Journal
TALANTA
Volume 88, Issue -, Pages 445-449Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2011.10.056
Keywords
Carbon nanoparticles; Cyclic voltammetry; Modified electrodes; Electrocatalysis
Categories
Funding
- National Science Council in Taiwan [NSC 95-2113-M-007-040-MY3, 98J900026]
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A simple procedure for the modification of carbon nanoparticles (CNPs) from castor oil soot using acid treatment was described herein. Characterization studies revealed the presence of edge plane sites and surface carbon-oxygen functionalities at the surface of the CNP material. Voltammetric studies revealed the increased electrochemical activity of the CNP-modified electrode toward various biologically important molecules, including dopamine, uric acid, dihydronicotinamide adenine dinucleotide, tyrosine, and serotonin, relative to those obtained using the unmodified electrode. The improved electro-oxidation potentials for these compounds-and, thereby, the enhanced sensitivity of related sensors was due directly to the presence of surface C(delta+)=O(delta-) functional groups and the greater number of edge plane sites developed after acid treatment of the soot sample. (C) 2011 Elsevier B.V. All rights reserved.
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