期刊
APPLIED SURFACE SCIENCE
卷 357, 期 -, 页码 1251-1259出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.09.177
关键词
Graphene oxide; Lanthanum; Dopamine; Sensor
类别
资金
- Shanghai Leading Academic Discipline Project [J51503]
- National Natural Science Foundation of China [20976105]
- Science and Technology Commission of Shanghai Municipality Innovation Research Program of Shanghai Talent Development Funding [201335]
- Scientific Research Foundation of SIT [YJ2014-32]
A home-made carbon paste electrode (CPE) was reformed by graphene oxide (GO)/lanthanum (La) complexes, and a modified electrode, called GO-La/CPE, was fabricated for the selective determination of dopamine (DA) by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Several factors affecting the electrocatalytic performance of the modified sensor were investigated. Owning to the combination of GO and La ions, the GO-La/CPE sensor exhibited large surface area, well selectivity, good repeatability and stability in the oxidation reaction of DA. At optimal conditions, the response of the GO-La/CPE electrode for determining DA was linear in the region of 0.01-0.1 mu M and 0.1-400.0 mu M. The limit of detection was down to 0.32 nM (S/N = 3). In addition, this modified electrode was successfully applied to the detection of DA in real urine and serum samples by using standard adding method, showing its promising application in the electroanalysis of real samples. (C) 2015 Elsevier B.V. All rights reserved.
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