tailieunhanh - Báo cáo hóa học: " Ultra-fast Microwave Synthesis of ZnO Nanowires and their Dynamic Response Toward Hydrogen Gas"

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: Ultra-fast Microwave Synthesis of ZnO Nanowires and their Dynamic Response Toward Hydrogen Gas | Nanoscale Res Lett 2009 4 948-954 DOI S11671-009-9317-7 NANO PERSPECTIVES Ultra-fast Microwave Synthesis of ZnO Nanowires and their Dynamic Response Toward Hydrogen Gas Ahsanulhaq Qurashi N. Tabet M. Faiz Toshinari Yamzaki Received 12 February 2009 Accepted 6 April 2009 Published online 25 April 2009 to the authors 2009 Abstract Ultra-fast and large-quantity grams synthesis of one-dimensional ZnO nanowires has been carried out by a novel microwave-assisted method. High purity Zinc Zn metal was used as source material and placed on microwave absorber. The evaporation oxidation process occurs under exposure to microwave in less than 100 s. Field effect scanning electron microscopy analysis reveals the formation of high aspect-ratio and high density ZnO nanowires with diameter ranging from 70 to 80 nm. Comprehensive structural analysis showed that these ZnO nanowires are single crystal in nature with excellent crystal quality. The gas sensor made of these ZnO nanowires exhibited excellent sensitivity fast response and good reproducibility. Furthermore the method can be extended for the synthesis of other oxide nanowires that will be the building block of future nanoscale devices. Keywords ZnO Microwave synthesis Nanowires FeSeM TEM XPES H2 gas sensor Introduction Fabrication of nanowires has received remarkable attention as these one dimensional 1D nanostructures provide an ideal system to investigate the dependence of transport A. Qurashi El T. Yamzaki Department of Engineering Toyama University 3190 Gofuku Toyama 930-8555 Japan e-mail ahsanulhaq06@ N. Tabet M. Faiz Surface Science Laboratory Department of Physics and Center of Research Excellence in Nanotechnology King Fahd University of Petroleum and Minerals Dhahran Saudi Arabia properties on size confinement 1 . Nanowires nanorods are also expected to play an important role as active components or interconnects in fabricating nanoscale electronics and optoelectronics 2-6 . Zinc oxide ZnO a wide .