Growth Mechanism and Photonic Behaviours of Nanoporous ZnO Microcheerios
作者： S. Li , Z. W. Li , Y. Y. Tay , J. Armellin , W. Gao
DOI: 10.1021/CG701056Q
关键词:
摘要: Nanoporous ZnO microcheerios were fabricated in a controlled fashion by oxidizing the DC sputtered metallic Zn crystals. The growth mechanism and photonic behavior of materials with such nano/microstructure investigated characterized detail. It was demonstrated that large surface energy caused steps around equator crystals bi-hexagonal pyramid structure is essential for cheerios. In particular, nanoporous acts as scaffold to provide an enormous area further oxidation, resulting composition gradients drive atoms from core via ZnO/Zn interface self-diffusing. Such oriented diffusion gives rise formation microcheerios, which consist nanowhiskers radial orientations, having interesting behavior. As result high efficiency exciton emission visible covers wide span wavelengths 450 900 nm are observed. spectra five individual emissions dominated various mechanisms. can also be tuned precisely manipulating defect chemistry size nanopores synthesis process.
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