Redox switching of polyoxometalate-methylene blue-based layer-by-layer films

Nargis Anwar; Mikhail Vagin; Rashda Naseer; Shahzad Imar; Masooma Ibrahim; Sib Sankar Mal; Ulrich Kortz; Fathima Laffir; Timothy McCormac

doi:10.1021/la3004068

Redox switching of polyoxometalate-methylene blue-based layer-by-layer films

Nargis Anwar, Mikhail Vagin, Rashda Naseer, Shahzad Imar, Masooma Ibrahim, Sib Sankar Mal, Ulrich Kortz, Fathima Laffir, Timothy McCormac

Research output: Contribution to journal › Article › peer-review

Abstract

Iron-substituted crown-type polyoxometalate (POM) [P ₈W ₄₈O ₁₈₄Fe ₁₆(OH) ₂₈(H ₂O) 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.

Original language	English
Pages (from-to)	5480-5488
Number of pages	9
Journal	Langmuir
Volume	28
Issue number	12
DOIs	https://doi.org/10.1021/la3004068
Publication status	Published - 27 Mar 2012

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title = "Redox switching of polyoxometalate-methylene blue-based layer-by-layer films",

abstract = "Iron-substituted crown-type polyoxometalate (POM) [P 8W 48O 184Fe 16(OH) 28(H 2O) 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.",

author = "Nargis Anwar and Mikhail Vagin and Rashda Naseer and Shahzad Imar and Masooma Ibrahim and Mal, {Sib Sankar} and Ulrich Kortz and Fathima Laffir and Timothy McCormac",

year = "2012",

month = mar,

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doi = "10.1021/la3004068",

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T1 - Redox switching of polyoxometalate-methylene blue-based layer-by-layer films

AU - Anwar, Nargis

AU - Vagin, Mikhail

AU - Naseer, Rashda

AU - Imar, Shahzad

AU - Ibrahim, Masooma

AU - Mal, Sib Sankar

AU - Kortz, Ulrich

AU - Laffir, Fathima

AU - McCormac, Timothy

PY - 2012/3/27

Y1 - 2012/3/27

N2 - Iron-substituted crown-type polyoxometalate (POM) [P 8W 48O 184Fe 16(OH) 28(H 2O) 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.

AB - Iron-substituted crown-type polyoxometalate (POM) [P 8W 48O 184Fe 16(OH) 28(H 2O) 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.

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Redox switching of polyoxometalate-methylene blue-based layer-by-layer films

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