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Fabrication of Polydiacetylene Nanocrystals Deposited with Silver Nanoparticles for a Nonlinear Optical Material

Published online by Cambridge University Press:  01 February 2011

Tsunenobu Onodera ,
Hidetoshi Oikawa ,
Hitoshi Kasai ,
Hachiro Nakanishi  and
Takashi Sekiguchi
Tsunenobu Onodera
Affiliation:
Nanomaterials Laboratory, National Institute for Materials Science, Namiki 1–1, Tsukuba 305–0044, JAPAN Japan Science and Technology Agency/ Core Research for Evolutional Science and Technology (JST/CREST), Honcho 4–1–8, Kawaguchi 332–0012, JAPAN
Hidetoshi Oikawa
Affiliation:
Nanomaterials Laboratory, National Institute for Materials Science, Namiki 1–1, Tsukuba 305–0044, JAPAN Japan Science and Technology Agency/ Core Research for Evolutional Science and Technology (JST/CREST), Honcho 4–1–8, Kawaguchi 332–0012, JAPAN
Hitoshi Kasai
Affiliation:
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2–1–1, Aoba-ku, Sendai 980–8577, JAPAN Japan Science and Technology Agency/ Core Research for Evolutional Science and Technology (JST/CREST), Honcho 4–1–8, Kawaguchi 332–0012, JAPAN
Hachiro Nakanishi
Affiliation:
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2–1–1, Aoba-ku, Sendai 980–8577, JAPAN Japan Science and Technology Agency/ Core Research for Evolutional Science and Technology (JST/CREST), Honcho 4–1–8, Kawaguchi 332–0012, JAPAN
Takashi Sekiguchi
Affiliation:
Nanomaterials Laboratory, National Institute for Materials Science, Namiki 1–1, Tsukuba 305–0044, JAPAN
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Abstract

Noble metal-coated polydiacetylene (PDA) nanocrystals are expected to enlarge effective third-order nonlinear optical susceptibility, owing to the enhancement of optical electric field induced by localized surface plasmon. The surface of PDA nanocrystals was decorated with silver nanoparticles, and the linear optical properties were investigated. The well-defined PDA nanocrystals were first prepared by the conventional reprecipitation method as an aqueous dispersion. The following two-steps of reduction methods, namely, seed deposition and seed growth, enabled higher silver coverage on the surface of PDA nanocrystals. Silver fine seeds were successfully deposited on the PDA surface by particularly employing an anionic surfactant as a binder. The extinction spectra of the PDA nanocrystals covered with silver exhibited the red-shift and broadening of surface plasmonic peak for silver nanoparticles, which would indicate the interaction among silver nanoparticles on the same PDA nanocrystal. In addition, the red-shift of excitonic peak for PDA nanocrystals was observed, resulting from the changes of dielectric properties around PDA nanocrystal. Both spectral changes would have an influence on nonlinear optical properties of PDA nanocrystal.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 846: Symposium DD – Organic and Nanocomposite Optical Materials , 2004 , DD10.7
Copyright
Copyright © Materials Research Society 2005

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