Yesterday I found one method that worked.
The left-right scan image lines bared no resemblance and the roughness was in orders of tenths of nanometers.
At the time I was observing at 0.7 nA and 1.8 V. I increased the voltage to 3.00 V and the current to 2.0 nA. After scanning for sometime...
Yes, I`ve tried that a few times, but it did not work.
I suspect that it has something to do with sample preparations, because samples prepared in ultra high vacuum by evaporation seem to exhibit nice images with roughness less than 10 pm.
My samples are carbon nanotubes, thus they cannot be...
When the STM becomes unstable(large variations in the current), what procedures should I take in order to fix it?
I am new to the STM, but after a few month`s experience I notice that one of the main problems is stabilizing it.
When the tunneling current becomes unstable, I`ve tried to...