A Study on Stiffness of Cap of Carbon Nanotube Probe using Quantum Molecular Dynamics

• Main Authors: Chia-Hua Lin, 林佳樺
• Other Authors: Cheng-I Weng
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/12044700192560590134

碩士 === 國立成功大學 === 機械工程學系碩博士班 === 91 === We present a detailed investigation of the deformation mechanism and the spring constants of carbon nanotube probe for AFM tapping mode using Quantum Molecular Dynamics. The working principle of AFM tapping mode is the probe touch precisely to sample surface, less damage to sample surface than contact mode. This spring constants is significant when the probe does not occur local buckling during cap compression. The diameter of tube is discussed in this article. The simulation show that force which make the cap convex to concave is rise linear if diameters less than 8.2Å . On the other hand, the average value is 0.3 nN. The slope of force curve of cap vary with geometry of cap. If diameters greater than 10Å , average value of spring constant of cap of carbon nanotube probe is 0.38nN/Å independent of diameter of tube. Finally, we point out the hard of Quantum Molecular Dynamics and feasibility improve way for our future work.