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Sensors 2014, 14(11), 21316-21328; doi:10.3390/s141121316

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

1
School of Chemical and Physical Sciences, Flinders University, Bedford Park, Adelaide, SA 5042, Australia
2
School of Chemical Engineering, the University of Adelaide, Adelaide, SA 5005, Australia
3
Ian Wark Research Institute, University of South Australia, Mawson Lakes, Adelaide, SA 5095, Australia
*
Author to whom correspondence should be addressed.
Received: 22 July 2014 / Revised: 24 October 2014 / Accepted: 5 November 2014 / Published: 11 November 2014
(This article belongs to the Special Issue Nanopore Sensors: Fabrications, Properties and Applications)
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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. View Full-Text
Keywords: anodization; porous alumina; Electrochemical Impedance Spectroscopy (EIS); nanopore arrays anodization; porous alumina; Electrochemical Impedance Spectroscopy (EIS); nanopore arrays
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kant, K.; Priest, C.; Shapter, J.G.; Losic, D. The Influence of Nanopore Dimensions on the Electrochemical Properties of Nanopore Arrays Studied by Impedance Spectroscopy. Sensors 2014, 14, 21316-21328.

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