The influence of nanopore dimensions on the electrochemical properties of nanopore arrays studied by impedance spectroscopy.
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.
School of Chemical and Physical Sciences, Flinders University, Bedford Park, Adelaide, SA 5042, Australia. Krishna.Kant@adelaide.edu.au.
Krishna
K
Kant
Ian Wark Research Institute, University of South Australia, Mawson Lakes, Adelaide, SA 5095, Australia. Craig.priest@unisa.edu.au.
Craig
C
Priest
School of Chemical and Physical Sciences, Flinders University, Bedford Park, Adelaide, SA 5042, Australia. joe.shapter@flinders.edu.au.
Joe G
JG
Shapter
School of Chemical Engineering, the University of Adelaide, Adelaide, SA 5005, Australia. Dusan.losic@adelaide.edu.au.
Dusan
D
Losic
D000537:Aluminum Oxide / Q000737:chemistry*; D003217:Conductometry / Q000295:instrumentation*; D058266:Dielectric Spectroscopy / Q000295:instrumentation*; D004553:Electric Conductivity; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D046228:Microarray Analysis / Q000295:instrumentation*; D058608:Nanopores / Q000648:ultrastructure*; D010316:Particle Size; D016062:Porosity; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers
D000537:Aluminum Oxide