Abstract
The VxOy material is fabricated by alternating multilayer of V/V2O5. Two sets of VxOy are presented annealed at 300°C and 400°C for 20, 30 and 40min. We have determined optical absorption spectra of the two sets by comparison between experimental and theoretical PDS amplitude signal. In fact, a variation of the bandgap energy from 2.34eV to 2.49eV has found for both set annealed at 300°C and 400°C for various annealing time. The variation of bandgap energy is discussed testifying a structural and compositional change. Moreover, thermal conductivity of the set annealed at 400°C showed a variation from 1.96W/mK to 6.2W/mK noting a decrease up to 2.89W/mK for that annealed for 30min.