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Electric Techniques
Electric Techniques Overview
274 Dimension 3100 Manual Rev. D
Figure 16.1b Extender Electronics Module
If applying a voltage to the tip is desired, then the special electric cantilever holder is required
(model MMEFCH).
16.1.2 Surface Potential Imaging Overview
Surface potential imaging measures the effective surface voltage of the sample by adjusting the
voltage on the tip so that it feels a minimum electric force from the sample. (In this state, the
voltage on the tip and sample is the same.) Samples for surface potential measurements should have
an equivalent surface voltage of less than ±10V, and operation is easiest for voltage ranges of ±5V.
The noise level of this technique is typically 10mV. Samples may consist of conducting and
nonconducting regions, but the conducting regions should not be passivated. Samples with regions
of different materials will also show contrast due to contact potential differences. Quantitative
voltage measurements can be made of the relative voltages within a single image. This method
requires the Extender Electronics Module and version 3.1 or later of the NanoScope software.
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