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Spatially controlled CdSe nanocrystal distribution in phase separated polymer blend films

Published online by Cambridge University Press:  17 March 2011

Harumi Asami ,
Soichiro Saita ,
Itaru Kamiya  and
Kenichi Yoshie
Harumi Asami
Affiliation:
Yokohama Research Center, Mitsubishi Chemical Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan
Soichiro Saita
Affiliation:
Yokohama Research Center, Mitsubishi Chemical Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan
Itaru Kamiya
Affiliation:
Yokohama Research Center, Mitsubishi Chemical Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan
Kenichi Yoshie
Affiliation:
Yokohama Research Center, Mitsubishi Chemical Corporation, 1000 Kamoshida-cho, Aoba-ku, Yokohama 227-8502, Japan
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Abstract

We report the fabrication and characterization of the self-assembled structure of tri-n-octylphosphine oxide (TOPO)-capped CdSe nanocrystals in binary polymer phase separated films of polystyrene (PS), poly(methyl methacrylate) (PMMA) and poly(2-vinylpyridine) (P2VP). These structures are formed via demixing of CdSe nanocrystals and binary polymer during spin coating. The nanocrystals preferentially segregate to the PS-rich phase in phase separated PS/PMMA and to the P2VP-rich phase in phase separated PS/P2VP, as shown by optical microscopy and photoluminescence images. For CdSe/PS/PMMA, we attribute the driving force for CdSe segregating to the PS-rich domain to the stronger attractive interaction of TOPO on PS with respect to PMMA due to polarity, and in the case of CdSe/PS/P2VP, segregating to the P2VP-rich domain to the interaction such as coordinate bonds being formed between pyridine groups and surface Cd atoms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 636: Symposium D – Nonlithographic and Lithographic Methods of Nanofabrication-From Ultralarge Scale , 2000 , D9.52.1
Copyright
Copyright © Materials Research Society 2001

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