Introduction
Results and Discussion
MnS/Co3S4-ERGO纳米复合材料形貌表征
通过扫描电子显微镜(SEM)观察了MnS/Co3S4-ERGO纳米复合材料的表面形貌。图1A为通过水热反应合成的碱式碳酸钴前驱体,结果可知,前驱体主要呈现束状纳米棒结构,从中心向外延伸,末端呈针状。纳米棒尺寸均匀,直径约为100 nm、长度约为10 μm。图1B显示了Co9S8的SEM图像,可以观察到,Co9S8呈现明显的中空纳米管结构。图1C、D显示了MnS/Co3S4在不同放大倍数下的SEM图像,结果表明,其仍呈中空管状结构,有许多小颗粒突出在管外壁。图1E、F显示了MnS/Co3S4-ERGO在不同放大倍数下的SEM图像。可以看出,MnS/Co3S4纳米颗粒均匀地分散在薄纱状的ERGO中,表明MnS/Co3S4-ERGO通过超声分散可有效地结合。
图1 CO(CO3)0.35Cl0.20(OH)1.10前驱体(A)、Co9S8(B)、MnS/Co3S4(C、D)、MnS/Co3S4 -ERGO纳米复合材料(E、F)SEM图像
香兰素在MnS/Co3S4-ERGO/GCE上的电化学行为
为证实所制备的MnS/Co3S4-ERGO/GCE对香兰素氧化的优异电催化性能,通过循环伏安法比较了香兰素在不同电极上的电化学行为。图2显示了10 mmol/L香兰素在0.05 mol/L HNO3溶液中在不同电极上的循环伏安图。MnS/Co3S4-ERGO/GCE在所有电极中显示出最高的峰值电流,表明MnS/Co3S4和ERGO的协同作用提高了电极对香兰素氧化的催化性能。
图2 GCE(a)、GO/GCE(b)、MnS/Co3S4/GCE(c)、ERGO/GCE(d)、MnS/Co3S4-ERGO/GCE(e)在含1 mmol/L K3Fe(CN)6的0.5 mol/L KCl溶液中的CV曲线(A)和(B)奈奎斯特图
线性范围和检测限
由图3A、B可知,香兰素的氧化电流随着其浓度的增加而增加。由图3C可知,在0.020~1.0、1.0~40 mmol/L的浓度内,香兰素的氧化峰值电流与香兰素浓度之间存在良好的线性关系(图3D、E)。在信噪比为3时,检测限低至4.0 nmol/L。
图3 不同浓度香兰素在在MnS/Co3S4-ERGO/GCE上的二阶导数线性扫描伏安曲线
Conclusion
Manganese cobalt sulfide nanoparticles wrapped by reduced graphene oxide: a fascinating nanocomposite as an efficient electrochemical sensing platform for vanillin determination
aKey Laboratory of Organometallic New Materials, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Department of Chemistry and Material Science, Hengyang Normal University, Hengyang 421008, China
bCollege of Life Science and Chemistry, Hunan University of Technology, Zhuzhou 412007, China
Abstract
In this work, a fascinating nanocomposite based on manganese-cobalt sulfide (MnS/Co3S4) wrapped by electrochemically reduced graphene oxide (ERGO) has been successfully synthesized on the surface of a glassy carbon electrode (GCE) by a facile hydrothermal assisted electrochemical reduction method. The modified electrode was fully characterized by scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy. The morphological results illustrate that MnS/Co3S4 are embedded in the ERGO layers, resulting in a rough surface and three-dimensional (3D) microstructure. The as-synthesized MnS/Co3S4-ERGO/GCE displays distinctly enhanced electrocatalytic activity for vanillin oxidation in comparison with that of the ERGO/GCE and MnS/Co3S4/GCE. Therefore, the MnS/Co3S4-ERGO/GCE can be used as an effective electrochemical sensing platform for the sensitive determination of vanillin, and the fabricated sensor displays a wide linear range of 0.02−1.00 μmol/L and 1.0−40.0 μmol/L, low detection limit of 4.0 nmol/L and satisfactory recoveries between 98.0% and 102.8%.
Reference:
DENG P H, ZHOU C Q, SUN H, et al. Manganese cobalt sulfide nanoparticles wrapped by reduced graphene oxide: a fascinating nanocomposite as an efficient electrochemical sensing platform for vanillin determination[J]. Journal of Future Foods, 2025, 5(2): 162-171. DOI:10.1016/j.jfutfo.2024.05.005.
文章翻译由作者团队提供
编辑:龚艺;责任编辑:孙勇
封面图片来源:摄图网
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