摘要
以93W-4.9Ni-2.1Fe混合粉末为原料,采用无衬底和钼（Mo）衬底两种条件制备钨（W）晶须,并探讨其生长机理.分别采用扫描电镜、X射线能谱仪、场发射扫描电镜、透射电镜和X射线衍射仪对产物形貌、元素分布和物相等进行测试分析.研究表明,在无衬底和Mo衬底条件下均能得到表面形貌良好,无明显缺陷,直径约200~400 nm,长径比达100以上的W晶须,且Mo衬底能促进W晶须的生成,少量的Mo原子进入W晶格,可取代晶胞中的W原子,形成连续固溶体,使晶胞参数减小.
Tungsten whiskers were prepared using 93W-4.9Ni-2.1Fe mixed powders as raw material with or without molybdenum as substrate.And its growth mechanism was investigated.Morphology,distribution of elements and phase were measured by scanning electron microscope（SEM）,energy disperse spectroscopy（EDS）,field emission scanning electron microscope（FE-SEM）,transmission electron microscope（TEM） and X-ray diffraction（XRD）.Results show that the as-produced tungsten whiskers had good surface,no defects,large aspect ratio（over 100） and a diameter of 200～400 nm.When using molybdenum as substrate,molybdenum atoms accelerated the formation of tungsten whiskers.A few atoms in lattice of tungsten unit cell were replaced by molybdenum atoms.And complete,solid solution was formed,it made the cell parameter of tungsten whiskers smaller.
出处
《深圳大学学报（理工版）》
EI
CAS
北大核心
2011年第2期183-188,共6页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(50774098)~~
关键词
纳米材料
纳米线
钨晶须
钼衬底
晶体生长
金属催化
nanomaterials
nanowires
tungsten whisker
molybdenum substrate
crystal growth
catalytic synthesis
