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Báo cáo hóa học: "Water-Driven Assembly of Laser Ablation-Induced Au Condensates as Mesomorphic Nano- and Micro-Tubes"

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: Research Water-Driven Assembly of Laser Ablation-Induced Au Condensates as Mesomorphic Nano- and Micro-Tubes | Nanoscale Res Lett 2009 4 1064-1072 DOI 10.1007 S11671-009-9359-X NANO EXPRESS Water-Driven Assembly of Laser Ablation-Induced Au Condensates as Mesomorphic Nano- and Micro-Tubes Chang-Ning Huang Shuei-Yuan Chen Yuyuan Zheng Pouyan Shen Received 22 April 2009 Accepted 24 May 2009 Published online 6 June 2009 to the authors 2009 Abstract Reddish Au condensates predominant atom clusters and minor amount of multiply twinned particles and fcc nanoparticles with internal compressive stress were produced by pulsed laser ablation on gold target in de-ionized water under a very high power density. Such condensates were self-assembled as lamellae and then nano- to micro-diameter tubes with multiple walls when aged at room temperature in water for up to 40 days. The nano- and micro-tubes have a lamellar- and relaxed fcc-type wall respectively both following partial epitaxial relationship with the co-existing multiply twinned nanoparticles. The entangled tubes being mesomorphic with a large extent of bifurcation flexibility opaqueness and surface-enhanced Raman scattering may have potential encapsulated and catalytic label applications in biomedical systems. Keywords Gold Nanocondensates Nanotubes Self-assembly Water Electronic supplementary material The online version of this article doi 10.1007 s11671-009-9359-x contains supplementary material which is available to authorized users. C.-N. Huang Y. Zheng 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@mail.nsysu.edu.tw S.-Y. Chen Department of Mechanical and Automation Engineering I-Shou University Kaohsiung Taiwan ROC Introduction Under ambient pressure condition Au atoms condense in the order of increasing particle size as structural motifs of atom clusters with planar cage or pyramid structures 1-3 an anomalous multiply twinned particle MTP of decahedral .