Hydrothermal synthesis and electrochemical sensing properties of copper vanadate nanocrystals with controlled morphologies
(1. School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, China;
2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China)
2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China)
Abstract: 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.
Key words: copper vanadate nanocrystals; hydrothermal synthesis; electrochemical sensors; ascorbic acid