Fullerene (C
60) immobilized indium-tin-oxide (ITO) electrodes were prepared by a technique of self-assembled monolayers (SAMs) using five compounds of alkyldiamine (NH
2(CH
2)nNH
2; n = 4, 6, 8, 10 and 12). These C
60/diamine-SAMs modified ITO (C
60/n/ITO; n = 4, 6, 8, 10 and 12) electrodes were examined in terms of properties of electrochemical and photoelectrochemical responses. The C
60 surface coverage of C
60/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 C
60/n/ITO electrode in 0.1 M Na
2SO
4 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 C
60/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 C
60, because of highly ordered structure of diamine-SAMs.
抄録全体を表示