Optical and Electrochemical Properties of Two-Dimensional V2O5 Nanoleaves Synthesized by Hot-Filament Metal-Oxide Vapor Deposition (Hfmovd) Method
Duy Van Pham1,2*, Ranjit A. Patil1, Chien-Chih Lai1, Yung Liou2, Yuan-Ron Ma1
1Department of Physics, National Dong Hwa University, Hualien, Taiwan
2Institute of Physics, Academia Sinica, Nankang, Taiwan
* presenting author:Duy Van Pham, email:duypham0611@gmail.com
Two-dimensional (2D) Vanadium pentoxide (V2O5) nanoleaves were synthesized by using Hot-Filament Metal-Oxide Vapor Deposition (HFMOVD) on indium-tin-oxide (ITO) glass substrates at various temperatures for 30 minutes. The surface morphologies of 2D V2O5 nanoleaves were observed by using field-emission scanning electron microscopy (FESEM). The surface properties of sample were investigated by using X-ray photoelectron spectroscopy (XPS). The results obtained after analyzing X-ray diffraction data, indicated that the samples exhibited highly crystalline structure. The optical properties were studied in the wavelength range 300 – 800 nm. The optical band gap Eg of 2D V2O5 nanoleaves is decreased from 2.63 eV to 2.44 eV with increasing of synthesis temperature from 950 0C to 1150 0C, according to the analysis of the absorbance spectra. Electrochemical measurements were investigated by cyclic voltammetry (CV) method. The specific capacitance changed from 250.5 F/g to 320.2 F/g.

Keywords: Hot-filament metal-oxide vapor deposition, V2O5 nanoleaves, Optical properties, Electrochemical properties