Polyoxometalate-Graphene Nanocomposite Modified Electrode for Electrocatalytic Detection of Ascorbic Acid

被引：35
|
作者：
Zhang, Weiying [1 ]
Du, Dan [1 ]
Gunaratne, Don [1 ]
Colby, Robert [2 ]
Lin, Yuehe [1 ]
Laskin, Julia [1 ]
机构：
[1] Pacific NW Natl Lab, Div Phys Sci, Richland, WA 99352 USA
[2] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA
来源：
ELECTROANALYSIS | 2014年 / 26卷 / 01期
基金：
美国能源部;
关键词：
Ascorbic acid; Polyoxometalate; Graphene; Nanocomposites; CARBON NANOTUBES; ENZYME; BIOSENSORS; SENSORS;
D O I：
10.1002/elan.201300343
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Phosphomolybdate functionalized graphene nanocomposite (PMo12-GS) has been successfully formed on a glassy carbon electrode (GCE) for the detection of ascorbic acid (AA). The obtained PMo12-GS modified GCE, was characterized by cyclic voltammetry, electrochemical impedance spectroscopy, scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy and compared with GCE, GS modified GCE, and PMo12 modified GCE. It shows an increased current and a decrease in over-potential of similar to 210 mV. The amperometric signals are linearly proportional to the AA concentration in a wide concentration range from 1 x 10(-6) M to 8 x 10(-3) M, with a detection limit of 0.5 x 10(-6) M. The PMo12-GS modified electrode was employed for the determination of the AA level in vitamin C tablets, with recoveries between 96.3 and 100.8%.
引用
收藏
页码：178 / 183
页数：6
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