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Electrochemical preparation of copper-dendrimer nanocomposites: picomolar detection of Cu2+ ions
- Source :
- Analytical and bioanalytical chemistry. 390(3)
- Publication Year :
- 2007
-
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 Cu(2+) 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.
Details
- ISSN :
- 16182650
- Volume :
- 390
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Analytical and bioanalytical chemistry
- Accession number :
- edsair.doi.dedup.....88b02c22b8bdf8f127c87edebad3dee5