Electroswitchable photoelectrochemistry by Cu2+ -: polyacrylic acid/CdS-nanoparticle assemblies

被引：24

作者：

Sheeney-Haj-Ichia, L ^{[1
]}

Cheglakov, Z ^{[1
]}

Willner, I ^{[1
]}

机构：

[1] Hebrew Univ Jerusalem, Farkas Ctr Light Induced Proc, Inst Chem, IL-91904 Jerusalem, Israel

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 01期

关键词：

D O I：

10.1021/jp0364295

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

CdS nanoparticles are incorporated into a poly(acrylic acid) (PAA) film associated with an An electrode, and the nanoparticles are covalently linked to the matrix. Cu2+ ions are incorporated into the CdS-nanoparticle-PAA film, and the electroswitchable photocurrent generation by the system, in the presence of triethanolamine as sacrificial electron donor, is demonstrated. The electrochemical reduction of the CdS-Cu2+-PAA state to the CdS-Cu-0-PAA state (-0.55 V vs SCE) leads to the formation of conductive metal nanoclusters that facilitate electron transfer of the CdS-conduction-band electrons to the electrode, and the generation of the photocurrent. The oxidation of the Cu-0 clusters to Cu2+ ions linked to the carboxylate units of PAA (applied potential +0.55 V vs SCE) switches off the photocurrent. The system not only is active for the reversible electroswitchable photocurrent generation but also acts as a photoelectrochemical detector of Cu2+ ions.

引用

页码：11 / 15

页数：5

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