The Influence of Nanopore Dimensions on the Electrochemical Properties of Nanopore Arrays Studied by Impedance Spectroscopy

Krishna Kant, Craig Priest, Joseph Shapter, Dusan Losic

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    The understanding of the electrochemical properties of nanopores is the key factor for better understanding their performance and applications for nanopore-based sensing devices. In this study, the influence of pore dimensions of nanoporous alumina (NPA) membranes prepared by an anodization process and their electrochemical properties as a sensing platform using impedance spectroscopy was explored. NPA with four different pore diameters (25 nm, 45 nm and 65 nm) and lengths (5 μm to 20 μm) was used and their electrochemical properties were explored using different concentration of electrolyte solution (NaCl) ranging from 1 to 100 μM. Our results show that the impedance and resistance of nanopores are influenced by the concentration and ion species of electrolytes, while the capacitance is independent of them. It was found that nanopore diameters also have a significant influence on impedance due to changes in the thickness of the double layer inside the pores.

    Original languageEnglish
    Pages (from-to)21316-21328
    Number of pages13
    JournalSensors
    Volume14
    Issue number11
    DOIs
    Publication statusPublished - 10 Nov 2014

    Keywords

    • Anodization
    • Electrochemical impedance spectroscopy (EIS)
    • Nanopore arrays
    • Porous alumina

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