National Changhua University of Education Institutional Repository : Item 987654321/14170
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 6507/11669
造访人次 : 29938073      在线人数 : 554
RC Version 3.2 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 进阶搜寻

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.ncue.edu.tw/ir/handle/987654321/14170

题名: Synthesis and Characterization of Spiral Carbon Nanofibers Containing Pd Metal Cluster by Using Pd2(dba)3 as Catalyst
作者: Su, C. J.;Hsu, L. S.;Wu, T. W.;Liu, Chia-Jyi;Lin, S. H.
贡献者: 物理學系
关键词: Spiral carbon nanofibers;Pd metal cluster
日期: 2003
上传时间: 2012-09-10T06:13:51Z
出版者: Nano Science and Technology Institute(NSTI)
摘要: The spiral carbon nanofibers consisting of Pd metal cluster were grown by the Pd2(dba)3-catalyzed decomposition of gaseous acetylene on molecular sieves (Linde 13X) support. The microstructure and composition of the spiral carbon nanofibers were characterized by transmission electron microscope (TEM) and selective area diffraction (SAD). Besides the irregularly curved carbon nanotubes, the TEM image shown in Fig. 1 clearly displays two types of spiral structure of the carbon nanofibers, which are distinguished according to their pitch (p) to diameter (2r) ratio, or equivalently, the pitch angle of the helix, j=arctan(p/2pr).1,2 The p and 2r values of a typical type I nanofiber in Fig. 1 are found to be roughly 140 and 70 nm, respectively, which leads to j=32�. Most of the helices observed belong to type I nanofibers. A typical type II nanofiber has p and 2r values of about 110 and 27 nm, respectively, which leads to a large pitch angle (j=52�). The SAD data show that the black spots inside the carbon nanofibers in Fig. 1 are palladium metal (not PdO) clusters of diameters 40-60 nm. This is the fist incorporation of Pd nanoparticles inside carbon nanofibers. These Pd metal clusters show a small hysteresis from magnetization vs. magnetic field data and metallic behavior from resistivity measurement. They will also be studied by synchrotron-radiation-excited photoemission and photoabsorption experiments.
關聯: Technical Proceedings of the 2003 Nanotechnology Conference and Trade Show, Volume3, Chapter 1: Micro and Nano Structuring and Assembly: 13-16
显示于类别:[物理學系] 會議論文

文件中的档案:

档案 大小格式浏览次数
index.html0KbHTML579检视/开启


在NCUEIR中所有的数据项都受到原著作权保护.

 

DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈