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Facile Electrodeposition of Hierarchical Co‐Gd2O3 Nanocomposites for Highly Selective and Sensitive Electrochemical Sensing of L–Cysteine
ChemistrySelect ( IF 2.1 ) Pub Date : 2018-03-06 , DOI: 10.1002/slct.201800012
Subramanian Premlatha 1, 2 , Karunagaran Selvarani 3 , Giri Nagasamy Kuppusamy Ramesh Bapu 2
Affiliation  

Metal/metaloxide based composite materials have wide spread applications in electrochemical sensors and fuel cell applications. Hence, the present work is directed towards the fabrication of cost effective and highly sensitive electrode material for cysteine sensing. In this work, Co‐Gd2O3 nanocomposite is prepared by a simple electrodeposition route and used as electrochemical sensor material. The prepared nanocomposite materials are characterized using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X‐ray Diffraction spectroscopy (XRD), Energy dispersive X‐ray spectroscopy (EDX), and X‐ray Photo electron spectroscopy (XPS). SEM images exhibited as hierarchical nanoflakes with open porous structure. EDX analysis showed the presence of cobalt and gadolinium. The reflections at 2θ=330 and 35.70 corresponds to the cubic structured Gd2O3 nanoparticles validated the formation of nanocomposite. Electrooxidation of L‐cysteine on Co and Co‐Gd2O3 was carried out using cyclic voltammetry technique. Upon addition of certain concentration of cysteine, the anodic peak current get increased with the simultaneous decline in the cathodic peak currents displayed the excellent electrocatalytic activity of Co‐Gd2O3 nanocomposite. The chronoamperometric experiments were performed to derive the analytical parameters like sensitivity, limit of detection and linear range. The reproducibility, stability and real sample analysis was studied using chronoamperometry.

中文翻译:

分层Co-Gd2O3纳米复合材料的简便电沉积,可对L-半胱氨酸进行高度选择性和灵敏的电化学传感

基于金属/金属氧化物的复合材料在电化学传感器和燃料电池应用中具有广泛的应用。因此,当前的工作针对用于半胱氨酸感测的成本有效且高度敏感的电极材料的制造。在这项工作中,Co-Gd 2 O 3通过简单的电沉积路线制备纳米复合材料,并将其用作电化学传感器材料。使用扫描电子显微镜(SEM),透射电子显微镜(TEM),X射线衍射光谱(XRD),能量色散X射线光谱(EDX)和X射线光电子光谱(XPS)对制备的纳米复合材料进行表征。SEM图像显示为具有开放的多孔结构的分层纳米薄片。EDX分析表明存在钴和g。在2θ= 33 0和35.7 0处的反射对应于立方结构的Gd 2 O 3纳米颗粒,验证了纳米复合材料的形成。L-半胱氨酸在Co和Co-Gd 2 O 3上的电氧化使用循环伏安法进行。加入一定浓度的半胱氨酸后,阳极峰值电流增加,同时阴极峰值电流下降,这表明Co-Gd 2 O 3纳米复合材料具有出色的电催化活性。进行计时电流法实验以导出分析参数,例如灵敏度,检测极限和线性范围。使用计时电流分析法研究了重现性,稳定性和真实样品分析。
更新日期:2018-03-06
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