Fabrication of anodic photocurrent generation systems by use of 6-O-dihydrophytylcellulose as a matrix or a scaffold of porphyrins |
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Authors: | Keita Sakakibara Fumiaki Nakatsubo |
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Institution: | (1) Division of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku Kyoto, 606-8502, Japan |
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Abstract: | Langmuir-Blodgett (LB) films containing porphyrin molecules were fabricated by use of 6-O-dihydrophytylcellulose (DHPC) toward anodic photocurrent generation systems. To suppress the porphyrin aggregation, two different
approaches were applied: (1) mixing a low-molecular-weight porphyrin having a diterpenoid carbon skeleton (DPor) with DHPC
as a matrix (matrix fabrication) and (2) bonding porphyrin molecules to the hydroxyl groups of DHPC covalently, converting
into 6-O-dihydrophytyl-2,3-di-O-p-(10,15,20-triphenyl-5-porphyrinyl)-benzoyl]cellulose as a scaffold (scaffold fabrication). The structure and film properties
of the monolayers and the LB films were investigated by the surface pressure (π)–area (A) isotherm measurements, atomic force microscopy, UV–Vis spectroscopy, and absorption dichroism measurements. The porphyrin
aggregation in the LB film could be well suppressed only by the scaffold fabrication, leading to the improvement of the photocurrent
quantum yields. The efficient photocurrent performance can be demonstrated by the isolation and the parallel orientation of
porphyrin moieties due to the cellulose rigid scaffold.
This paper was the subject of the Best Poster Award of the 235th edition of the ACS National Meeting, Cellulose and Renewable
Materials. |
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Keywords: | Langmuir-Blodgett film Porphyrin Photocurrent generation system Regioselectively substituted cellulose derivative |
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