Fabrication and characterization of tetrapod-like ZnO nanostructures prepared by catalyst-free thermal evaporation |
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Authors: | Libing Feng Aihua Liu Mei Liu Yuying Ma Jing Wei Baoyuan Man |
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Affiliation: | College of Physics and Electronics, Shandong Normal University, Jinan 250014, PR China |
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Abstract: | Tetrapod-like ZnO nanostructures were fabricated on ZnO-coated sapphire (001) substrates by two steps: pulsed laser deposition (PLD) and catalyst-free thermal evaporation process. First, the ZnO films were pre-deposited on sapphire (001) substrates by PLD. Then the ZnO nanostructures grew on ZnO-coated sapphire (001) substrate by the simple thermal evaporation of the metallic zinc powder at 900 °C in the air without any catalysts. The pre-deposited ZnO films by PLD on the substrates can provide growing sites for the ZnO nanostructures. The as-synthesized ZnO nanostructures were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and Fourier transform infrared spectrum (FTIR). The results show that the tetrapod-like ZnO nanostructures are highly crystalline with the wurtzite hexagonal structure. Photoluminescence (PL) spectrum of as-synthesized nanostructures exhibits a UV emission peak at ~ 389 nm and a broad green emission peak at ~ 513 nm. In addition, the growth mechanism of ZnO nanostructures is also briefly discussed. |
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