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Kinetic Simulation of Gold Nanorod Growth in Solution Based on Optical Spectra
Ying-ying Wang,Bo-xuan Li,Silvije Vdovic,Xue-fei Wang*,An-dong Xia
Author NameAffiliationE-mail
Ying-ying Wang The State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China  
Bo-xuan Li The State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China  
Silvije Vdovic The State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China  
Xue-fei Wang* The State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China wangxf@iccas.ac.cn 
An-dong Xia The State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China  
Abstract:
By monitoring the time evolution of the optical absorption spectrum corresponding to dy-namic information of aspect ratio (AR) and volume, we succeeded in following the growth kinetics of gold nanorods. The results indicate that the rods growth consists of two stages: seeds develop into rods with a fast AR increase and the rods grow big with constant AR. Here, a charge transfer model, involving positive charge transfer from Au(I) to seed and neu-tralization by electron from ascorbic acid, has been introduced to explain the autocatalysis mechanism of rod growth. The good agreement between the numerical simulation based on this moldel and experimental results supports the proposed mechanism.
Key words:  Gold nanorod, Growth mechanism, Charge transfer
FundProject:
溶液中金纳米棒形成过程的光谱动力学分析
王营营,李博轩,Silvije Vdovic,王雪飞*,夏安东
摘要:
通过动态光谱跟踪溶液中金纳米棒的尺度和长径比(AR)的变化,成功地获取粒子的生长过程的动态数据. 该过程分为两步:种子快速形成棒状粒子;棒状粒子在一定AR下的生长. 通过分析体系中的一价金、金粒子和抗坏血酸之间的电荷转移过程,建立了金纳米棒生长过程的电荷转移模型,并很好地解释了动态光谱的实验数据.
关键词:  金纳米棒,生长机制,电荷转移
DOI:10.1088/1674-0068/25/02/135-141
分类号: