Redox Switching of Polyoxometalate-Methylene Blue-Based Layer-by-Layer Films

被引：28

作者：

Anwar, Nargis ^{[1
]}

Vagin, Mikhail ^{[1
]}

Naseer, Rashda ^{[1
]}

Imar, Shahzad ^{[1
]}

Ibrahim, Masooma ^{[2
]}

Mal, Sib Sankar ^{[2
]}

Kortz, Ulrich ^{[2
]}

Laffir, Fathima ^{[3
]}

McCormac, Timothy ^{[1
]}

机构：

[1] Dundalk Inst Technol, Electrochem Res Grp, Dept Appl Sci, Dundalk, County Louth, Ireland

[2] Jacobs Univ, Sch Sci & Engn, D-28725 Bremen, Germany

[3] Univ Limerick, Mat & Surface Sci Inst, Limerick, Ireland

来源：

LANGMUIR | 2012年 / 28卷 / 12期

关键词：

ULTRATHIN MULTILAYER FILMS; SELF-ASSEMBLED FILMS; ELECTROCHEMICAL-BEHAVIOR; ELECTROCATALYTIC PROPERTIES; TRANSITION-METAL; COMPOSITE FILMS; POLYPYRROLE; ELECTRODE; SURFACE; HETEROPOLYANIONS;

D O I：

10.1021/la3004068

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Iron-substituted crown-type polyoxometalate (POM) [P8W48O184Fe16(OH)(28)(H2O)(4)](20-) has been successfully immobilized onto glassy carbon electrode surfaces by means of the layer-by-layer (LBL) technique employing the cationic redox active dye, methylene blue (MB). The constructed multilayers exhibit pH-dependent redox activity for both the anionic POM and the cationic dye moieties, which is in good agreement with their solution behavior. The films have been characterized by alternating current impedance, atomic force microscopy, and X-ray photoelectron spectroscopy, whereby the nature of the outer layer within the assemblies was found to have an effect upon the film's behavior. Preliminary investigations show that the POM dye-based films show electrocatalytic ability toward the reduction of hydrogen peroxide, however, only when there is an outer anionic POM layer.

引用

页码：5480 / 5488

页数：9

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