Re-entrant-Groove-Assisted VLS Growth of Boron Carbide Five-Fold Twinned Nanowires  

作　　者：付新 蒋军 刘超 喻志阳 Steffan LEA 袁俊 

机构地区：[1]Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 [2]Beijing National Center for Electron Microscopy, Tsinghua University, Beijing 100084 [3]Department of Physics, University of York, York YOIO 5DD, U.K.

出　　处：《Chinese Physics Letters》2009年第8期230-233,共4页中国物理快报（英文版）

摘　　要：We report a preferential growth of boron carbide nanowires with a five-fold twinned internal structure. The nanowires are found to grow catalytically via iron boron nanoparticles, but unusually the catalytic particle is in contact with the low-energy surfaces of boron carbide with V-shaped contact lines. We propose that this catalytical growth may be caused by preferential nucleation at the re-entrant grooves due to the twinning planes, followed by rapid spreading of atomic steps. This is consistent with the observed temperature dependence of the five-fold twinned nanowire growth.We report a preferential growth of boron carbide nanowires with a five-fold twinned internal structure. The nanowires are found to grow catalytically via iron boron nanoparticles, but unusually the catalytic particle is in contact with the low-energy surfaces of boron carbide with V-shaped contact lines. We propose that this catalytical growth may be caused by preferential nucleation at the re-entrant grooves due to the twinning planes, followed by rapid spreading of atomic steps. This is consistent with the observed temperature dependence of the five-fold twinned nanowire growth.

关 键 词：sea surface nonliear interaction numerical method 

分 类 号：TQ174.758[化学工程—陶瓷工业] TB383[化学工程—硅酸盐工业]