期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 143, 期 2, 页码 696-703出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2009.10.026
关键词
Multiwalled carbon nanotube; Gold nanoparticles; Silica network; Ascorbic acid; Electrochemical sensor
资金
- Kyungpook National University Research Fund
- National Research Foundation of Korea [2008-2005994]
- National Research Foundation of Korea [과06B1508, 2008-2005994] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Multiwalled carbon nanotubes (MWNTs) was grafted onto silica network (MWNT-silica-NW) by sol-gel process. MWNT-silica-NW was further electrodeposited with gold nanoparticles (AuNPs). The morphology of the GC/MWNT-silica-NW-AuNPs modified electrode (ME) was analyzed by Held emission scanning electron microscopy (FE-SEM). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to evaluate the electrochemical performances of GC/MWNT-silica-NW-AuNPs-ME. Ascorbic acid (AA) was found to be electrocatalytically oxidized at GC/MWNT-silica-NW-AuNPs-ME due to the synergistic influence of MWNTs, silica-NW and AuNPs. The MWNT-silica-NW-AuNPs-ME sensor electrode presents a high sensitivity (8.59 mu A/mM) and selectivity for AA in the presence of dopamine (DA). Differential Pulse voltammetry revealed that the sensor electrode exhibited excellent selectivity for AA in the presence of large excess of DA with a large potential separation of similar to 0.26V. The effective electrocatalytic activity, excellent peak resolution and ability for independent determination of DA in the presence of AA reveal that MWNT-silica-NW-AuNPs-ME is suitable for simultaneous and selective determination of DA and AA. (C) 2009 Elsevier B.V. All rights reserved.
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