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Effect of tip size on force measurement in atomic force microscopy
Leonard T W Lim1, Andrew T S Wee, Sean J O'Shea
1Department of Physics, National University of Singapore, Lower Kent Ridge Road, Singapore 119620.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 13, 2008
Summary
Atomic force microscopy revealed oscillatory solvation forces between graphite and liquids. Force measurements showed a clear trend of decreasing normalized force with increasing tip radius.
Area of Science:
- Surface Science
- Physical Chemistry
- Nanotechnology
Background:
- Understanding solvation forces at solid-liquid interfaces is crucial for predicting molecular interactions.
- Atomic Force Microscopy (AFM) provides a powerful tool for probing forces at the nanoscale.
Purpose of the Study:
- To investigate solvation forces at the highly oriented pyrolytic graphite (HOPG) solid-liquid interface.
- To examine the influence of tip radius on these solvation forces using AFM.
Main Methods:
- Utilized Atomic Force Microscopy (AFM) to measure forces.
- Employed HOPG as the solid substrate.
- Studied interactions with liquids: octamethylcyclotetrasiloxane (OMCTS), n-hexadecane, and n-dodecanol.
- Varied AFM tip radii from 15-100 nm.
Main Results:
- Observed oscillatory solvation forces (F) at the solid-liquid interface.
- Normalized force data (F/Rtip) exhibited differences based on AFM tip radii.
- A consistent trend of decreasing F/Rtip was observed as tip radius (Rtip) increased.
Conclusions:
- Solvation forces at the HOPG-liquid interface are dependent on the tip-sample geometry.
- The observed trend suggests a relationship between surface curvature and solvation force behavior.
- AFM is effective in characterizing nanoscale solvation phenomena and their dependence on experimental parameters.
