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Electrochemical Sensing Properties of Ultra Long Aligned Multi-Walled Carbon Nanotube Microelectrodes

Published online by Cambridge University Press:  01 February 2011

Niramol Punbusayakul
Affiliation:
pniramol@yahoo.com, Rensselaer Polytechnic Institute, Material Science and Engineering, 110 8th St., Troy, NY, 12180, United States, 518-2766541, 518-2766540
Lijie Ci
Affiliation:
cil@rpi.edu, Rensselaer Polytechnic Institute, Material Science and Engineering, 110 8th St., Troy, NY, 12180, United States
Saikat Talapatra
Affiliation:
talaps@rpi.edu, Rensselaer Polytechnic Institute, Material Science and Engineering, 110 8th St., Troy, NY, 12180, United States
Werasak Surareungchai
Affiliation:
werasak@pdti.kmutt.ac.th, King Mongkut¡¯s University of Technology Thonburi, School of Bioresources and Technology, 83 Moo 8, Bangkhuntien-Chaitalay Rd, Thakam, Bangkok, 10150, Thailand
Pulickel M. Ajayan
Affiliation:
ajayan@rpi.edu, Rensselaer Polytechnic Institute, Material Science and Engineering, 110 8th St., Troy, NY, 12180, United States
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Abstract

We report on the electrochemical properties of ultra long aligned multiwalled carbon nanotube (MWNT) bundles synthesized using water-assisted chemical vapor deposition process. Cyclic voltammogram with diffusion-controlled-reversible reaction obtained at MWNT electrodes in 10 mM K3(Fe(CN)6) /0.1 M KCl solution with varying scan rates indicates that radial diffusion mass transport is dominant at these electrodes. We further show that these electrodes can detect very low concentrations of ascorbic acid (AA) and dopamine (DA) (0.7 μM for AA and 1.87 μM for DA ). The excellent electrochemical properties along with nice performance for single species detection suggest that these MWNTs are promising electrode materials for developing high sensitive chemical and/or biological sensors.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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