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Fabrication of 2D ordered structure of self-assembled block copolymers containing gold nanoparticles

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Title: Fabrication of 2D ordered structure of self-assembled block copolymers containing gold nanoparticles
Authors: Dai, Chi-An1,2 polymer@ntu.edu.tw, Wu, Yu-Lin1, Lee, Yi-Huan2, Chang, Chun-Jie2, Su, Wei-Fang2
Source: Journal of Crystal Growth. Feb2006, Vol. 288 Issue 1, p128-136. 9p.
Subjects: Nanoparticles, Electron microscopy, Surface tension, Copolymers
Abstract: 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 5min, aggregation of nanodots and disruption of 2D ordered structure were resulted due to the swelling of PVP core by hydrazine. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract: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 5min, aggregation of nanodots and disruption of 2D ordered structure were resulted due to the swelling of PVP core by hydrazine. [Copyright &y& Elsevier]
ISSN:00220248
DOI:10.1016/j.jcrysgro.2005.12.055