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

Berchmans, Sheela; Vergheese, T. Mary; Kavitha, A. L.; Veerakumar, Manoj; Yegnaraman, V.
February 2008
Analytical & Bioanalytical Chemistry;Feb2008, Vol. 390 Issue 3, p939
Academic Journal
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. [Figure not available: see fulltext.]


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