Journal Article


Michael A. Morris
Apostolos Avgeropoulos
Konstantinos Ntetsikas
George Liontos
Andrew Houlton
David A Fulton
Benjamin R Horrocks
Andrew R Pike
Scott M D Watson
Sozaraj Rasappa
and 2 others



poly styrene self assembled monolayers sams room temperature silicon self assembly patterns block copolymer self assembly surface chemistry

Nanoscale silicon substrate patterns from self-assembly of cylinder forming poly(styrene)-block-poly(dimethylsiloxane) block copolymer on silane functionalized surfaces. (2016)

Abstract Poly(styrene)-block-poly(dimethylsiloxane) (PS-b-PDMS) is an excellent block copolymer (BCP) system for self-assembly and inorganic template fabrication because of its high Flory-Huggins parameter (χ ∼ 0.26) at room temperature in comparison to other BCPs, and high selective etch contrast between PS and PDMS block for nanopatterning. In this work, self-assembly in PS-b-PDMS BCP is achieved by combining hydroxyl-terminated poly(dimethylsiloxane) (PDMS-OH) brush surfaces with solvent vapor annealing. As an alternative to standard brush chemistry, we report a simple method based on the use of surfaces functionalized with silane-based self-assembled monolayers (SAMs). A solution-based approach to SAM formation was adopted in this investigation. The influence of the SAM-modified surfaces upon BCP films was compared with polymer brush-based surfaces. The cylinder forming PS-b-PDMS BCP and PDMS-OH polymer brush were synthesized by sequential living anionic polymerization. It was observed that silane SAMs provided the appropriate surface chemistry which, when combined with solvent annealing, led to microphase segregation in the BCP. It was also demonstrated that orientation of the PDMS cylinders may be controlled by judicious choice of the appropriate silane. The PDMS patterns were successfully used as an on-chip etch mask to transfer the BCP pattern to underlying silicon substrate with sub-25 nm silicon nanoscale features. This alternative SAM/BCP approach to nanopattern formation shows promising results, pertinent in the field of nanotechnology, and with much potential for application, such as in the fabrication of nanoimprint lithography stamps, nanofluidic devices or in narrow and multilevel interconnected lines.
Collections Ireland -> Trinity College Dublin -> PubMed

Full list of authors on original publication

Michael A. Morris, Apostolos Avgeropoulos, Konstantinos Ntetsikas, George Liontos, Andrew Houlton, David A Fulton, Benjamin R Horrocks, Andrew R Pike, Scott M D Watson, Sozaraj Rasappa and 2 others

Experts in our system

Michael A. Morris
University College Cork
Total Publications: 164
Apostolos Avgeropoulos
Trinity College Dublin
Total Publications: 5
Sozaraj Rasappa
University College Cork
Total Publications: 13