Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Selective Growth of Vertical-aligned ZnO Nanorod Arrays on Si Substrate by Catalyst-free Thermal Evaporation | Nanoscale Res Lett 2008 3 309-314 DOI s11671-008-9156-y NANO EXPRESS Selective Growth of Vertical-aligned ZnO Nanorod Arrays on Si Substrate by Catalyst-free Thermal Evaporation H. Wang Z. P. Zhang X. N. Wang Q. Mo Y. Wang J. H. Zhu H. B. Wang F. J. Yang Y. Jiang Received 3 July 2008 Accepted 5 August 2008 Published online 21 August 2008 to the authors 2008 Abstract By thermal evaporation of pure ZnO powders high-density vertical-aligned ZnO nanorod arrays with diameter ranged in 80-250 nm were successfully synthesized on Si substrates covered with ZnO seed layers. It was revealed that the morphology orientation crystal and optical quality of the ZnO nanorod arrays highly depend on the crystal quality of ZnO seed layers which was confirmed by the characterizations of field-emission scanning electron microscopy X-ray diffraction transmission electron microscopy and photoluminescence measurements. For ZnO seed layer with wurtzite structure the ZnO nanorods grew exactly normal to the substrate with perfect wurtzite structure strong near-band-edge emission and neglectable deep-level emission. The nanorods synthesized on the polycrystalline ZnO seed layer presented random orientation wide diameter and weak deep-level emission. This article provides a C-free and Au-free method for large-scale synthesis of vertical-aligned ZnO nanorod arrays by controlling the crystal quality of the seed layer. Keywords ZnO Thermal evaporation Nanorod arrays Seed layer Catalyst-free H. Wang Z. P. Zhang X. N. Wang H Q. Mo Y. Wang J. H. Zhu H. B. Wang F. J. Yang Faculty of Physics and Electronic Technology Hubei University Wuhan 430062 People s Republic of China e-mail xnwang2006@ Y. Jiang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Introduction In the recent years quasi-one-dimensional 1D ZnO nanostructures such as nanopores 1 nanowires 2 nanobelts 3 and nanorods 4 have attracted great interest due to .
