<div class="csl-bib-body">
<div class="csl-entry">Balajka, J. (2025, May 15). <i>Decoding insulating oxide surfaces with noncontact AFM</i> [Presentation]. Condensed Matter Physics Forum – Peking University, Beijing, China.</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/216018
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dc.description.abstract
Oxides and minerals are often electrically insulating and thus out of reach for many experimental techniques. Despite its direct impact on surface chemistry, the detailed surface structure of many of these materials has not been conclusively determined. Recent advances in noncontact atomic force microscopy (nc-AFM) have revolutionized imaging of surfaces including those of insulators. [1]. Moreover, a suitably terminated tip apex can reveal the chemical identity of individual surface atoms.
In recent work, we employed oxygen-terminated CuOx tips [2] to solve a complex surface reconstruction of a notorious insulator – corundum Al2O3 [3]. At close proximity, the oxygen atom on the tip is repelled by oxygen atoms on the surface and attracted to aluminum atoms of the Al2O3 surface. Mapping this local repulsion and attraction allows us to directly determine the distribution of atoms within the reconstructed surface. The atomically resolved images directly show that the reconstructed Al2O3(0001) surface retains stoichiometric composition, disproving the previously hypothesized metallic Al termination.
en
dc.language.iso
en
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dc.subject
surface science
en
dc.subject
atomic structure
en
dc.subject
insulators
en
dc.subject
alumina
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dc.title
Decoding insulating oxide surfaces with noncontact AFM
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.type.category
Presentation
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tuw.publication.invited
invited
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tuw.researchTopic.id
M1
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tuw.researchTopic.name
Surfaces and Interfaces
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tuw.researchTopic.value
100
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tuw.publication.orgunit
E134-05 - Forschungsbereich Surface Physics
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tuw.author.orcid
0000-0001-7101-1055
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tuw.event.name
Condensed Matter Physics Forum – Peking University
