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When perform the TappingMode in liquid (using MultiMode, Nanoscope 3a, NP-10 tip), sometimes I get very low quality images. And I check the Amplitude-distance curve. As shown below,
I dont understand why the amplitude increases a lot as the tip approaching to the substrate. I think this artifact may cause the unstable imaging.
I would greatly appreciate your any help. Thanks.
Hi Wang Shuo,
What frequency do you use to excite your tips in fluids?
Regards,
Stefan
I select the resonance peak in the range 7-9 kHz
Hi,
7-9kHz sounds right. Are you using the c-lever out of the 4 cantilevers available on the chip? Also, after your engage did you try to re-tune the frequency to see if there were any shifts?
I always use the a-lever which has a spring constant 0.35N/m, does the c-lever work better?
I do the surface tune, however it does not improve much.
Wang Shuo
Yes, the c-lever works much better for fluid tapping. Please try the c-lever and let us know the outcome.
With kind regards,