Rapid microwave assisted synthesis of graphene nanosheets/polyethyleneimine/gold nanoparticle composite and its application to the selective electrochemical determination of dopamine
Rapid microwave assisted synthesis of graphene nanosheets/polyethyleneimine/gold nanoparticle composite and its application to the selective electrochemical determination of dopamine
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DOI：
10.1016/j.talanta.2013.12.003
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发表时间：
2014-03-01
期刊：
影响因子：
6.1
通讯作者：
Jen, Jen-Fon
中科院分区：
文献类型：
--
作者：
Ponnusamy, Vinoth Kumar;Mani, Veerappan;Jen, Jen-Fon
本研究建立了一种简单快速的微波辅助化学还原法制备石墨烯纳米片/聚乙烯烯九/纳米金（GNS/PEI/AuNP）复合材料的方法。PEI是一种阳离子聚合物，在水介质中通过静电相互作用作为氧化石墨烯纳米片（GONSs）的非共价功能化剂，也作为PEI包裹的GNSs上形成aunp的稳定剂。这种制备方法包括一个简单的混合步骤，然后同时微波辅助化学还原GONSs和金离子。制备的复合材料表现出高密度AuNPs的分散，这些AuNPs被密集地装饰在PEI包裹的GNS的大表面积上。利用x射线光电子能谱、粉末x射线衍射、高分辨率透射电子显微镜、场发射扫描电子显微镜和能量色散x射线能谱以及热重分析对所得复合材料的性能进行了表征。制备的GNS/PEI/AuNP复合膜在抗坏血酸存在下对多巴胺的选择性测定具有良好的电催化活性，在电化学传感器中具有潜在的应用前景。所提出的传感器的适用性也证明了测定人类尿液样本中的多巴胺。(C) 2013 Elsevier B.V.版权所有
In this study, a simple and fast microwave assisted chemical reduction method for the preparation of graphene nanosheet/polyethyleneirnine/gold nanoparticle (GNS/PEI/AuNP) composite was developed. PEI, a cationic polymer, was used both as a non-covalent functionalizing agent for the graphene oxide nanosheets (GONSs) through electrostatic interactions in the aqueous medium and also as a stabilizing agent for the formation of AuNPs on PEI wrapped GNSs. This preparation method involves a simple mixing step followed by a simultaneous microwave assisted chemical reduction of the GONSs and gold ions. The prepared composite exhibits the dispersion of high density AuNPs which were densely decorated on the large surface area of the PEI wrapped GNS. X-ray photoelectron spectroscopy, powder X-ray diffraction, high-resolution transmission electron microscopy, field-emission scanning electron microscopy with energy dispersive X-ray spectroscopy, and thermo-gravimetric analysis, were used to characterize the properties of the resultant composite. The prepared GNS/PEI/AuNP composite film exhibited excellent electrocatalytical activity towards the selective determination of dopamine in the presence of ascorbic acid, which showed potential application in electrochemical sensors. The applicability of the presented sensor was also demonstrated for the determination of dopamine in human urine samples. (C) 2013 Elsevier B.V. All rights reserved.