“…In the images shown here, the ac frequency was set equal to a contact resonance frequency [28] which entails resonance amplification increasing the contrast and signal-to-noise ratio in an image. Figures 6a and 6b show images in the AFAM and ultrasonic piezo-mode for comparison.…”
“…In the images shown here, the ac frequency was set equal to a contact resonance frequency [28] which entails resonance amplification increasing the contrast and signal-to-noise ratio in an image. Figures 6a and 6b show images in the AFAM and ultrasonic piezo-mode for comparison.…”
“…The piezo-mode technique can also be performed at frequencies in the range of the first free resonance of the cantilever [27]. In the images shown here, the ac frequency was set equal to a contact resonance frequency [28] which entails resonance amplification increasing the contrast and signal-to-noise ratio in an image. Figures 6a and 6b show images in the AFAM and ultrasonic piezo-mode for comparison.…”
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