tailieunhanh - Báo cáo hóa học: " Self Assembly and Properties of C:WO3 Nano-Platelets and C:VO2/V2O5 Triangular Capsules Produced by Laser Solution Photolysis"

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: Self Assembly and Properties of C:WO3 Nano-Platelets and C:VO2/V2O5 Triangular Capsules Produced by Laser Solution Photolysis | Nanoscale Res Lett 2010 5 389-397 DOI s11671-009-9494-4 NANO EXPRESS Self Assembly and Properties of C WO3 Nano-Platelets and C VO2 V2O5 Triangular Capsules Produced by Laser Solution Photolysis B. W. Mwakikunga A. Forbes E. Sideras-Haddad M. Scriba E. Manikandan Received 24 October 2009 Accepted 11 November 2009 Published online 1 December 2009 The Author s 2009. This article is published with open access at Abstract Laser photolysis of WCl6 in ethanol and a specific mixture of V2O5 and VCl3 in ethanol lead to carbon modified vanadium and tungsten oxides with interesting properties. The presence of graphene s aromatic rings from the vibrational frequency of 1 600 cm-1 together with C-C bonding of carbon from the Raman shift of 1 124 cm-1 present unique optical vibrational electronic and structural properties of the intended tungsten trioxide and vanadium dioxide materials. The morphology of these samples shows nano-platelets in WOx samples and in VOx samples encapsulated spherical quantum dots in B. W. Mwakikunga El A. Forbes CSIR National Laser Centre P. O. Box 395 Pretoria 0001 South Africa e-mail bmwakikunga@ A. Forbes e-mail aforbes1@ B. W. Mwakikunga E. Sideras-Haddad DST NRF Centre of Excellence in Strong Materials and School of Physics University of the Witwatersrand Johannesburg South Africa B. W. Mwakikunga Department of Physics University of Malawi-The Polytechnic Private Bag 303 Chichiri Blantyre 3 Malawi E. Sideras-Haddad iThemba LABS Private Bag 11 Wits 2050 Jan Smuts Empire Rd. Johannesburg South Africa A. Forbes School of Physics University of Kwazulu-Natal Private Bag X54001 Durban 4000 South Africa M. Scriba E. Manikandan DST CSIR National Centre for Nano-Structured Materials P. O. Box 395 Pretoria South Africa conjunction with fullerenes of VOx. Conductivity studies revealed that the VO2 V2O5 nanostructures are more sensitive to Cl than to the presence of ethanol whereas the C WO3 nano-platelets are .