tailieunhanh - Báo cáo hóa học: " Template-free Synthesis of One-dimensional Cobalt Nanostructures by Hydrazine Reduction 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: ITemplate-free Synthesis of One-dimensional Cobalt Nanostructures by Hydrazine Reduction Route | Zhang et al. Nanoscale Res Lett 2011 6 58 http content 6 1 58 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Template-free Synthesis of One-dimensional Cobalt Nanostructures by Hydrazine Reduction Route 1 2 1 -71 1 r- 71 1 Liying Zhang Tianmin Lan Jian Wang Liangmin Wei Zhi Yang Yafei Zhang Abstract One-dimensional cobalt nanostructures with large aspect ratio up to 450 have been prepared via a template-free hydrazine reduction route under external magnetic field assistance. The morphology and properties of cobalt nanostructures were characterized by scanning electron microscopy X-ray diffractometer and vibrating sample magnetometer. The roles of the reaction conditions such as temperature concentration and pH value on morphology and magnetic properties of fabricated Co nanostructures were investigated. This work presents a simple low-cost environment-friendly and large-scale production approach to fabricate one-dimensional magnetic Co materials. The resulting materials may have potential applications in nanodevice catalytic agent and magnetic recording. Introduction In recent years nanostructure materials have been actively studied due to their novel properties and potential applications. Among them much attention has been focused on one-dimensional 1D magnetic materials such as Fe Co and Ni due to their potential applications in nanodevice biosensor and magnetic recording 1-3 . 1D cobalt nanostructures with uniform shape and high purity have become increasingly required for specific uses in many areas such as in high-density information storage magnetic sensors commercial batteries and catalysts. Various approaches have been developed to synthesize cobalt nanostructures 4-6 . For example Puntes et al. prepared Co nanodisks by rapid decomposition of carbonyl cobalt in the presence of trioctylphosphane TOP and oleic acid OA 7 . Legrand et al. applied a physical method to synthesize 3D supra-organization of