TEMPERATURE DEPENDENCE STUDY OF NONCONTACT AFM IMAGES USING MOLECULAR DYNAMICS SIMULATIONS

作     者：HOSSEIN NEJAT PISHKENARI ALI MEGHDARI 

作者机构：Nano-Robotics Laboratory Center of Excellence in Design Robotics and Automation School of Mechanical Engineering Sharif University of Technology Tehran P.O. Box: 11365-9465 Iran 

出 版 物：《International Journal of Modern Physics: Conference Series》 

年 卷 期：2012年第ijmpcs卷第5期

页      面：418-432页

学科分类：07[理学] 0702[理学-物理学] 

主　　题：NC-AFM molecular dynamics simulation Sutton-Chen potential tip-surface interaction force temperature effect 

摘      要：The effect of temperature on the noncontact atomic force microscopy (NC-AFM) surface imaging is investigated with the aid of molecular dynamics (MD) analysis based on the Sutton-Chen (SC) interatomic potential. Particular attention is devoted to the tip and sample flexibility at different temperatures. When a gold coated probe is brought close to the Au (001) surface at high temperatures, the tip and surface atoms are pulled together and their distance becomes smaller. The tip and sample atoms displacement varies in the different environment temperatures and this leads to the different interaction forces. Along this line, to study the effect of temperature on the resulting images, we have employed the well-known NC-AFM model and carried out realistic non-equilibrium MD 3D simulations of atomic scale imaging at different close approach positions to the surface.