Interface effects on titanium growth on graphene

Autor(en)

Georg Zagler, Alberto Trentino, Kimmo Mustonen, Clemens Mangler, Jani Kotakoski

Abstrakt

Poor quality interfaces between metal and graphene cause non-linearity and impair the carrier mobility in graphene devices. Here, we use aberration corrected scanning transmission electron microscopy to observe hexagonally close-packed Ti nano-islands grown on atomically clean graphene, and establish a 30

^∘ epitaxial relationship between the lattices. Due to the strong binding of Ti on graphene, at the limit of a monolayer, the Ti lattice constant is mediated by the graphene epitaxy, and compared to bulk Ti, is strained by ca. 3.7% to a value of 0.306(3) nm. The resulting interfacial strain is slightly greater than what has been predicted by density functional theory calculations. Our early growth stage investigations also reveal that, in contrast to widespread assumptions, Ti does not fully wet graphene but grows initially in islands with a thickness of 1-2 layers. Raman spectroscopy implies charge transfer between the Ti islands and graphene substrate.

Organisation(en)

Physik Nanostrukturierter Materialien

Journal

2D Materials

Band

10

Anzahl der Seiten

8

ISSN

2053-1583

Publikationsdatum

04-2022

Peer-reviewed

Ja

ÖFOS 2012

103008 Experimentalphysik, 103009 Festkörperphysik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering, Allgemeine Chemie, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/463197a2-3698-44b5-85bb-08d47c8a9bc5