Atom-resolved analysis of an ionic KBr(001) crystal surface covered with a thin water layer by frequency modulation atomic force microscopy

Langmuir : the ACS Journal of Surfaces and Colloids
Toyoko AraiNoriaki Oyabu

Abstract

An ionic KBr(001) crystal surface covered with a thin water layer was observed with a frequency modulation atomic force microscope (FM-AFM) with atomic resolution. By immersing only the tip apex of the AFM cantilever in the thin water layer, the Q-factor of the cantilever in probing the solid-liquid interface can be maintained as high as that of FM-AFM operation in air, leading to improvement of the minimum detection of a differential force determined by the noise. Two types of images with atom-resolved contrast were observed, possibly owing to the different types of ions (K(+) or Br(-)) adsorbed on the tip apex that incorporated into the hydration layers on the tip and on the sample surface. The force-distance characteristics at the solid-water interface were analyzed by taking spatial variation maps of the resonant frequency shift of the AFM cantilever with the high Q-factor. The oscillatory frequency shift-distance curves exhibited atomic site dependence. The roles of hydration and the ions on the tip and on the sample surface in the measurements were discussed.

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Citations

Jul 16, 2016·Nature Communications·Daniel Martin-JimenezRicardo Garcia
Jun 24, 2016·Beilstein Journal of Nanotechnology·Hannes BeyerAndreas Stemmer
Oct 2, 2017·The Journal of Chemical Physics·Taketoshi MinatoZempachi Ogumi
Feb 26, 2020·ACS Omega·Yuya TedukaHiroshi Onishi

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