A one-pot method to prepare gold nanoparticle chains with chitosan

被引:61
作者
Wu, Linlin [1 ]
Shi, Chunsheng [1 ]
Tian, Liangfei [1 ]
Zhu, Jin [1 ]
机构
[1] Nanjing Univ, Sch Chem & Chem Engn, State Key Lab Coordinat Chem, Dept Polymer Sci & Engn, Nanjing 210093, Peoples R China
关键词
D O I
10.1021/jp076733o
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A biocompatible, water-soluble, lower molecular weight chitosan has been used for, via a one-pot high-temperature refluxing strategy, the simultaneous synthesis and assembly of gold nanoparticles. Transmission electron microscopy (TEM) and ultraviolet-visible-near-infrared (UV-vis-NIR) extinction spectra allowed us to identify the existence of nanoparticle linear aggregates. Importantly, through such a preparation procedure, the chain length of the nanoparticle aggregates could be tuned by facile adjustment of the reaction reagent ratio. Further, the growth and assembly processes of gold nanoparticles were studied by quenching the intermediate reaction solutions with an ice-water bath. The structure evolution proceeded through a two-stage process: initial generation of isolated nanoparticles, followed by the interconnection of nanoparticles into an aggregated morphology. A mechanism based on the nonuniform distribution of capping ligands is Z proposed to account for the one-dimensional chain structure formation.
引用
收藏
页码:319 / 323
页数:5
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