳米粒子的形成过程也是粒子粒径均化的过程.透射电镜的研究结果表明,银纳米粒子为形状均一的球形,平均粒径约35nm.将这种银纳米粒子转移到固体基片上可得到活性较高的表面增强拉曼(SERS)基底.

Preparation of Silver Colloid by Hydrochlorinated Hydroxy Amine Method and Its Surface Enhanced Raman Substrate

A new method--hydrochlorinated hydroxy amine method for preparing silver colloid was reported, and the formation process of silver nanoparticles was studied by UV Vis spectroscopy and TEM. From the results, we can see the particle formation process is as follows: small particles were formed at the beginning of the reaction, and then they aggregate to large ones rapidly, then the large particles decomposed to small ones gradually. The TEM images showed directly the same process as the results from the UV Vis spectra, indicating that the particle size distribution became more and more uniform. In addition, we transferred the Ag nanoparticles to the glass slide by electrostatic interaction to produce SERS active substrates. Strong SERS signals can be obtained on such substrates.