【摘要】 以电浆电弧为加热源蒸发钨靶材,外加一套吹气装置,通过气凝合成机制制备氧化钨纳米棒,分别探讨腔体压力与纳米棒平均直径及产率的关系.研究结果显示,W5O14纳米棒的平均直径和产率都随着腔体压力增加.当腔体压力从26.7增至101.3kPa时,粉末产率由0.383增至0.729g/h,平均直径从13.2增加到28.4nm.由透射电子显微镜的观察可知氧化钨纳米棒为单晶结构,晶格平均间距(d-spacing)为0.38nm,晶面以[010]方向来成长,成长机制可透过气-固相(Vapor-Solid,VS)模型来作解释.更多还原

【Abstract】 In the present study,tungsten oxide nanorods were prepared by a plasma arc gas condensation technique where a gas nozzle was introduced to provide blowing gas.With the aid of the blowing gases,tungsten oxide nanorods can be prepared under various chamber pressures ranging from 26.7 to 101.3 kPa.The diameter and production rate of the nanorods are proportional increase to chamber pressure.For the chamber pressure from 26.7 to 101.3 kPa,the production rate of the nanorods is significantly increased from 0.383 to 0.729 g/h.In addition,the mean grain size only changes from 13.2 to 28.4 nm.The tansimission electron microscope(TEM) images reveal that tungstan oxide nanorod is the single crystalline structure with the lattice spacing of 0.38 nm and the growth of crystal plane is along [010].The vapor-solid model is preferred to explain the growth mechanism.更多还原