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首页> 外文期刊>RSC Advances >Facile fabrication of three-dimensional graphene microspheres using beta-cyclodextrin aggregates as substrates and their application for midecamycin sensing
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Facile fabrication of three-dimensional graphene microspheres using beta-cyclodextrin aggregates as substrates and their application for midecamycin sensing

机译：以β-环糊精聚集体为底物的三维石墨烯微球的简便制备及其在米卡霉素检测中的应用

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摘要

Three-dimensional (3D) graphene (GR) microspheres have been successfully prepared for the first time using a simple, easy and green method using beta-cyclodextrin aggregates (beta-CDAs) as substrates, which could be easily obtained from concentrated aqueous solutions of beta-CD. The 3D GR/beta-CDAs composites synthesized were characterized using scanning electron microscopy, transmission electron microscopy, ultraviolet/visible spectroscopy, and Raman spectroscopy. A possible formation mechanism was derived. The as-prepared 3D GR/beta-CDAs microspheres provided multidimensional electron transport pathways, and this has been exploited in an electrode material for the electrocatalytic oxidation of midecamycin (MD), a widely used macrolide antibiotic. Electrochemical results indicated that the as-prepared 3D GR/beta-CDAs microspheres exhibited a higher electrocatalytic activity towards MD oxidation than two-dimensional (2D) GR or beta-CDAs, which could be mainly attributed to the improved electrical properties and large surface area of the composite and the high recognition and enrichment capability of beta-CDAs. Under optimal conditions, the peak currents on a 3D GR/beta-CDA microsphere modified electrode increased linearly with the concentration of MD in the range 0.07-250 mu M. The detection limit of MD reached 20 nM (S/N = 3). The present method is promising for the synthesis of high-performance catalysts for sensors, fuel cells and gas-phase catalysis.
机译：使用β-环糊精聚集体（β-CDA）作为底物的简单，易用和绿色方法首次成功地成功制备了三维（3D）石墨烯（GR）微球，可以从浓缩的β-CD。使用扫描电子显微镜，透射电子显微镜，紫外/可见光谱和拉曼光谱对合成的3D GR /β-CDA复合材料进行表征。得出了可能的形成机理。所制备的3D GR /β-CDA微球提供了多维电子传输途径，这已在电极材料中被开发出来，用于广泛使用的大环内酯类抗生素米卡霉素（MD）的电催化氧化。电化学结果表明，与二维（2D）GR或β-CDA相比，制备的3D GR /β-CDA微球对MD氧化表现出更高的电催化活性，这主要归因于改善的电性能和较大的表面积β-CDA的合成及其高识别和富集能力的优势。在最佳条件下，3D GR /β-CDA微球修饰电极上的峰值电流随MD浓度在0.07-250μM范围内线性增加。MD的检出限达到20 nM（S / N = 3）。本方法有望用于传感器，燃料电池和气相催化的高性能催化剂的合成。

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