Distinguish between stm and afm imaging modes based on the


Scanning Probe Microscopy

1. Distinguish between STM and AFM imaging modes based on the input signal to the feedback loop and the type of signals recorded.

2. Explain the origin and nature of the dependence of current on gap distance in an STM.

3. Describe the relative motion of an AFM tip and sample when scanning a square area in contact mode and tapping mode.

4. Why might STM be used to determine the usefulness of a carbon nanotube for inclusion in a field effect transistor?

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