Nano-Scale Patterning by Gold Self-Assembly on PS-PB-PS Triblock Copolymer Thin Film Templates

PS-PB-PS 삼블럭 공중합체 박막형판에서의 금의 자기응집에 의한 Nano-Scale 패턴형성

  • Kim, G. (Department of Materials Science and Engineering Stevens Institute of Technology Hoboken) ;
  • Libera, M. (Department of Materials Science and Engineering Stevens Institute of Technology Hoboken)
  • Published : 1999.03.31

Abstract

This paper describes how the gold particles self assemble on the specific phase on the microphase separated block copolymer thin film and form a well ordered patterns. For this study, polystyrene-polybutadiene-polystyrene (PS-PB-PS) triblock copolymer (30wt % PS) thin films (${\sim}100nm$) having a cylindrical morphology were cast from 0.1wt% toluene solution to be used as polymer thin film templates. The films having either vertical PS cylinders or in-plane PS cylinders in PB matrix from each different solvent evaporation condition were obtained. Cross-sectional transmission electron microscopy(TEM) was used to study the surface and bulk morphologies of block copolymer thin films. Small amount of gold particles was evaporated on a block copolymer thin film template to obtain a nano-scale pattern. When an as-cast thin film template was used, gold particles preferentially self assemble on the low surface tension PB phase and a relatively well ordered pattern in nano-scale was produced. However, after the formation of a low surface energy PB rich layer upon annealing, a gold self-assembled pattern was not observed.