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An indium tin oxide (ITO) electrode modified with monolayer clay/[Ru(phen)2(dC18bpy)]2+ (phen= 1,10-phenanthroline, dC18bpy = 4,4′-dioctadecyl-2,2′ bipyridyl) hybrid film has been fabricated by the Langmuir-Blodgett (LB) method. Atomic force microscopy revealed that the single-layered hybrid film of clay/[Ru(phen)2(dC18bpy)]2+ (denoted as Clay-Ru) was closely packed at a surface pressure of 25 mN-m-1 and had a thickness of 3.4±0.5 nm. Cyclic voltammograms showed that the redox current of Ru(Ⅱ) complex decreased when incorporated into the clay film, suggesting that the clay layer acts as a barrier against electron transfer. When applied to oxidizing the mononucleotide of guanosine 5′-monophosphate (GMP), a large catalytic oxidative current was achieved on the Clay-Ru(Ⅱ) modified ITO electrode at the external potential above 900 mV (vs. Ag|AgCl|KCl ) and, more significantly, this response was further enhanced by light irradiation (λ>360 nm), in which the photocurrent is increased about 11 times in comparison with that of a bare ITO. Mechanism of the photoelectrocatalytic effect was proposed in terms of the reduction of the photoelectrochemically generated Ru(Ⅲ) complex in the Clay-Ru film by GMP.
An indium tin oxide (ITO) electrode modified with monolayer clay / [Ru (phen) 2 (dC18bpy)] 2+ (phen = 1,10- phenanthroline, dC18bpy = 4,4’-dioctadecyl-2,2 ’bipyridyl) hybrid film has been fabricated by the Langmuir-Blodgett (LB) method. Atomic force microscopy revealed that the single-layered hybrid film of clay / [Ru (phen) 2 (dC18bpy)] 2+ at a surface pressure of 25 mN-m-1 and had a thickness of 3.4 ± 0.5 nm. Cyclic voltammograms showed that the redox current of Ru (II) complex decreased when incorporated into the clay film, suggesting that the clay layer acts as a When applied to oxidizing the mononucleotide of guanosine 5’-monophosphate (GMP), a large catalytic oxidative current was achieved on the Clay-Ru (II) modified ITO electrode at the external potential above 900 mV (vs. Ag | AgCl | KCl) and, more significantly, this response was further enhanced by light irradiation (λ> 360 nm), where the photocurrent is incre ased about 11 times in comparison with that of a bare ITO. Mechanism of the photoelectrocatalytic effect was proposed in terms of the reduction of the photoelectrochemically generated Ru (III) complex in the Clay-Ru film by GMP.