步步种子法制备形态及尺寸可控的花状金纳米粒子  

Preparation of Flower-like Gold Nanoparticle with Controlled Morphology and Size through Step by Step Seeding Approach

作　　者：杨艳敏[1] 董前民[1] 梁培[1] 舒海波[1] 王乐[1] 

机构地区：[1]中国计量学院光学与电子科技学院,浙江杭州310018

出　　处：《分析测试学报》2014年第2期222-226,共5页Journal of Instrumental Analysis

基　　金：国家自然科学基金项目(61006051,61177050);浙江省自然科学基金项目(Y407370,Y1110777)

摘　　要：系统研究了以20 nm球形金纳米粒子为种子,抗坏血酸和HAuCl4为生长溶液,利用步步种子法制备花状金纳米粒子的方法。实验结果表明,抗坏血酸可以快速有效地使HAuCl4还原成Au0单体,并在反应溶液中形成小的金纳米粒子;采用步步种子法以抗坏血酸还原HAuCl4,通过球形金纳米种子的核生长过程使种子粒径增大,继而通过二次成核过程使金纳米粒子表面出现突起,最终形成粒径均一可控的花状金纳米粒子结构,通过改变抗坏血酸和种子溶液的加入量可以得到不同粒径及形态的花状金纳米粒子。该粒子由于较大的表面粗糙度和分支上的特殊电磁场效应,从而在表面增强荧光光谱中表现出良好的增强效果。The step by step seeding approach for preparation of gold nanoflowers was investigated systematically,in which 20 nm gold nanoparticles were used as the seeds and a mixture of HAuCl4 and ascorbic acid as growth solution.In this seeding approach,ascorbic acid promoted the rapid reduction of HAuCl4 and the rapid formation of small Au particles in the growth solution.The attachment of the small particles on the seed surface contributed to the growth of the nanoflowers.Ascorbic acid promoted the rapid reduction of HAuCl4 in this seeding approach.In the first two steps,the size of the seeds increased with isotropic growth,and in the last two steps,some branches on the seeds surface grew through the secondary nucleation.Finally,a uniform and controllable gold nanoflower formed by this seeding method.Gold nanoflower showed good properties on the surface enhanced fluorescence spectroscopy due to its larger surface roughness and special electromagnetic fields of the branch.

关 键 词：金纳米花 种子生长法 UV-VIS光谱 荧光增强 

分 类 号：O657.3[理学—分析化学] O614[理学—化学]