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Enhanced Electroanalytical Sensitivity via Interface Miniaturisation: Ion Transfer Voltammetry at an Array of Nanometre Liquid–Liquid Interfaces
Author(s) -
Scanlon Micheál D.,
Arrigan Damien W. M.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201000667
Subject(s) - ities , nanometre , miniaturization , sensitivity (control systems) , voltammetry , materials science , nanoscopic scale , nanotechnology , electrolyte , ion , cyclic voltammetry , ultramicroelectrode , electrochemistry , analytical chemistry (journal) , electrode , chemistry , chromatography , electronic engineering , organic chemistry , engineering , composite material
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.