Emission Enhancement of Water-Soluble Porphyrin Immobilized in DNA Ultrathin Films by Localized Surface Plasmon Resonance of Gold Nanoparticles

Hiroya MORITA  Hideki KAWAI  Kenji TAKEHARA  Naoki MATSUDA  Toshihiko NAGAMURA  

IEICE TRANSACTIONS on Electronics   Vol.E102-C   No.2   pp.100-106
Publication Date: 2019/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.2018OMP0001
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Organic Molecular Electronics and Biotechnology)
fluorescence and phosphorescence enhancement,  DNA ultrathin films,  gold nanoparticles,  localized surface plasmon resonance,  

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Photophysical properties of water-soluble porphyrin were studied in aqueous solutions with/without DNA and in DNA solid films. Ultrathin films were prepared from aqueous DNA solutions by a spin-coating method on glass or on gold nanoparticles (AuNPs). Remarkable enhancement of phosphorescence was observed for porphyrin immobilized in DNA films spin-coated on AuNPs, which was attributed to the electric field enhancement and the increased radiative rate by localized surface plasmon resonance of AuNPs.