Characterization of Distance-Dependent Damping in Tapping-Mode Atomic Force Microscopy Force Measurements in Liquid

Langmuir ◽  
2004 ◽  
Vol 20 (8) ◽  
pp. 3195-3201 ◽  
Author(s):  
Ijeoma Nnebe ◽  
James W. Schneider
Keyword(s):  
Atomic Force Microscopy ◽  
Force Measurements ◽  
Tapping Mode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mode Atomic Force Microscopy

Characterization of Intermittent Contact in Tapping Mode Atomic Force Microscopy

2005 ◽  
Author(s):  
Xiaopeng Zhao ◽  
Harry Dankowicz
Keyword(s):  
Atomic Force Microscopy ◽  
Nonlinear Effects ◽  
Loss Of Stability ◽  
Tapping Mode ◽  
Force Microscopy ◽  
Strongly Nonlinear ◽  
Atomic Force ◽  
Dynamical Instabilities ◽  
Mode Atomic Force Microscopy

Tapping-mode atomic force microscopy has wide applications for probing the nanoscale surface and subsurface properties of numerous materials in a variety of environments. Strongly nonlinear effects due to large variations in the force field on the probe tip over very small length scales and the intermittency of contact with the sample, however, result in strong dynamical instabilities. These can result in a sudden loss of stability of low-contact-velocity oscillations of the atomic-force-microscope tip in favor of oscillations with high contact velocity, coexistence of stable oscillatory motions, and destructive, nonrepeatable, and unreliable characterization of the nanostructure. In this paper, dynamical systems tools for piecewise smooth systems are employed to characterize the loss of stability and associated parameter hysteresis phenomena.

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