Carbon nanotubes grown on stainless steel to form plate and probe electrodes for chemical/biological sensing.
This paper describes the fabrication and evaluation of carbon nanotube (CNT) electrodes grown on stainless steel (SS) plate and wire for electrochemical sensor applications. Multi-wall carbon nanotubes with different diameters were grown on the SS plate and wire by chemical vapor deposition from an ethylene precursor. The SS provides a good electrical and mechanical connection to the CNT, and the SS is a tough substrate. The SS part of the electrode was electrically insulated from the analyte so that only the CNT were active in sensing. Cyclic voltammetry for the reduction of 6 mM K3Fe(CN)6 in a 1.0 M KNO3 supporting electrolyte was performed to examine the redox behavior of the CNT-SS electrode. The cyclic voltammograms showed sigmoidal-like shapes, indicating that mass transport around the electrodes is dominated by radial diffusion. Based on the cyclic voltammograms, the effective area of the CNT-SS electrodes and the number of individual CNTs were estimated. These results indicate that the CNT-SS plate and wire electrodes are good candidates to develop practical in vivo biosensors.
Yun
Yeoheung
Y
Department of Mechanical, Industrial and Nuclear Engineering, Smart Materials Nanotechnology Laboratory, University of Cincinnati, Cincinnati, OH 45221-0172, USA.
Gollapudi
Ram
R
Shanov
Vesselin
V
Schulz
Mark J
MJ
Dong
Zhongyun
Z
Jazieh
Abdul
A
Heineman
William R
WR
Halsall
H Brian
HB
Wong
Danny K Y
DK
Bange
Adam
A
Tu
Yi
Y
Subramaniam
Srinivas
S
D015374:Biosensing Techniques; D004563:Electrochemistry; D008839:Microelectrodes; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology; D037742:Nanotubes, Carbon / Q000648:ultrastructure*; D053770:Nanowires / Q000648:ultrastructure; D013193:Stainless Steel
D037742:Nanotubes, Carbon; D013193:Stainless Steel