tailieunhanh - Báo cáo hóa học: " Single Crystalline Cadmium Sulfide Nanowires with Branched Structure"

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: Single Crystalline Cadmium Sulfide Nanowires with Branched Structure | Nanoscale Res Lett 2009 4 371-376 DOI s11671-009-9256-3 NANO EXPRESS Single Crystalline Cadmium Sulfide Nanowires with Branched Structure Feng Gao Qingyi Lu Received 25 September 2008 Accepted 8 January 2009 Published online 27 January 2009 to the authors 2009 Abstract In this article we report the synthesis of branched single crystal CdS nanowires. This branched CdS nanostructure is prepared by a simple surfactant-directing method which is of particular interest as it uses readily available reagents and provides a convenient route to high-yield single crystal nanowires but with branched shape. These branched nanowires have an average diameter of about 40 nm and length up to several micrometers. A possible mechanism has been proposed and the addition of surfactant dodecylthiol into the two mixed-solvents would play an importance effect on the structure of the product. Based on the mechanism by controlling the synthesis conditions such as the ratios between the surfactant inorganic solvent and organic solvent other kinds of nanostructures based on CdS nanowires were also prepared. Photoluminescence PL measurement reveals that the branched CdS nanowires have a strong emission at about 700 nm which might be due to its special structure. Keywords Cadmium sulfide Nanowires Branched single crystal Introduction Nanoscale semiconductors have attracted considerable attention in recent decades in both fundamental researches F. Gao H Department of Materials Science and Engineering Nanjing University Nanjing 210093 People s Republic of China e-mail fgao@ Q. Lu State Key Laboratory of Coordination Chemistry Coordination Chemistry Institute Nanjing National Laboratory of Microstructures Nanjing University Nanjing 210093 People s Republic of China and technical applications because of their conspicuous optical and electronic properties 1 . The structures of semiconductor nanocrystallites including size shape and dimension play important roles to determine their