| AFM针尖-测试面接触分子动力学研究 |
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| 引用本文： | 田文超,陈贵敏,刘焕玲.AFM针尖-测试面接触分子动力学研究[J].计算物理,2010,27(1):150-156. |
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| 作者姓名： | 田文超 陈贵敏 刘焕玲 |
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| 作者单位： | 西安电子科技大学机电工程学院, 陕西 西安 710071 |
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| 基金项目： | 国家自然科学基金，Xi'an Applied Materials Innovation Fund Application |
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| 摘 要： | 针对AFM针尖-测试面的接触问题,利用分子动力学模拟针尖同测试面间的"跳跃粘附"和"颈缩分离"过程;分析接触力同接触间隙的关系及测试面压力分布;发现分离过程滞后粘附过程;得到接触力大小只与接触区域附近少数原子层有关,且接触区域近处原子受压力、远处受拉力的结论;讨论测试面位错半径同接触力和接触间隙的关系.
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| 关 键 词： | 分子动力学 粘附 分离 原子力显微镜 |
| 收稿时间： | 2008-09-02 |
| 修稿时间： | 2009-03-10 |
Molecular Dynamics Simulation of Contact Force Between Sample and AFM Tip |
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| TIAN Wenchao,CHEN Guimin,LIU Huanling.Molecular Dynamics Simulation of Contact Force Between Sample and AFM Tip[J].Chinese Journal of Computational Physics,2010,27(1):150-156. |
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| Authors: | TIAN Wenchao CHEN Guimin LIU Huanling |
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| Institution: | School of Electro-mechanical Engineering, Xidian University, Xi'an 710071, China |
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| Abstract: | Contact between tip of atomic force microscope(AFM)and tested sample surface is simulated using molecular dynamics(MD).Relationship between contact force and gap is analyzed.Surface pressure distribution is discussed.Phenomena of"jump-to-contact" and "neck-separation" are observed.Hysteresis between contact process and separate process is obtained.Relationship of surface distortion radius with contact force and gap is also discussed.Only atomic layer close to contact area affects the contact force.Surface atoms close to the contact are pressed and those far from the contact are pulled. |
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| Keywords: | molecular dynamics contact force AFM |
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