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Al掺杂BN纳米管与气体分子的吸附作用
发表时间:2010-02-15 浏览量:1830 下载量:597
全部作者: | 刘向东,李峰,赵明文,夏曰源 |
作者单位: | 山东大学物理学院;山东大学晶体材料国家重点实验室;泰山学院物理与电子工程学院 |
摘 要: | 采用密度泛函理论研究Al吸附在单壁BN纳米管上产生的缺陷结构的稳定构型、电子结构以及含有该缺陷的BN纳米管与气体分子的相互作用。研究发现:Al吸附可以增强BN纳米管的反应活性,CO分子既可以物理吸附,也可以化学吸附在BN纳米管管壁上;吸附CO分子的BN纳米管的电子结构和导电性发生明显变化,表明BN纳米管对CO气体具有敏感性。同时发现:H2与BN纳米管的作用较弱,BN纳米管的电子结构改变也不明显,这显示BN纳米管的气敏特性具有明显的选择性,对H2敏感性较低。 |
关 键 词: | 凝聚态物理;BN纳米管;密度泛函理论;金属掺杂;气体吸附 |
Title: | Theoretical study of gas adsorption on Al�doped BN nanotubes |
Author: | LIU Xiangdong, LI Feng, ZHAO Mingwen, XIA Yueyuan |
Organization: | School of Physics, Shandong University;State Key Laboratory of Crystal Materials, Shandong University;School of Physics and Electronic Engineering, Taishan University |
Abstract: | Using density functional theory, explores the stable configurations and electronic structures of Al�doped single�walled BN nanotubes (BNNTs) and their interactions with gas molecules, such as H2 and CO. It is found that the Al�doped BNNTs are more active than the pristine ones, giving rise to either chemical or physical adsorption of CO. More interestingly, the electronic properties of Al�doped BNNTs can be greatly modified by the CO adsorption. By contrast, the interaction between Al�doped BNNTs and H2 molecule is very weak and the electronic structure modification is unremarkable. Base on these results, Al�doped BNNTs is proposed as gas sensitive materials with high selectivity and performance to detect CO gas. |
Key words: | condensed matter physics; BN nanotubes; density functional theory; metal doped; gas adsorption |
发表期数: | 2010年2月第3期 |
引用格式: | 刘向东,李峰,赵明文,等. Al掺杂BN纳米管与气体分子的吸附作用[J]. 中国科技论文在线精品论文,2010,3(3):250-255. |
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