We present a method of measuring the charge density on dielectric surfaces. Similar to electrostatic force microscopy we record the electrostatic interaction between the probe and the sample surface, but at large tip-sample distances. For calibration we use a pyroelectric sample which allows us to alter the surface charge density by a known amount via a controlled temperature change. For proof of principle we determined the surface charge density under ambient conditions of ferroelectric lithium niobate.
@article{arxiv.1009.1902,
title = {Quantitative measurement of the surface charge density},
author = {Florian Johann and Elisabeth Soergel},
journal= {arXiv preprint arXiv:1009.1902},
year = {2015}
}