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Influence of Capping Ligands on the Self‐organization of Gold Nanoparticles into Superlattices from CTAB Reverse Micelles
Author(s) -
Lin Jun,
Zhou WeiLie,
Everett Carpenter,
O'Connor Charles
Publication year - 2002
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20020200204
Subject(s) - chemistry , colloidal gold , nanoparticle , micelle , transmission electron microscopy , self assembly , nanochemistry , gold colloid , chemical engineering , colloid , nanotechnology , inorganic chemistry , nuclear chemistry , organic chemistry , aqueous solution , materials science , engineering
Gold nanoparticles with size 3–10 nm (diameter) were prepared by the reduction of HAuCl 4 in a CTAB/octane + 1‐butanol/H 2 O reverse micelle system using NaBH 4 as the reducing agent. The as formed gold nanoparticle colloid was characterized by UV/vis absorption spectrum and transmission electron microscopy(TEM). Various capping ligands, such as alkylthiols with different chain length and shape, trioctylphosphine (TOP), and pyridine are used to passivate the gold nanoparticles for the purpose of self‐organization into superstructures. It is shown that the ligands have a great influence on the self‐organization of gold nanoparticles into superlattices, and dodecanethiol C 12 H 25 SH is confirmed to be the best ligand for the self‐organization. Self‐organization of C 12 H 25 SH‐capped gold nanoparticles into 1D, 2D and 3D superlattices has been observed on the carbon‐coated copper grid by TEM without using any selective precipitation process.