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Problems regarding the TappingMode in liquid

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王硕 posted on Sat, Mar 9 2013 3:34 AM

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.

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replied on Mon, Mar 25 2013 12:11 PM

Hi Wang Shuo,

What frequency do you use to excite your tips in fluids?

Regards,

Stefan

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王硕 replied on Mon, Mar 25 2013 9:23 PM

I select the resonance peak  in the range 7-9 kHz

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replied on Thu, Mar 28 2013 11:52 AM

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?

Regards,

Stefan

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Top 75 Contributor
15 Posts
Points 167
王硕 replied on Thu, Mar 28 2013 11:05 PM

Hi,

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.

Regards,

Wang Shuo

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replied on Fri, Mar 29 2013 5:10 PM

Hi 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,

Stefan

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