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: Physical and Electrical Performance of Vapor–Solid Grown ZnO Straight Nanowires | Nanoscale Res Lett 2009 4 165-168 DOI s11671-008-9218-1 NANO EXPRESS Physical and Electrical Performance of Vapor-Solid Grown ZnO Straight Nanowires J. Y. Li H. Li Received 14 October 2008 Accepted 11 November 2008 Published online 3 December 2008 to the authors 2008 Abstract Physical and electrical properties of wurtzitic ZnO straight nanowires grown via a vapor-solid mechanism were investigated. Raman spectrum shows four first-order phonon frequencies and a second-order Raman frequency of the ZnO nanowires. Electrical and photoconductive performance of individual ZnO straight nanowire devices was studied. The results indicate that the nanowires reported here are n-type semi-conductors and UV light sensitive and a desirable candidate for fabricating UV light nanosensors and other applications. Keywords Nanostructures Nanosensors ZnO Introduction Wurtzite structure zinc oxide ZnO is a very important II-VI group semiconductor. It has a direct wide bandgap of eV higher exciton binding energy 60 meV for ZnO vs. 28 meV for GaN and higher optical gain 300 cm-for ZnO versus 100 cm-1 for GaN at room temperature 1-4 . Recently ZnO has attracted extensive interest for its applications in numerous fields. It is of interest for low-voltage and short wavelength green or green blue electro-optical devices such as light emitting diodes and laser diodes. It also can be widely used as transparent ultraviolet UV -protection films transparent conducting oxide J. Y. Li H Department of Physical Chemistry University of Science and Technology Beijing Beijing China e-mail physchemustb@ H. Li Institute of Microstructure and Properties of Advanced Material Beijing University of Technology Beijing China materials piezoelectric materials electron-transport medium for solar cells chemical sensors photo-catalysts and so on 1-4 . In the past few years extensive reports regarding the study of ZnO nanowires continue at a dizzying pace for their great prospects in fundamental
