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Gold Nanoparticles Decorated Graphene as a High Performance Sensor for Determination of Trace Hydrazine Levels in Water
Electroanalysis ( IF 2.7 ) Pub Date : 2018-04-14 , DOI: 10.1002/elan.201800125
Hatem M. A. Amin 1 , Maher F. El-Kady 2 , Nada F. Atta 1 , Ahmed Galal 1
Affiliation  

Electrochemical sensors provide a selective, sensitive and an easy approach to detect hazardous substances such as hydrazine. Herein, we investigate a facile route for the fabrication of a nanostructured composite based on Au nanoparticles (AuNPs) decorated graphene and present its sensing performance towards hydrazine. Our strategy involves electrophoretic deposition (EPD) of graphene oxide (GO) on Au substrate to obtain a uniform layer EPD‐GO, followed by electrochemical reduction of GO to yield high quality graphene ERGO and electrodeposition of monodispersed AuNPs on ERGO (AuNPs/ERGO/Au). The modified AuNPs/ERGO/Au electrode was characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT‐IR) techniques. The sensor exhibited an improved catalytic activity with a peak potential of +87 mV (vs. Ag/AgCl) for hydrazine oxidation. The high performance of this hybrid electrode is due to the presence of a synergistic effect between AuNPs and ERGO at their interface. Insights into the mechanism and kinetics of hydrazine oxidation are withdrawn from varying the voltage scan rate as the reaction is fully irreversible and diffusion‐controlled. The proposed hydrazine sensor showed suitability for nanomolar detection (detection limit of 74 nM), high selectivity in the presence of common ions and efficiency for application in water samples.

中文翻译:

金纳米粒子装饰石墨烯作为测定水中痕量肼含量的高性能传感器

电化学传感器提供了一种选择性,灵敏和简便的方法来检测有害物质,例如肼。在本文中,我们研究了一种基于Au纳米颗粒(AuNPs)装饰的石墨烯的纳米结构复合材料制造的简便途径,并提出了其对肼的传感性能。我们的策略包括在Au基底上电泳沉积氧化石墨烯(GO)以获得均匀的EPD-GO层,然后通过电化学还原GO生成高质量的石墨烯ERGO,并在ERGO上电沉积单分散的AuNP(AuNPs / ERGO /金)。使用扫描电子显微镜(SEM)和傅里叶变换红外光谱(FT-IR)技术对修饰的AuNPs / ERGO / Au电极进行表征。该传感器具有+87 mV(vs. Ag / AgCl)进行肼氧化。这种混合电极的高性能归因于AuNP和ERGO之间在界面处存在协同效应。由于反应是完全不可逆的且受扩散控制的,因此通过改变电压扫描速率就无法了解肼氧化的机理和动力学。拟议的肼传感器显示出适用于纳摩尔浓度的检测(检测限为74 nM),在存在常见离子的情况下具有很高的选择性以及在水样中的应用效率。由于反应是完全不可逆的且受扩散控制的,因此通过改变电压扫描速率就无法了解肼氧化的机理和动力学。拟议的肼传感器显示出适用于纳摩尔浓度的检测(检测限为74 nM),在存在常见离子的情况下具有很高的选择性以及在水样中的应用效率。由于反应是完全不可逆的且受扩散控制的,因此通过改变电压扫描速率就无法了解肼氧化的机理和动力学。所提出的肼传感器显示出适用于纳摩尔浓度的检测(检测限为74 nM),在存在常见离子的情况下具有很高的选择性以及在水样中的应用效率。
更新日期:2018-04-14
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