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I would start by getting some high quality topographic images of your sample to identify areas taht are relatively flat and the length scale of those areas. If the contact area of tip on sample is small compared to the relatively flat area, you should be able to get decent modulus numbers from either PF-QNM or point and shoot force curves (really the
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Dear Alessandro, As you have noted, we do not currently support plotting against Z sensor in Force Volume. That is because the Z sensor needs to be acquired as a separate data channel and we only support collecting a single data channel in FV (not including calculated channels like modulus and adhesion). You can get results similar to those available
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please see the response in your other thread: http://nanoscaleworld.bruker-axs.com/nanoscaleworld/forums/t/1445.aspx
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Dear Mariam, How stiff (ballpark) is your ceramic sample? When you say the roughness is 0.5-2um what is the scan size that gives you that roughness? If you want to measure the modulus of a stiff sample, you must use a stiff cantilever. Question 1 will allow you to look in the manual and find the recommended probe. However, even with the recommended
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You should choose a cantilever that is sensitive as possible, but does not cause the deflection measurement to saturate or become non-linear. The force is the spring constant times the deflection sensitivity times the detector voltage (F=K*Sd*V). If we know K for a given probe type and we know the approximate Sd (this depends on probe type, head, microscope
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What do you mean by "Same kind of bad results though there was no negative aspect to the curve."? I thought your issue was the backwards slope of the contact part of the curve. What was the ramp rate of the ramp you provided? The ramp rate during calibration? I don't think water alone is the issue -- my feeling is that the tip would go
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oops, now I see you have a Multimode. That answers 1 &2...
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Which system are you using? Are both the height and the height sensor calibrated correctly? Could it be that you are using one for doing the calibration and the other for the measurements on PS? Any chance you might have moved the laser position or photodiode position after calibration? If you do the calibration, save a curve, and plot it this way do
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Excellent! Now I see what you are saying. Which microscope are you using? Multimode, Dimension, Catalyst? Are you using CLZ? If so, I'm thinking that the feedback is not keeping up with the Z motion. I would suggest switching to open loop, but collecting the Z sensor as a separate channel so that you can use that in the separation calculation. Another
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Can you repost your images? They are not showing up, making it difficult to understand the "weird behavior" --Bede