tailieunhanh - Báo cáo hóa học: " Mesomorphic Lamella Rolling of Au in Vacuum"

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: Mesomorphic Lamella Rolling of Au in Vacuum | Nanoscale Res Lett 2009 4 1286-1296 DOI S11671-009-9394-7 NANO EXPRESS Mesomorphic Lamella Rolling of Au in Vacuum Chang-Ning Huang Shuei-Yuan Chen Pouyan Shen Received 22 June 2009 Accepted 7 July 2009 Published online 18 July 2009 to the authors 2009 Abstract Lamellar nanocondensates in partial epitaxy with larger-sized multiply twinned particles MTPs or alternatively in the form of multiple-walled tubes MWTs having nothing to do with MTP were produced by the very energetic pulse laser ablation of Au target in vacuum under specified power density and pulses. Transmission electron microscopic observations revealed 111 -motif diffraction and low-angle scattering. They correspond to layer interspacing nm and the nearest neighbor distance ca. nm of atom clusters within the layer respectively for the lamella which shows interspacing contraction with decreasing particle size under the influence of surface stress and rolls up upon electron irradiation. The uncapped MWT has nearly concentric amorphous layers interspaced by nm depending on dislocation distribution and becomes spherical onions for surface-area reduction upon electron dosage. Analogous to graphene-derived tubular materials the lamella-derived MWT of Au could have pentagon-hexagon pair at its zigzag junction and useful optoelectronic properties worthy of exploration. Keywords Gold Nanocondensates Lamella Multiple-walled tubes Vacuum . Huang P. Shen El Institute of Materials Science and Engineering Department of Materials and Optoelectronic Science Center for Nanoscience and Nanotechnology National Sun Yat-sen University Kaohsiung Taiwan ROC e-mail pshen@ . Chen Department of Mechanical and Automation Engineering I-Shou University Kaohsiung Taiwan ROC Introduction The motivation of this research is to prove by experiments that a dynamic pulsed laser ablation PLA c process without the presence of stabilizer or liquid such as in vacuum .

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