Size-dependent optical properties of polydiacetylene nanocrystal

Victor V. Volkov, Tsuyoshi Asahi*, Hiroshi Masuhara, Akito Masuhara, Hitoshi Kasai, Hidetoshi Oikawa, Hachiro Nakanishi

*Corresponding author for this work

Research output: Contribution to journalArticle

71 Scopus citations

Abstract

We have investigated size-dependent optical properties of poly-1,6-di(N-carbazolyl)-2,4-hexadiyne (poly-DCHD) nanocrystals in ensemble and in a single particle level. Our experimental results demonstrate that far-field microscopy coupled with an AFM setup is a reliable experimental approach for investigating optical properties of single organic nanoparticles. Single poly-DCHD nanocrystals show resonant Rayleigh scattering spectra with a lower resonance energy peak for nanocrystals having larger cross-section against its long axis. We also examined the extinction and the resonant Rayleigh scattering spectra in ensemble and the resonant Rayleigh and Raman scattering spectra and their anisotropy of single nanocrystals. The results indicate that the size-dependent resonance peak of the polymer-backbone electronic transition can be ascribed to structural confinement of nanocrystals, which reduces the effective conjugation length of π-electron in the polymer backbone for nanocrystals with a small cross-section.

Original languageEnglish
Pages (from-to)7674-7680
Number of pages7
JournalJournal of Physical Chemistry B
Volume108
Issue number23
DOIs
StatePublished - 10 Jun 2004

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