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Experimental evaluation of diffusion constant in a thin polymer film by triplet lifetime analysis of single molecules

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Title: Experimental evaluation of diffusion constant in a thin polymer film by triplet lifetime analysis of single molecules
Authors: Chiba, Takashi Browse this author
Fujiwara, Hideki Browse this author →KAKEN DB
Hotta, Jun-ichi Browse this author
Takeuchi, Shigeki Browse this author →KAKEN DB
Sasaki, Keiji Browse this author →KAKEN DB
Keywords: Triplet lifetime analysis
Single-molecule spectroscopy
Photon interdetection time analysis method
Oxygen diffusion constant
Thin polymer film
Issue Date: 15-Jun-2012
Publisher: Elsevier B.V.
Journal Title: Journal of Photochemistry and Photobiology A: Chemistry
Volume: 238
Start Page: 24
End Page: 28
Publisher DOI: 10.1016/j.jphotochem.2012.04.013
Abstract: We propose a method for dynamically sensing oxygen concentration in a local nanoscale domain of a thin polymer film using histograms of photon interdetection times of single molecules. By temporally analyzing the histograms, a dynamical change in the triplet lifetime of single molecules in thin polymer films with different thicknesses can be measured with respect to the oxygen concentration in a gas cell. From the time lags for observing the triplet lifetime change in the histograms due to differences in the oxygen diffusion times in the films, we estimate the diffusion constants in a local nanoscale domain of films, which approximately corresponds to the reported values in the bulk film. Thus, we conclude that this method is applicable to in situ nanoscale environmental sensors with high spatial resolution in heterogeneous materials, such as polymer blends, biological cells, and thin-film devices.
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤原 英樹

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