草酸镍前驱体纤维微结构诱导制备多晶态纳米镍纤维的演化机理（英文）

Guidance Evolution Mechanism of Nickel Oxalate Microstructure for Formation of Polycrystalline Nickel Nano-fibers

在离子液相沉淀体系中,通过受限自组装生长可控制备草酸镍纳米纤维。在氩气环境中,在纤维微结构诱导下,通过热分解草酸镍纤维制备出镍纳米纤维。通过X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)等技术检测所得样品的性质。结果表明,氨的存在使草酸镍的生长习性从自由自组装模式转变为了受限自组装模式,制备的草酸镍纤维具有单斜晶体结构,直径100~200 nm,长度为1~5μm。热分解制备的镍纤维表面粗糙,具有面心立方晶体结构,直径100~200 nm,长度为1~5μm。在草酸镍纤维形成的细而长空间的诱导作用下,镍原子经过成核、生长和聚合过程,从而形成纤维状纳米镍。

Nickel oxalate nano-fibers were controllably synthesized via a restricted self-assembly growth process in a liquid phase precipitation system. Nickel nano-fibers were prepared by decomposing nickel oxalate under the guidance of fiber micro-structure in Ar gas atmosphere. The characteristics of the samples were measured by X-ray powder diffraction（XRD）,scanning electron microscope（SEM） and transmission electron microscope（TEM）. Result show that the existence of ammonia changes the growth behavior of nickel oxalate from free self-assembly mode to a restricted one. The nickel oxalate crystal nano-fibers with monoclinic geometry are 100~200 nm in diameter,and 1~5 μm in length. The nickel nano-fibers with face-centered cubic geometry are also 100~200 nm in diameter,and 1~5 μm in length,and the surface is very rough. Nickel nano-fibers are formed via a process of nucleation,grain growth and aggregation under the guidance of long and narrow space provided by nickel oxalate nano-fibers.