The force sensitivity of an atomic force microscope is calibrated directly using an in situ realization of primary electrostatic forces ranging from 320 pN to 3.3 nN with accuracy of a few percent. The absolute accuracy of a common atomic force microscope (AFM) force calibration scheme, known as the thermal noise method is evaluated via comparison to the electrostatic calibration. It is demonstrated that the thermal noise method can be applied with great success to yield force measurements with relative standard uncertainties below 5% after application of a geometric correction factor.
Proceedings Title: XIX IMEKO World Congress: Fundamental and Applied Metrology
Conference Dates: September 6-11, 2009
Conference Location: Lisbon, -1
Conference Title: IMEKO XIX World Congress Fundamental
Pub Type: Conferences
Electrostatic, Atomic Force Microscope, Piconewton.