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A Simple Method to Self-Assemble Two-dimensional and Three-dimensional Superlattices of Gold Nanoparticles

Published online by Cambridge University Press:  01 February 2011

Tao Fu ,
Hai-Yan Qin ,
Wen-Jiang Li  and
Sailing He
Tao Fu
Affiliation:
adobie.fu@gmail.com, Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Hangzhou, 310058, People's Republic of China
Hai-Yan Qin
Affiliation:
hattieqin@gmail.com, Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Hangzhou, 310058, People's Republic of China
Wen-Jiang Li
Affiliation:
liwj@coer.zju.edu.cn, Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Hangzhou, 310058, People's Republic of China
Sailing He
Affiliation:
sailing@zju.edu.cn, Centre for Optical and Electromagnetic Research, Department of Optical Engineering, Hangzhou, 310058, People's Republic of China
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Abstract

Citrate-capped gold nanoparticles with narrow diameter distribution were prepared by the reduction of chloroauric acid with borohydride. After the gold nanoparticles were transferred to toluene solution through ligand conformation change, close-packed two-dimensional nanocrystal lattices were obtained on transmission electron microscopy (TEM) copper grids by evaporating approximately 10 μL of concentrated particle dispersion. The formation of the thiolate gold nanoparticles was investigated by UV-visible absorption spectroscopy and FTIR spectra. The 2D Fourier transform power spectra of the monolayer confirmed the supperlattices' hexagonal symmetry. Furthermore, long-range-ordered bilayer superlattices, of which the nanoparticles in the top layer piled on the ones in the bottom layer, could also be observed by transmission electron microscopy.

Keywords

self-assemblyAunanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1056: Symposium HH – Nanophase and Nanocomposite Materials V , 2007 , 1056-HH03-01
Copyright
Copyright © Materials Research Society 2008

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