Article ID Journal Published Year Pages File Type
725657 Journal of Electrostatics 2010 6 Pages PDF
Abstract

A numerical model capable of estimating the surface charge density(σS) and the dielectric constant(ke) of a hemispherical sample from force gradient measurements is proposed. Force gradients are commonly detected by a biased conductive tip during electrostatic force microscopy(EFM) probing but provide limited quantitative assessment of the charge in the sample. The proposed model gives an analytical solution for the force exerted over a biased conical tip. Theoretical numerical results, presented in the form of multitraces of minimum force gradients for fixed bias voltages and tip-sample distances allow the translation of EFM force gradient measurements into functions of σS and ke.

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Physical Sciences and Engineering Engineering Electrical and Electronic Engineering
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