Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Effect of Contact Stiffness on Lateral Force Calibration of Atomic Force Microscopy Cantilever

원자 현미경 탐침의 수평방향 힘 교정에 미치는 접촉 강성의 영향

  • Tran, Da Khoa (School of Mechanical Engineering, University of Ulsan) ;
  • Jeon, Ki-Joon (School of Electrical Engineering University of Ulsan) ;
  • Chung, Koo-Hyun (School of Mechanical Engineering, University of Ulsan)
  • Received : 2012.07.16
  • Accepted : 2012.09.03
  • Published : 2012.12.31
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Abstract

Atomic force microscopy (AFM) has been used for imaging surfaces and measuring surface forces at the nano-scale. Force calibration is important for the quantitative measurement of forces at the nano-scale using AFM. Normal force calibration is relatively straightforward, whereas the lateral force calibration is more complicated since the lateral stiffness of the cantilever is often comparable to the contact stiffness. In this work, the lateral force calibrations of the rectangular cantilever were performed using torsional Sader's method, thermal noise method, and wedge calibration method. The lateral optical lever sensitivity for the thermal noise method was determined from the friction loop under various normal forces as well. Experimental results showed that the discrepancies among the results of the different methods were as large as 30% due to the effect of the contact stiffness on the lateral force calibration of the cantilever used in this work. After correction for the effect of contact stiffness, all the calibration results agreed with each other, within experimental uncertainties.

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References

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