tailieunhanh - Báo cáo hóa học: " Obvious Temperature Difference Along a Pb Cluster-Decorated Carbon Nanowire"

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: Obvious Temperature Difference Along a Pb Cluster-Decorated Carbon Nanowire | Nanoscale Res Lett 2010 5 138-142 DOI s11671-009-9455-y NANO EXPRESS Obvious Temperature Difference Along a Pb Cluster-Decorated Carbon Nanowire Fengqi Song Longbing He Min Han Jianguo Wan Guanghou Wang Received 22 July 2009 Accepted 25 September 2009 Published online 10 October 2009 to the authors 2009 Abstract Pb nanoclusters were deposited onto a suspended carbon nanowire CNW where in situ temperature variable observation was carried out by a transmission electron microscope. The heating temperature was up to 450 C. Both the melting and evaporation of the Pb nanoparticles on the CNW were retarded when compared to the particles on the support frame. The obvious temperature difference of up to 10 K along the CNW of less than 1 m was demonstrated. It was attributed to the irradiating dissipation-dependent on the surface area of the decorating Pb particle by calculation. Keywords Temperature difference Retarded melting Thermal transportation Pb Cluster Carbon nanowire Introduction Much attention has been paid to the sub-micrometer scale thermal transportation along a nanowire mainly due to the scale-dependent carrier behavior upon nanoconfinement and their potential application in the thermoelectric devices Electronic supplementary material The online version of this article doi s11671-009-9455-y contains supplementary material which is available to authorized users. F. Song El J. Wan G. Wang National Laboratory of Solid State Microstructures and Department of Physics Nanjing University 210093 Nanjing China e-mail songfengqi@ L. He M. Han National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering Nanjing University 210093 Nanjing China 0 Springer and thermoresistive coating materials 1-7 . One of the key problems is the temperature difference TD between two ends of the nanowire 8-10 . However the TD on the subnanometer scale or even on a few micrometers keeps rather small. It will diminish to a .