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Name (Title):
Chithra Parayalil (MANA researcher, Supermolecules group)
Affiliation:
Supermolecules Group, WPI Research Center for Materials
Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS)
Address:
1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Email: CHITHRA.Parayalil@nims.go.jp
Home Page:
Presentation Title:
Hierarchical self-assembly of OPV at the air-water interface
Abstract:
Oligo-(paraphenylenevinylene) based molecules equipped with functional moieties which
assist in molecular recognition, can self-assemble giving rise to supramolecular architectures with
well-defined morphology by means of non-covalent interactions. In this regard it is important to
have control over the self-organization process at different levels of hierarchy as the function and
the application depends on the level of organization. Extended conjugation in OPVs result in
electronic mobility and hence are good candidates for electronic and optoelectronic applications.
However the efficiency of many electronic devices based on π- conjugated systems depends on
the quality, homogeneity and morphology of the thin films. The preparation and study of thin
films based on organic materials are of great interest in many science and technology fields. For
example, the formation and transfer of well-ordered functional molecules from thin films to solid
surfaces, find use in several nanotechnology applications such as molecular sensors, electronic
and optoelectronic devices, non-linear optical properties, conducting and semiconductor organic
materials.
Figure: a) Various kinds of interactions possible in OPV and b) uniform fibers of OPV formed at air-water interface.
Thin films on flat substrates can be prepared by spin coating technique, but the homogeneity
and morphology of such films are usually of low quality. One possible approach towards the
preparation of thin films with controlled structure and morphology is the Langmuir-Blodgett
technique, which allows to prepare thin films at the air-water interface. In this context we have
investigated the self-assembly of OPV molecule at the air-water interface at different conditions
and various aspects will be presented.
References:
1. a) F. J. M. Hoeben, P. Jonkheijm, E. W. Meijer, A. P. H. J. Schenning, Chem. Rev. Vol. 105
(2005), 1491-1546; b) A. Ajayaghosh, V. K. Praveen, Acc. Chem. Res. Vol. 40 (2007), 644-
656.
2. a) K. Ariga, K. Kunitake, Acc. Chem. Res. Vol. 31 (1998), 371-378.
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Poster Session PM-12