O_2分子在Al(110)表面选择吸附性的对比研究  

Comparative Study on the Selective Adsorption of O_2 on Al(110) Surface

作　　者：陈倩[1] 炎正馨[1] 闫东芝[1] 龚安[1] 廖谦[1] 王永胜[1] 

机构地区：[1]西安科技大学理学院,西安710054

出　　处：《材料导报》2015年第16期137-141,155,共6页Materials Reports

基　　金：国家自然科学基金(11405127;11404527);陕西省科技厅自然科学基金(2015JM1027)

摘　　要：采用密度泛函理论中广义梯度近似(GGA)计算方法对比分析了O2分子在Al(110)面3个不同吸附位(顶位、桥位和穴位)的吸附性质,通过吸附能的比较,桥位的吸附能高于顶位和穴位,是最佳的吸附位。吸附质的态密度、吸附物O2分子轨道电荷分布的变化以及金属表面原子轨道电荷分布的变化揭示了吸附过程中电荷的转移趋势。计算结果表明,通过分析吸附质的原子轨道电荷分布和电子态密度,发现O2在Al(110)表面吸附的过程中,主要是O原子的2P轨道和Al的3S轨道的电子相互作用,并展示出较强的化学吸附。The adsorptive characters of O2 on Al （1 10）surface at three different sits （top,bridge and hollow） were investigated by using the generalized gradient approximation （GGA）based on density functional theory （DFT）. By comparing the adsorption energies,it is able to deduce that the bridge site is the most favored site because its ad-sorption energy is larger than that at top and hollow site.The transfer trend of the charge in the progress of the ad-sorption is revealed by the density of states of adsorbate,orbital charge population change of O2 molecule and atomic orbital charge population change of metal surface.The conclusion is made that the main interaction in the process of O2 adsorption on Al （1 10）surface come from the 2P orbit of oxygen atom and 3S orbit of aluminum by analyzing the atomic orbital charge population and the electronic density of states of adsorbate,and there is a strong chemical ad-sorption between them.

关 键 词：Al(110)表面 O2 化学吸附 密度泛函理论 

分 类 号：O561.1[理学—原子与分子物理]