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: ZnO Nanorods via Spray Deposition of Solutions Containing Zinc Chloride and Thiocarbamide | Nanoscale Res Lett 2007 2 391-396 DOI s11671-007-9072-6 NANO EXPRESS ZnO Nanorods via Spray Deposition of Solutions Containing Zinc Chloride and Thiocarbamide Tatjana Dedova Olga Volobujeva Jelena Klauson Arvo Mere Malle Krunks Received 16 May 2007 Accepted 12 June 2007 Published online 19 July 2007 to the authors 2007 Abstract In this work we present the results on formation of ZnO nanorods prepared by spray of aqueous solutions containing ZnCl2 and thiocarbamide tu at different molar ratios. It has been observed that addition of thiocarbamide into the spray solution has great impact on the size shape and phase composition of the ZnO crystals. Obtained layers were characterized by scanning electron microscopy SEM equipped with energy selected backscattered electron detection system ESB X-ray diffraction XRD and photoluminescence spectroscopy PL . Small addition of thiocarbamide into ZnCl2 solution ZnCl2 tu 1 supports development of significantly thinner ZnO nanorods with higher aspect ratio compared to those obtained from ZnCl2 solution. Diameter of ZnO rods decreases from 270 to 100 nm and aspect ratio increases from to 12 spraying ZnCl2 and ZnCl2 tu solutions respectively. According to XRD well crystallized 002 orientated pure wurtzite ZnO crystals have been formed. However tiny spot like formations of ZnS were detected on the side planes of hexagonal rods prepared from the thiocarbamide containing solutions. Being adsorbed on the side facets of the crystals ZnS inhibits width growth and promotes longitudinal c-axis growth. Keywords ZnO nanorods Spray pyrolysis Thiocarbamide Zinc chloride Growth mechanism SEM PL T. Dedova El O. Volobujeva J. Klauson A. Mere M. Krunks Department of Materials Science Tallinn University of Technology Ehitajate tee 5 Tallinn 19086 Estonia e-mail dedova@ Introduction One-dimensional zinc oxide ZnO nanostructures have been the subject of intense research in the past few years due to their unique properties
