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Green synthesis of silver nanoparticles-graphene oxide nanocomposite and its application in electrochemical sensing of tryptophan

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WOS被引频次:78
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成果类型:
期刊论文
作者:
Li, Junhua;Kuang, Daizhi;Feng, Yonglan;Zhang, Fuxing;Xu, Zhifeng;Liu, Mengqin;Wang, Deping
通讯作者:
Li, JH
作者机构:
[Xu, Zhifeng; Li, Junhua; Wang, Deping; Kuang, Daizhi; Feng, Yonglan; Zhang, Fuxing; Liu, Mengqin] Department of Chemistry and Material Science, Hengyang Normal University, 165#, Huangbai Road, Hengyang, Hunan 421008, China
[Xu, Zhifeng; Li, Junhua; Wang, Deping; Kuang, Daizhi; Feng, Yonglan; Zhang, Fuxing; Liu, Mengqin] Key Laboratory of Functional Organometallic Materials of Hunan Province College, Hengyang Normal University, Hengyang, Hunan 421008, China
通讯机构:
[Li, Junhua] Department of Chemistry and Material Science, Hengyang Normal University, 165# Huangbai Road, Hengyang, Hunan 421008, PR China.
语种:
英文
关键词:
Graphene oxide;Silver nanoparticles;Tryptophan sensor;Electrochemical tryptophan detection
期刊:
Biosensors and Bioelectronics
ISSN:
0956-5663
年:
2013
卷:
42
期:
1
页码:
198-206
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:化学;WOS学科类别:Biophysics;Biotechnology & Applied Microbiology;Chemistry, Analytical;Electrochemistry;Nanoscience & Nanotechnology
入藏号:
WOS:000319951700033;EI:20130115862922;PMID:23202352
基金类别:
Education Department of Hunan Province [12C0536, 10K010]; Hengyang Normal University
机构署名:
本校为第一且通讯机构
院系归属:
化学与材料科学学院
摘要:
A new kind of nanocomposite based on silver nanoparticles (AgNPs)/graphene oxide (GO) was conveniently achieved through a green and low-cost synthesis approach using glucose as a reducing and stabilizing agent, and the synthetic procedure can be easily used for the construction of a disposable electrochemical sensor on glassy carbon electrode (GCE). The nanocomposite was detailedly characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and electrochemical impedance spectroscopy (EIS). The experimental results demonstrated that the nanocomposite possessed the specific features of both silver nanoparticles and graphene, and the intrinsic high specific area and the fast electron transfer rate ascribed to the nanohybrid structure could improve its electrocatalytic performance greatly. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were employed to evaluate the electrochemical properties of AgNPs/GO/GCE towards tryptophan, and the AgNPs/GO film exhibited a distinctly higher activity for the electro-oxidation of tryptophan than GO film with tenfold enhancement of peak current. The oxidation mechanism and the kinetic parameters were investigated, and analysis operation conditions were optimized. Under the selected experimental conditions, the oxidation peak currents were proportional to tryptophan concentrations over the range of 0.01 mu M to 50.0 mu M and 50.0 mu M to 800.0 mu M, respectively. The detection limit was 2.0 nM (S/N=3). Moreover, the proposed method is free of interference from tyrosine and other coexisting species. The resulting sensor displays excellent repeatability and long-term stability; finally it was successfully applied to detect tryptophan in real samples with good recoveries, ranging from 99.0% to 103.0%. (C) 2012 Elsevier B.V. All rights reserved.
参考文献:
Bai LZ, 2012, MATER LETT, V68, P399, DOI 10.1016/j.matlet.2011.11.013
Bao Q, 2011, J COLLOID INTERF SCI, V360, P463, DOI 10.1016/j.jcis.2011.05.009
Bard A. J., 2001, ELECTROCHEMICAL METH
Dikin DA, 2007, NATURE, V448, P457, DOI 10.1038/nature06016
Fan Y, 2011, MICROCHIM ACTA, V173, P241, DOI 10.1007/s00604-011-0556-9

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