Structure and photoelectrochemical properties of porphyrin-linked fullerenes on a gold surface using a self-assembled monolayer technique

Hiroshi Imahori; Takayuki Azuma; Kiminori Ushida; Masao Takahashi; Tsuyoshi Akiyama; Masato Hasegawa; Tadashi Okada; Yoshiteru Sakata

doi:10.1117/12.279246

1 November 1997 Structure and photoelectrochemical properties of porphyrin-linked fullerenes on a gold surface using a self-assembled monolayer technique

Hiroshi Imahori, Takayuki Azuma, Kiminori Ushida, Masao Takahashi, Tsuyoshi Akiyama, Masato Hasegawa, Tadashi Okada, Yoshiteru Sakata

Author Affiliations +

Proceedings Volume 3142, Fullerenes and Photonics IV; (1997) https://doi.org/10.1117/12.279246
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Self-assembled monolayers (SAMs) have recently attracted much attention as a new methodology among a variety of thin film preparation. There have been several reports of fullerene SAM. These fullerene thin films seem to be the most promising candidates for realizing photovoltaic and optoelectronic devices at the nano-scale level. We have applied this technique to donor-linked fullerene systems and have developed supramolecular porphyrin-C₆₀ molecules that are designed to be self-assembled on gold surface. Such systems are expected to mimic supramolecular photoinduced charge-separation events in photosynthesis. Porphyrin-linked C₆₀ bearing a methylthio group was prepared by 1,3- dipolar cycloaddition of the azomethine ylide porphyrin with C₆₀. SAM was formed by soaking Au electrode into a CH₂Cl₂ solution of the porphyrin-C₆₀ dyad. Structure of the SAM was investigated by spectroscopic methods including X-ray photoelectron spectroscopy and ellipsometry and electrochemical studies. The large photocurrent with a level of sub-(mu) A/cm² was observed for the photochemical cell in the presence of methyl viologen under illumination with approximately 10 mW/cm². Possible mechanism for the photocurrent generation is discussed in terms of the photodynamics of porphyrin-linked fullerenes.

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Hiroshi Imahori, Takayuki Azuma, Kiminori Ushida, Masao Takahashi, Tsuyoshi Akiyama, Masato Hasegawa, Tadashi Okada, and Yoshiteru Sakata "Structure and photoelectrochemical properties of porphyrin-linked fullerenes on a gold surface using a self-assembled monolayer technique", Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997); https://doi.org/10.1117/12.279246

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