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Three‐Dimensional Interdigitated Electrode Array as a Tool for Surface Reactions Registration
Author(s) -
Bratov Andrey,
Abramova Natalia,
Marco M. Pilar,
SanchezBaeza Francisco
Publication year - 2012
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.201100392
Subject(s) - electrode , analyte , surface modification , materials science , transducer , planar , electrode array , surface conductivity , molecule , optoelectronics , covalent bond , chemical modification , nanotechnology , chemistry , conductivity , computer science , acoustics , organic chemistry , polymer chemistry , chromatography , physics , computer graphics (images)
Possible applications of a new transducer based on a three dimensional interdigitated electrode array (3D‐IDEA) with electrode digits separated by an insulating barrier are discussed. Due to the presence of insulating barriers that separate the adjacent digits of the electrodes the main portion of the probing electrical current goes close to the surface of the barrier. Chemical modification of the barrier surface with the probe molecules permits to realise direct detection of subsequent target analytes in solution. The functional mechanism of the device is based on registration of changes in conductivity at the surface of the barrier provoked by electrical charge redistribution caused by surface chemical reactions. Three‐dimensional sensor shows considerable improvement in sensitivity compared with a standard planar IDEA design sensors. The potential of the developed device as a sensor transducer to detect various chemical and bio chemical reactions is demonstrated. Examples include enzyme immobilisation, polyelectrolytes layer‐by‐layer deposition, covalent chemical modification with molecules containing reactive thiol groups.