Force distance measurement of hard samples in Contact Mode on Catalyst

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replied on Mon, Mar 12 2012 3:43 PM

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Hi,

Did you check the manual? It would be very helpful for us to know what is not clear in the manual so it can be improved upon in a later version.

Thanks,

Stefan

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Tejasvi Parupudi replied on Mon, Mar 12 2012 3:59 PM

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I have found the Force Spectroscopy Chapter in the Catalyst Experiment Guide but the method in there is for soft samples. I want to do a force-distance curve in contact mode in air on Silicon; so was hoping to find a application note or support note that details this procedure. 

Thanks,

Tejasvi

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Tejasvi Parupudi replied on Mon, Mar 12 2012 4:42 PM

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I was able to do it.

Thanks Stefan.

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replied on Mon, Mar 12 2012 4:48 PM

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No worries. Good luck with your experiments.

Stefan

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Luis replied on Mon, Aug 13 2012 2:54 PM

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Hi Tejasvi, I have also done force-distance curves in contact mode in air on Silicon. I'm new in the subject and it would be nice if you could take a look at my results to check if they are similar to yours. In the graph below I show the mentioned force-distance curves for three different tips, where the slopes of the linear curves are shown in the labels. Which tip have you used?

A few issues:

(a) I was surprised to obtain quite similar results for the sensitivity irrespective of the tip used.

(b) While approaching I would have though that the softer cantilevers (smaller spring constant) would have had a larger step when reaching the surface; however I observe the opposite.

(c) I do not understand the slow release effect that show the Antimony (n) doped Si tips when retracting.

If anyone else would like to comment I would also appreciate it,

Thanks in advance!

Luis