金种子生长法制备小尺寸金纳米星

Preparation of Gold Nanostars with Small Diameters

本研究采用金种子生长法,通过优化氯金酸溶液用量、生长液pH值以及反应温度等条件,制备出一种全新的小尺寸金纳米星(Au-NSs)颗粒,方法具有可控、稳定、简单、Au-NSs粒径均一等优点。紫外-可见-近红外(UV-Vis-NIR)光谱和透射电子显微镜(TEM)检测表明,该方法制备出的Au-NSs的粒径在40nm左右,远小于常规方法制得的Au-NSs(~80nm)。最终制备条件确定为:生长液、金种溶液和抗坏血酸(AA)的体积比为600∶9∶7;生长液的pH≈3.05;制备Au-NSs的温度条件为先冰浴加入金种,回升至室温后加入AA还原。

Small size gold nanostars（Au-NSs）were prepared with seed growth method.Ultraviolet-visible and near infrared spectrophotometric（UV-Vis-NIR）and transmission electron microscopic（TEM）measurements showed that the size of Au-NSs prepared by this method is about 40 nm,which is much smaller than the size of conventional Au-NSs.The optimized conditions to prepare small size Au-NSs are determined as follows∶the volume of growth solution∶the volume of gold seeds∶the volume of L-ascorbic acid（AA）is 6 000μL∶90μL∶70μL;the pH value of growth solution is 3.05;adding gold seeds solution into growth solution in ice bath before the AA was added to the mixture at room temperature.