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Báo cáo hóa học: " Well-aligned Nickel Nanochains Synthesized by a Template-free Route"

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: Well-aligned Nickel Nanochains Synthesized by a Template-free Route | Nanoscale Res Lett 2010 5 597-602 DOI 10.1007 s11671-009-9512-6 NANO EXPRESS Well-aligned Nickel Nanochains Synthesized by a Template-free Route Pengwei Li Rongming Wang Weimeng Chen Chinping Chen Xingyu Gao A. T. S. Wee Received 3 November 2009 Accepted 10 December 2009 Published online 25 December 2009 The Author s 2009. This article is published with open access at Springerlink.com Abstract Highly uniform and well-aligned one-dimensional Ni nanochains with controllable diameters including 33 78 and 120 nm have been synthesized by applying an external magnetic field without any surface modifying agent. The formation can be explained by the interactions of magnetic dipoles in the presence of applied magnetic field. Magnetic measurements demonstrate that the shape anisotropy dominates the magnetic anisotropy. The demagnetization factor AN is in the range of 0.23-0.36. Keywords Ni nanostructure Magnetic anisotropy X-ray absorption spectroscopy Electron microscopy Introduction In the past few years magnetic nanostructures have aroused considerable interests due to their exceptional properties and potential applications in catalysis sensors P. Li R. Wang Key Laboratory of Micro-Nano Measurement-Manipulation and Physics Ministry of Education and Department of Physics Beijing University of Aeronautics and Astronautics 100191 Beijing People s Republic of China e-mail rmwang@buaa.edu.cn W. Chen C. Chen Department of Physics Peking University 100871 Beijing People s Republic of China e-mail cpchen@pku.edu.cn X. Gao A. T. S. Wee Departments of Physics National University of Singapore Singapore 117542 Republic of Singapore high-density magnetic records bio-imaging and many other domains 1-6 . Because most physical and chemical properties of these nanoparticles depend on their sizes and shapes the shape control of nanostructures has become a new and interesting research field 7-9 . In particular onedimensional 1D magnetic nanostructures have become one of the focused points .