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Electrocatalytic oxidation of GMP on an ITO electrode modified by the photodeposition of Pd nanoparticles onto a monolayer TiO_2 nanosheets/[Ru(phen)_2(dC18bpy)]^(2+) hybrid film

查看全文 作　　者：CHEN Xi' An WANG Shun LIN JuanJuan LIU AiLi HUANG [1]ShaoMing 高影响力作者 机构地区：[1]Nano-materials & Chemistry Key Laboratory, Wenzhou University, Wenzhou 325035, China高影响力机构 出　　处：《Science China Chemistry》索引2011年第54卷第3期,共7页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China(21073133,20843007,20471043);Zhejiang Provincial Natural Science Foundation of China(Y5100283,Y4090248,Y4080177);Wenzhou University Foundation(2007L019) 摘　　要：An indium tin oxide(ITO)electrode coated with monolayer TiO2/[Ru(phen)2(dC18bpy)] 2+ (phen=1,10-phenanthroline, dC18bpy=4,4′-dioctadecyl-2,2′-bipyridyl)hybrid film(denoted as ITO/TiO2-Ru)has been prepared using the modified Langmuir-Blodgett(LB)method,and the electrocatalytic oxidation of mononucleotide of guanosine 5′-monophosphate(GMP)on an ITO/TiO2-Ru electrode after Pd-photodeposition(denoted as ITO/TiO2-Ru/Pd)has been studied.Atomic force microscopy reveals that the single-layered hybrid film of TiO2 nanosheets/[Ru(phen)2(dC18bpy)] 2+is closely packed at a surface pressure of 25 mN m 1and has a thickness of(3.20±0.5)nm.X-ray photoelectron spectra show the formation of Pd nanoparticles on the surface of hybrid film with radii of 20–200 nm by the reduction of[Pd(NH3)4] 2+ under light irradiation.When it is applied to oxidize GMP,a larger catalytic oxidative current is achieved on the ITO/TiO2-Ru/Pd electrode at the external potential above 700 mV(vs.Ag|AgCl|KCl)in comparison with the naked ITO electrode and ITO/TiO2-Ru electrode.Such a result indicates that the Pd nanoparticles are able to hamper the combination of electron hole pairs and reduce the counterwork of insulating long alkyl chains of amphiphilic Ru(II)complexes,and thus develops the electron transfer efficiency and produces the enhanced redox current. 关 键 词：二氧化钛涂层 钯纳米粒子 ITO电极 GMP 混合膜 光沉积 单层 氧化修饰
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