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Fabrication of Stimulus-Responsive Polymeric Nanostructures by Proximal Probes

Published online by Cambridge University Press:  11 February 2011

Sang-Jung Ahn ,
Woo-Kjung Lee  and
Stefan Zauscher
Sang-Jung Ahn
Affiliation:
Department of Mechanical Engineering and Materials Science, 144 Hudson Hall, Box 90300, Duke University, Durham, North Carolina, 22708
Woo-Kjung Lee
Affiliation:
Department of Mechanical Engineering and Materials Science, 144 Hudson Hall, Box 90300, Duke University, Durham, North Carolina, 22708
Stefan Zauscher
Affiliation:
Department of Mechanical Engineering and Materials Science, 144 Hudson Hall, Box 90300, Duke University, Durham, North Carolina, 22708
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Abstract

The triggered control of interfacial properties on the nanometer scale holds significant promise for actuation in bio-nanotechnology applications where polymeric actuators may manipulate the transport, separation, and detection of biomolecules. To fabricate patterned, stimulus-responsive polymer brushes we have developed several methods that combine surface initiated polymerization (SIP) with dip-pen nanolithography (DPN). Surface-confined, stimulus-responsive polymer brush nanopatterns were fabricated by amplification of DPN patterned, self-assembled monolayers of 16-mercaptohexadecanoic acid on gold surfaces by SIP of N-isopropylacrylamide (NIPAAm). While free radical polymerization yielded only short polymer brushes (DP<50), atom transfer free radical polymerization (ATRP) produced thick, uniform polymer brushes. For free radical polymerization the thickness of the polymer brush layer is a function of the lateral feature size and the initiator density and is maximal at pattern boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 735: Symposium C – Bioinspired Nanoscale Hybrid Systems , 2002 , C11.51
Copyright
Copyright © Materials Research Society 2003

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References

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