Fabrication of 2D Ordered Structure of Self-Assembled Block Copolymers Containing Gold Nanoparticles
Journal
Journal of Crystal Growth
Journal Volume
288
Journal Issue
1
Pages
128-136
Date Issued
2006
Author(s)
Abstract
Two-dimensional (2D) ordered structure of metal or semiconducting nanoparticles has many applications in areas of optoelectronic and biomedical technologies. Traditional top-down patterning methods like photolithography and e-beam lithography has shown to be time-consuming and expensive processes. In this study, a bottom-up method to fabricate an ordered nanodot structure with entirely wet-chemical procedures is proposed by using an amphiphilic block copolymer self-assembled into well defined two/three-dimensional structures with gold nanoparticles evenly distributed in the hydrophilic domain of the copolymer. The nanodot array of micelle monolayer containing Au salts on substrates can be made by a simple dip coating process. The block copolymer micelles containing gold salts on substrates were used as nanoscale reactors for the in-situ synthesis of metal nanoparticles by chemical treatment of the film sample with hydrazine vapor. AFM was used to evaluate the uniformity of nanodots coated on a silicon wafer before and after hydrazine reduction. Transmission electron microscopy measurement showed that a monofilm of gold salts was reduced to one or a couple of gold nanoparticles inside the core volume of PVP domain by nucleation and growth mechanism upon hydrazine vapor exposure. For an exposure time longer than 5 min, aggregation of nanodots and disruption of 2D ordered structure were resulted due to the swelling of PVP core by hydrazine.
Type
journal article
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