Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 11, Issue 7, Pages 1365-1368Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2009.05.004
Keywords
Nanoporous gold (NPG); p-Nitrophenol (p-NP); Sensor; Cyclic voltammetry (CV); Selectivity
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Funding
- National Natural Science Foundation of China [20673067]
- National Basic Research Program of China [2007CB936602, 2009CB930103]
- SEM-NCET
- SRF-RCICS Programs
- Shandong Natural Science Fund for Distinguished Young Scholars
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Nanoporous gold (NPG) with uniform pore sizes and ligaments was prepared by a simple dealloying method. The as-prepared NPG samples were used as the working electrodes to investigate the redox behavior of p-nitrophenol (p-NP) by cyclic voltammetry (CV). Quite different from the voltammetric behavior of polycrystalline gold electrode, the CV profiles of NPG display a pair of nearly symmetric redox waves which are ascribed to the reaction of 4-(hydroxyamino)phenol/4-nitrosophenol couple. It is interesting that this pair of redox waves are hardly affected by the isomers of p-NP; and moreover, their peak areas are linear with the concentration of p-NP in the range from 0.25 to 10 mg dm(-3). Because of high sensitivity and good selectivity, NPG is expected to act as a promising electrochemical sensor material for detecting trace p-NP in wastewaters. (c) 2009 Elsevier B.V. All rights reserved.
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