Tungsten ozide nanostructures growth in HFCVD system by slow positron beam

摘要：

Tungsten oxide (WOx) nanostructures were prepared by a hot filament chemical vapor deposition (HFCVD) system. Two series of samples were synthesized by adjusting filaments temperature (Tf) and oxygen gas concentration (OGC). The crystallinity and stoichiometry were highly related to Tf and OGC. The evolution of stoichiometry and types of defects was illuminated by slow positron implantation spectroscopy (SPIS). A turning point of Tf=1750℃ was found that at this point the crystallinity and stoichiometry natures were the best. In order to develop the chemical phase from substoichiometric to stoichiometric, the oxygen gas concentration in the mixture gas during deposition should be raised to an appropriate level.

关键词： tungsten ozide nanostructure nanobunlde HFCVD slow positron

作者: J.Lou B.J.Ye X.P.Wang H.M.Weng H.J.Du Z.B.Zhang

作者单位: Department of modern Physics,University of Science and Technology of China,Hefei 230026,P.R.China Department of Physics,University of Puerto Rico,P.O.Box 23343,San Juan,PR 00931,USA

会议类型: 国际会议

会议名称: 第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)

会议地点: 武汉

会议语种:英文

页码: 195-197

在线出版日期: 2008-05-11（万方平台首次上网日期，不代表论文的发表时间）