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Performance of Impedimetric Biosensors Based on Anodically Formed Ti/TiO 2 Electrodes
Author(s) -
Mantzila Aikaterini G.,
Prodromidis Mamas I.
Publication year - 2005
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.200503306
Subject(s) - anatase , anodizing , materials science , dielectric spectroscopy , electrode , titanium , amorphous solid , titanium dioxide , electrochemistry , biosensor , analytical chemistry (journal) , chemical engineering , nanotechnology , composite material , chemistry , metallurgy , photocatalysis , chromatography , crystallography , aluminium , biochemistry , engineering , catalysis
The advantages and limitations of impedimetric sensors based on Ti/TiO 2 architectures are described. Titanium dioxide (titania) was potentiostatically formed onto titanium electrodes of 2 mm diameter, at 10 and 30 V in 1 M H 2 SO 4 . The thickness of the titania layers was ellipsometrically determined to be 30 and 86 nm respectively and they are highly insulating with charge‐transfer resistances in the MΩ range, as they were measured with electrochemical impedance spectroscopy under specific experimental conditions. Low voltage anodization (<10 V) results to amorphous TiO 2 , whereas at higher applied voltages (>25 V), anatase is the predominant form. SEM images are indicative of quite smooth, compact coatings without any severe cracks.