Fabrication of two-dimensional ordered structure of self-assembled block copolymer containing gold nanoparticles
Date Issued
2005
Date
2005
Author(s)
Wu, Yu-Lin
DOI
zh-TW
Abstract
The aim of this study was focusing on making a two-dimensional ordered structure with gold nanoparticles. Traditional top-down patterning methods like photolithography and e-beam lithography had shown to be time-consuming and expensive processes. In this study, a bottom-up method to fabricate an ordered nanodot with gold nanoparticles was proposed by using an amphiphilic block copolymer self-assembled into well-defined two/three dimensional structures.
A stripe-like and a spherical nano-structure containing gold nanoparticles can be made by using block copolymer such as PS-PMMA and PS-P2VP that were also synthesized in our Lab. The fabrication process of stripe-like structure involved two steps. The first step involves spin coating the copolymer on a substrate, then thermal annealing it into ordered structure by self-assembly. The second step was to apply gold nanoparticles selectively on PS domain to form highly ordered gold nanoparticles array. The fabrication process of a spherical structure was made by PS-P2VP which formed micelles in toluene. The nanodot array of micelle monolayer containing gold salts was made by dip-coating. The block copolymer micelles containing gold salts were used as nanoscale reactors for the in-situ synthesis of gold by chemical treatment of the film sample with hydrazine vapor.
A stripe-like and a spherical nanostructure containing gold nanoparticles were both observed either by AFM or by TEM. AFM was used successfully to evaluate the uniformity of stripe-like nanostructure coated on a silicon wafer before and after gold evaporation. TEM measurement of a spherical nanostructure showed that a monolayer of gold salts was reduced to one or a couple of gold nanoparticles inside the core volume of P2VP domain by nucleation and growth mechanism upon hydrazine vapor exposure. UV-vis spectrometer also show a characteristic surface plasmon absortion peak which demonstrate the effectiveness of the method in reducing gold salts.
Subjects
團聯共聚合物
反應離子蝕刻
微胞
原位還原
表面電將共振
amphiphilic block copolymer
ps-b-pmma
ps-b-p2vp,self-assembly
micelle
in-situ
nucleatoin and growth mechanism
nanodot
surface plasmon
Type
thesis