Abstract
We report on the synthesis of gallium oxide nanowires by pulsed laser deposition using a gold catalyst. In the vapor-liquid-solid process, gold thickness was the crucial parameter for deciding the morphology of nanowires. In the case of 1 nm thick gold, homogeneous nanowire growth was confirmed at temperatures of 700°C to 850°C. Transmission electron microscopy and selected area electron diffraction measurements showed that the nanowires were polycrystalline. In the cathode luminescence spectra, UV, blue, green and red emission peaks were observed, as reported in previous studies. As growth temperature was increased, the relative intensities of blue, green, and red emissions decreased. Thermal annealing treatments were effective in decreasing the blue, green and red emission peaks, suggesting that these emission peaks were associated with oxygen vacancies.
Highlights
One-dimensional nanostructures, such as nanowires, nanotubes, nanorods, and nanobelts, are attracting much attention due to their novel physical properties and their potential applications as building blocks in nanodevices
We report on the synthesis of gallium oxide nanowires by pulsed laser deposition using a gold catalyst
Atomic force microscopy (AFM) images of the gold catalyst annealed at the nanowire growth temperature (750 ̊C) indicate the variety in nanowire morphology
Summary
One-dimensional nanostructures, such as nanowires, nanotubes, nanorods, and nanobelts, are attracting much attention due to their novel physical properties and their potential applications as building blocks in nanodevices. Several binary metal oxide nanowires such as MgO [1], ZnO [2], In2O3 [3] and SnO2 [4] have been successfully synthesized and their electronic and optical properties have been reported. Ga2O3 nanostructures have been successfully grown by various techniques such as physical evaporation [8], arc discharge [9], thermal chemical vapor deposition [10], and metal organic chemical vapor deposition [11]. We prepared Ga2O3 nanowires by PLD and investigated their morphology, microstructure, and luminescence properties
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