Document Detail

Investigation of interfacial capacitance of Pt, Ti and TiN coated electrodes by electrochemical impedance spectroscopy.
MedLine Citation:
PMID:  12202164     Owner:  NLM     Status:  MEDLINE    
Electrochemical processes at the electrode-electrolyte (body fluid) interface are of ultimate importance for stimulating/sensing electrode function. A high electrode surface area is desirable for safe stimulation through double-layer charging and discharging. Pt and Pt-Ir alloys have been the most common electrode materials. The use of TiN coating as the surface layer on the electrode has found increasing interest because of its metal-like conductivity, excellent mechanical and chemical properties, and the fact that it can be deposited with a high surface area. In this work, electrochemical impedance spectroscopy (EIS), which is a sensitive and non-destructive technique and widely used for characterization of electrical properties of electrode-electrolyte interfaces, was applied to investigate pure Pt and Ti, and TiN coated electrodes exposed to a phosphate-buffered-saline (PBS) solution. Platinized Pt and Ti were also studied for comparison. The capacitance value of the electrodes in PBS was obtained through quantitative analysis of the EIS spectra. The results reveal that the capacitance of the TiN coated electrodes with a rough surface is several hundreds times higher than that of a smooth Pt surface. Platinization of Ti can also increase the capacitance to the same extent as platina. EIS has been shown to be a powerful technique for characterization of stimulating/sensing electrodes.
A Norlin; J Pan; C Leygraf
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biomolecular engineering     Volume:  19     ISSN:  1389-0344     ISO Abbreviation:  Biomol. Eng.     Publication Date:  2002 Aug 
Date Detail:
Created Date:  2002-08-30     Completed Date:  2003-03-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100928062     Medline TA:  Biomol Eng     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  67-71     Citation Subset:  IM    
Department of Material Science and Engineering, Royal Institute of Technology, Drottning Kristinas Väg 51, SE-100 44 Stockholm, Sweden.
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MeSH Terms
Coated Materials, Biocompatible*
Electric Capacitance
Electric Impedance
Electrochemistry / methods
Materials Testing / methods
Sensitivity and Specificity
Sodium Chloride
Spectrum Analysis / methods*
Surface Properties
Reg. No./Substance:
0/Coated Materials, Biocompatible; 0/Phosphates; 11116-16-8/titanium nitride; 7440-06-4/Platinum; 7440-32-6/Titanium; 7647-14-5/Sodium Chloride

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