Simultaneous determination of uric acid and dopamine using a carbon fiber electrode modified by layer-by-layer assembly of graphene and gold nanoparticles

IF 2.2 4区 工程技术 Q2 Chemistry Gold Bulletin Pub Date : 2013-05-19 DOI:10.1007/s13404-013-0090-0
Jiao Du, Ruirui Yue, Fangfang Ren, Zhangquan Yao, Fengxing Jiang, Ping Yang, Yukou Du
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引用次数: 67

Abstract

A novel layer-by-layer assembly of graphene sheets and gold nanoparticles modified carbon fiber electrode (GE/Au/GE/CFE) was successfully fabricated and applied to simultaneous determination of dopamine (DA) and uric acid (UA). The structure of GE/Au/GE/CFE was characterized by scanning electron microscopy (SEM). It was observed that the gold nanoparticles were homogeneously assembled between the two layers of GE sheets. Cyclic voltammetry (CV) measurements elucidate that GE/Au/GE/CFE has higher electrocatalytic activity for the oxidation of DA and UA when compared with graphene modified carbon fiber electrode (GE/CFE), and graphene and gold nanoparticles modified carbon fiber electrode (Au/GE/CFE). Simultaneous determination of UA and DA on GE/Au/GE/CFE was conducted with a differential pulse voltammetry technique, and two well-defined and fully resolved anodic oxidation peaks were observed. Anodic oxidation currents of DA and UA are linear with their concentration in the range of 0.59–43.96?μM and 12.6–413.62?μM, respectively. Moreover, the composite electrode displays high reproducibility and selectivity for the determination of UA and DA.

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使用石墨烯和金纳米颗粒逐层组装修饰的碳纤维电极同时测定尿酸和多巴胺
成功制备了一种新型的石墨烯片与金纳米颗粒修饰的碳纤维电极(GE/Au/GE/CFE),并将其应用于同时测定多巴胺(DA)和尿酸(UA)。用扫描电镜(SEM)对GE/Au/GE/CFE的结构进行了表征。结果表明,金纳米粒子在两层GE片之间均匀组装。循环伏安法(CV)测试表明,与石墨烯修饰碳纤维电极(GE/CFE)和石墨烯与金纳米粒子修饰碳纤维电极(Au/GE/CFE)相比,GE/Au/GE/CFE对DA和UA的氧化具有更高的电催化活性。采用差分脉冲伏安法同时测定了GE/Au/GE/CFE上的UA和DA,观察到两个清晰且完全分解的阳极氧化峰。DA和UA的阳极氧化电流在0.59 ~ 43.96?m和12.6-413.62 ?μM,分别。此外,复合电极对UA和DA的测定具有较高的重复性和选择性。
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来源期刊
Gold Bulletin
Gold Bulletin 工程技术-材料科学:综合
CiteScore
3.30
自引率
4.50%
发文量
0
审稿时长
3 months
期刊介绍: Gold Bulletin is the premier international peer reviewed journal on the latest science, technology and applications of gold. It includes papers on the latest research advances, state-of-the-art reviews, conference reports, book reviews and highlights of patents and scientific literature. Gold Bulletin does not publish manuscripts covering the snthesis of Gold nanoparticles in the presence of plant extracts or other nature-derived extracts. Gold Bulletin has been published over 40 years as a multidisciplinary journal read by chemists, physicists, engineers, metallurgists, materials scientists, biotechnologists, surface scientists, and nanotechnologists amongst others, both within industry and academia. Gold Bulletin is published in Association with the World Gold Council.
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