A1 Refereed original research article in a scientific journal

Polarized Tips or Surfaces: Consequences in Kelvin Probe Force Microscopy




AuthorsHynninen T, Foster AS, Barth C

PublisherSURFACE SCI SOC JAPAN

Publication year2011

Journale-Journal of Surface Science and Nanotechnology

Journal name in sourceE-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY

Journal acronymE-J SURF SCI NANOTEC

Volume9

First page 6

Last page14

Number of pages9

ISSN1348-0391

DOIhttps://doi.org/10.1380/ejssnt.2011.6


Abstract
In this work, we present non-contact atomic force microscopy (nc-AFM) and Kelvin probe force microscopy(KPFM) simulations of the (001) surface of silver and supported MgO thin films. From the calculated forcespectroscopy, we predict atomic resolution at tip-surface distances of less than 5 angstrom. For KPFM, we study the influence of charges localized on either the tip or on the surface on the Kelvin voltage. It is shown that the Kelvinvoltage changes when the tip is placed above an MgO monolayer, only if the layer has a permanent net dipole. Forpoint charges on the silver surface we examine the lateral resolution in the distance range of 1 to 3 nm, which isthe standard working distance in KPFM. We show that point charges appear as nanometer large spots in Kelvinimages, which is due to a long-range electrostatic interaction with the tip apex.



Last updated on 2024-26-11 at 17:59