Electrocatalysis at a thin multi-wall carbon nanotube film modified glassy carbon electrode

被引：0
|
作者：
Fei, J [1 ]
Sun, Y [1 ]
Hu, S [1 ]
Gao, Z [1 ]
机构：
[1] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China
来源：
NSTI NANOTECH 2004, VOL 3, TECHNICAL PROCEEDINGS | 2004年
关键词：
carbon nanotube; voltammetry; amperometry; electrode; ascorbic acid;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A sensitive and selective amperometric procedure based on a glassy carbon electrode (GCE) modified with a thin multi-wall carbon nanotube (MWNT) film, for the determination of ascorbic acid (AA) was developed. The modified electrode showed excellent electrocatalytic activity towards the oxidation of AA. The oxidation potential of AA shifted negatively by as much as 460 mV to -18 mV (vs. SCE) at the modified electrode. Experimental variables were investigated and optimized. Amperometric tests of AA were performed at -10 mV. A linear response was obtained in the range of 5.0 10(-6) to 4.0 10(-3) M with a detection limit of 2.0 10(-6) M. Interference studies indicated that the modified electrode is highly selective to AA in a mixture of AA, uric acid and dopamine. The proposed procedure was applied to the determination of AA in pharmaceutical and food samples with little or no sample pretreatment.
引用
收藏
页码：260 / 263
页数：4
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