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: Tungsten Oxide Nanorods Array and Nanobundle Prepared by Using Chemical Vapor Deposition Technique | Nanoscale Res Lett 2007 2 405-409 DOI S11671-007-9075-3 NANO EXPRESS Tungsten Oxide Nanorods Array and Nanobundle Prepared by Using Chemical Vapor Deposition Technique X. P. Wang B. Q. Yang H. X. Zhang P. X. Feng Received 16 May 2007 Accepted 15 June 2007 Published online 7 July 2007 to the authors 2007 Abstract Tungsten oxide WO3 nanorods array prepared using chemical vapor deposition techniques was studied. The influence of oxygen gas concentration on the nanoscale tungsten oxide structure was observed it was responsible for the stoichiometric and morphology variation from nanoscale particle to nanorods array. Experimental results also indicated that the deposition temperature was highly related to the morphology the chemical structure however was stable. The evolution of the crystalline structure and surface morphology was analyzed by scanning electron microscopy Raman spectra and X-ray diffraction approaches. The stoichiometric variation was indicated by energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. Keywords Nanostructure Tungsten oxide Nanorod Nanobundle CVD Introduction Nanostructured transition metal oxides are outstanding candidates for a wide range of applications including lithium-ion batteries 1 2 catalysts 3 electrochromic materials 4 5 and sensors. 6 7 Nanostructured tungsten oxide as a typical transition metal oxide material has been researched frequently these years. The nanostructured tungsten oxide material exhibited many excellent properties because of their particular phase structure and huge surface areas which depend greatly on X. P. Wang B. Q. Yang H. X. Zhang P. X. Feng El Department of Physics University of Puerto Rico . Box 23343 San Juan PR 00931 UsA e-mail pfeng@ the experimental parameters. In previous experiment of chemical vapor deposition CVD it was realized that several factors such as filament temperature electrical current gas flow and the composition of gas would affect the .
