Nie Xue, Zhang Rui, Tang Zheng, Wang Haiyan, Deng Peihong, Tang Yougen
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Key Laboratory of Functional Organometallic Materials of Hunan Provincial Universities, College of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China.
Nanomaterials (Basel). 2020 Jul 11;10(7):1356. doi: 10.3390/nano10071356.
In this paper, CeO nanoparticles were synthesized by the solvothermal method and dispersed uniformly in graphene oxide (GO) aqueous solution by ultrasonication. The homogeneous CeO-GO dispersion was coated on the surface of a glassy carbon electrode (GCE), and the CeO/electrochemically reduced graphene oxide modified electrode (CeO/ERGO/GCE) was obtained by potentiostatic reduction. The results of X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) showed that CeO nanocrystals were uniformly coated by gossamer like ERGO nanosheets. The electrochemical behavior of vanillin on the CeO/ERGO/GCE was studied by cyclic voltammetry (CV). It was found that the CeO/ERGO/GCE has high electrocatalytic activity and good electrochemical performance for vanillin oxidation. Using the second derivative linear sweep voltammetry (SDLSV), the CeO/ERGO/GCE provides a wide range of 0.04-20 µM and 20 µM-100 µM for vanillin detection, and the detection limit is estimated to be 0.01 µM after 120 s accumulation. This method has been successfully applied to the vanillin detection in some commercial foods.
本文采用溶剂热法合成了CeO纳米颗粒，并通过超声处理将其均匀分散在氧化石墨烯（GO）水溶液中。将均匀的CeO-GO分散液涂覆在玻碳电极（GCE）表面，通过恒电位还原得到CeO/电化学还原氧化石墨烯修饰电极（CeO/ERGO/GCE）。X射线衍射（XRD）、能量色散X射线光谱（EDS）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）结果表明，CeO纳米晶体被类似蛛丝的ERGO纳米片均匀包覆。采用循环伏安法（CV）研究了香草醛在CeO/ERGO/GCE上的电化学行为。结果发现，CeO/ERGO/GCE对香草醛氧化具有高电催化活性和良好的电化学性能。利用二阶导数线性扫描伏安法（SDLSV），CeO/ERGO/GCE对香草醛的检测范围为0.04 - 20 μM和20 μM - 100 μM，在120 s富集后检测限估计为0.01 μM。该方法已成功应用于一些商业食品中香草醛的检测。
