Thermally actuated tapping mode atomic force microscopy with polymer microcantilevers

Mitra, Bhaskar; Gaitas, Angelo
February 2009
Review of Scientific Instruments;Feb2009, Vol. 80 Issue 2, pN.PAG
Academic Journal
This paper demonstrates a thermally actuated tapping mode atomic force microscopy (AFM) with a polymer cantilever. The cantilever (350×250×3 μm3) is made from polyimide and includes an embedded resistive heater for thermal actuation. The oscillation of the cantilever is due to the stress gradient caused by alternating heating and cooling from the periodic ac excitation of the heater. The tip oscillation amplitude is 5–10 nm in air. The oscillation occurs at 2ω and is a linear function of the applied voltage. The maximum oscillation amplitude is seen at 0.8 Hz with a 3dB frequency of 26 Hz. The damping of the oscillation due to tip-sample interaction is used to image the sample without any optomechanical feedback. Scans with a 200 nm tall grating indicate a resolution comparable to deflection signal from the AFM in contact mode.


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