Effects of bimetallic catalysts on synthesis of nitrogen-doped carbon nanotubes as nanoscale energetic materials

作     者：Hao Liu Yong Zhang Ruying Li Xueliang Sun Hakima Abou-Rachid 

作者机构：Department of Mechanical and Materials Engineering University of Western Ontario London ON N6A 5B9 Canada Defense Research ＆ Development Canada 2459 Boulevard PieXI Nord Quebec QC G3J IX5 Canada 

出 版 物：《Particuology》 (颗粒学报（英文版）)

年 卷 期：2011年第9卷第5期

页      面：465-470页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：加拿大自然科学与工程研究理事会(NSERC)项目 加拿大自然科学与工程研究理事会(NSERC)项目 Canada Foundation for Innovation (CFI) Ontario Research Fund (ORF) Ontario Early Researcher Award (ERA) The University of Western Ontario 

主　　题：Nitrogen doped carbon nanotubes Chemical vapor deposition Bimetallic catalyst 

摘      要：Well aligned nitrogen-doped carbon nanotubes （CNx-NTs）, as energetic materials, are synthesized on a silicon substrate by aerosol-assisted chemical vapor deposition, Tungsten （W） and molybdenum （Mo） metals are respectively introduced to combine with iron （Fe） to act as a bimetallic co-catalyst layer. Cor- relations between the composition and shape of the co-catalyst and morphology, size, growth rate and nitrogen doping amount of the synthesized CNx-NTs are investigated by secondary and backscattered electron imaging in a field emission scanning electron microscope （FESEM） and X-ray photoelectron spectrometer （XPS）. Compared to pure iron catalyst, W-Fe co-catalyst can result in lower growth rate, larger diameter and wider size distribution of the CNx-NTs; while incorporation of molybdenum into the iron catalyst layer can reduce the diameter and size distribution of the nanotubes. Compared to the sole iron catalyst, Fe-W catalyst impedes nitrogen doping while Fe-Mo catalyst promotes the incorporation of nitrogen into the nanotubes. The present work indicates that CNx-NTs with modulated size, growth rate and nitrogen doping concentration are expected to be synthesized by tuning the size and composition of co-catalysts, which may find great potential in producing CNx-NTs with controlled structure and properties,