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Photoelectrocatalytic oxidation of GMP on an ITO electrode modified with clay/[Ru(phen)_2(dC18bpy)]^(2+) hybrid film

查看全文 作　　者：CHANG XueQin, WANG Shun, LIN DaJie, GUAN WeiPeng, ZHOU Huan & HUANG ShaoMing Nano-materials and Chemistry Key Laboratory, Wenzhou University, Wenzhou 325027, China 高影响力作者 出　　处：《Science China Chemistry》索引2009年第52卷第3期,共7页高影响力期刊 基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 20471043 and 20843007);Zhejiang Provincial Natural Science Foundation (Grant Nos. Y404118 and Y408177);the '151' Distinguished Person Foundation of Zhejiang Province of China;Zhejiang Technology Project Foundation (Grant No. 2007C21134);Wenzhou Technology Project Foundation (Grant No. N2004B040) 摘　　要：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. 关 键 词：clay-modified ELECTRODES LANGMUIR-BLODGETT method hybrid film PHOTOCURRENT
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