Synthesis and measurements of the optical bandgap of single crystalline complex metal oxide BaCuV2O7 nanowires by UV-VIS absorption

The synthesis of single crystalline complex metal oxides BaCuV2O7 nanowires were attained by using surfactant free, economically favorable chemical solution deposition method. A thin layer of BaCuV2O7 nanocrystals is formed by the decomposition of complex metal oxide solution at 150 °C to provide nucleation sites for the growth of nanowires. The synthesized nanowires were typically 1-5 μm long with diameter from 50 to 150 nm. We showed that by simply controlling the temperature and thickness of the coated film, we can easily obtain high quality BaCuV2O7 nanowires. The UV-VIS absorption spectra show indirect bandgap of 2.65 ± 0.05 eV of nanowires. The temperature-dependent resistances of BaCuV2O7 nanowires agree with the exponential correlation, supporting that the conducting carriers are the quasi-free electrons. We believe that our methodology will provides a simple and convenient route for the synthesis of variety of complex metal oxides nanowires with controlled stoichiometry.