Hyomen Kagaku
Online ISSN : 1881-4743
Print ISSN : 0388-5321
ISSN-L : 0388-5321
Preparation and Photoelectrochemical Properties of Fullerene Modified ITO Electrodes Using Self-Assembled Monolayer
Shinichiro OZAWA
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2004 Volume 25 Issue 7 Pages 428-433


Fullerene (C60) immobilized indium-tin-oxide (ITO) electrodes were prepared by a technique of self-assembled monolayers (SAMs) using five compounds of alkyldiamine (NH2(CH2)nNH2; n = 4, 6, 8, 10 and 12). These C60/diamine-SAMs modified ITO (C60/n/ITO; n = 4, 6, 8, 10 and 12) electrodes were examined in terms of properties of electrochemical and photoelectrochemical responses. The C60 surface coverage of C60/n/ITOs estimated was ca. 3×10−10 to 4×10−10 mol cm−2. The stable anodic photocurrent appeared immediately after the irradiation of the C60/n/ITO electrode in 0.1 M Na2SO4 containing 50 mM ascorbic acid (AA) as an electron sacrificer with λ = 400−600 nm, light power of 4.0−6.5 mW cm−2 and electrode potential of −0.15 V to +0.15 V vs. Ag/AgCl (saturated KCl). The photocurrents generated by C60/n/ITOs increased with the number of the methylene unit (n) except for n = 12. These results have shown that increasing the length of the methylene contributes to only immobilization of C60, because of highly ordered structure of diamine-SAMs.

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