形貌可控钒酸铜纳米晶在电化学传感应用上具有非常重要的意义.采用简便的水热合成方法,制备出一系列具有不同形貌的的钒酸铜纳米晶(纳米颗粒,纳米带和纳米花).采用XRD、SEM和循环伏安法(CV)等测试技术,对各种钒酸铜纳米晶产物的物相组成、形貌和电化学性能进行表征.结果表明,Cu3V2O7(OH)2·2H2O(CVOH)晶体的形貌可以通过改变铜盐、表面活性剂种类以及溶液pH值进行调控.采用CVOH纳米晶作为活性材料修饰玻碳电极(GCEs)发现,电极对抗坏血酸的响应性能增强.比较三种不同形貌的钒酸铜纳米晶,纳米带状对电极的增强效应最显著.钒酸铜纳米带修饰GCEs电化学感应抗坏血酸,其CV的峰值电流与其浓度呈正比.因此,CVOH纳米晶体可作为检测抗坏血酸的电化学活性材料.
Morphology-controlled synthesis of copper vanadate nanocrystals is of great significance in electrochemical sensing applications. A facile hydrothermal process for synthesizing copper vanadate nanocrystals with various morphologies (e.g., nanoparticles, nanobelts and nanoflowers) was reported. Phase, morphology and electrochemical performance of the as-synthesized copper vanadate nanocrystals were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and cyclic-voltammogram (CV) techniques. The results revealed that the morphologies of the Cu3V2O7(OH)2·2H2O (CVOH) nanocrystals could be controlled by changing copper salts, surfactants and pH values. The CVOH samples showed enhanced electrochemical response to ascorbic acid. Comparatively, the CVOH nanobelts had the higher electrochemical sensing performance than those of CVOH nanoparticles and nanoflowers. The CVOH-nanobelts-modified GCEs had a linear relationship between the peak currents in their CVs and ascorbic acid concentration. The CVOH nanocrystals can be used as potential electrochemical active materials for the determination of ascorbic acid.
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