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Electrochemical preparation of copper–dendrimer nanocomposites: picomolar detection of Cu2+ ions

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Abstract

The present work describes, for the first time, in situ electrochemical preparation of dendrimer-encapsulated Cu nanoparticles using a self-assembled monolayer of fourth-generation amine-terminated polyamidoamine (PAMAM) dendrimer as the template. Atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) studies of the modified surface confirmed the presence of Cu nanoparticles entrapped in dendrimer film. Au electrode modified with a monolayer of the dendrimer enables preconcentration and subsequent voltammetric detection of Cu2+ at picomolar concentrations. Further, Cu nanoparticles in the dendrimer monolayer could be electrochemically derivatised to Cu hexacyanoferrate, which exhibits specific crystal planes, unlike the random distribution of crystal planes in bulk-formed Cu hexacyanoferrate, which is another catalytically active material for sensor applications.

Electrochemical preparation of copper–dendrimer nanocomposite

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Acknowledgement

The authors wish to thank the funding agencies Defence Research and Development Organisation, New Delhi (DRDO) and Department of Science and Technology, New Delhi (DST) for funding this project. We also acknowledge the Veeco-India Nanotechnology laboratory at JNCASR, Bangalore for the atomic force microscopic images.

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Authors and Affiliations

  1. Central Electrochemical Research Institute, Karaikusi, 630006, Taminadu, India

    Sheela Berchmans, T. Mary Vergheese, A. L. Kavitha, Manoj Veerakumar & V. Yegnaraman

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  1. Sheela Berchmans
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  2. T. Mary Vergheese
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  3. A. L. Kavitha
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  4. Manoj Veerakumar
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  5. V. Yegnaraman
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Correspondence to Sheela Berchmans.

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Berchmans, S., Vergheese, T.M., Kavitha, A.L. et al. Electrochemical preparation of copper–dendrimer nanocomposites: picomolar detection of Cu2+ ions. Anal Bioanal Chem 390, 939–946 (2008). https://doi.org/10.1007/s00216-007-1723-z

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  • DOI: https://doi.org/10.1007/s00216-007-1723-z

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