Enhanced Electroanalytical Sensitivity via Interface Miniaturisation: Ion Transfer Voltammetry at an Array of Nanometre Liquid–Liquid Interfaces

Authors

  • Micheál D. Scanlon,

    1. Tyndall National Institute, University College Cork, Cork, Ireland
    2. Present address: Materials and Surface Science Institute, University of Limerick, Ireland
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  • Damien W. M. Arrigan

    Corresponding author
    1. Tyndall National Institute, University College Cork, Cork, Ireland
    2. Present address: Nanochemistry Research Institute, Department of Chemistry, Curtin University, GPO Box U1987, Perth, WA 6845, Australia fax: +61-8-9266-4699
    • Tyndall National Institute, University College Cork, Cork, Ireland
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Abstract

The benefit of miniaturization towards the nanoscale of electroanalytical systems was evaluated by assessment of the sensitivity of the response. Ion transfer voltammetry across the interface between two immiscible electrolyte solutions (ITIES) was employed as the basis for detection of nonredoxactive ions. The analytical sensitivity increased on miniaturisation of the interface from millimetre-, to micrometre-, to nanometre-scale, with an improvement in sensitivity of more than three orders of magnitude. This is due to the enhanced mass transport via convergent diffusion as the size of the ITIES is minimised. These results illustrate the benefit of miniaturisation of electrochemical detection methods to the nanoscale.

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