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TT: Fachverband Tiefe Temperaturen

TT 58: Graphene I: Growth, Structure and Substrate Interaction (joint session O/TT)

TT 58.5: Vortrag

Donnerstag, 19. März 2020, 11:30–11:45, GER 37

Controlled formation of nanobubbles in graphene — •Pin-Cheng Lin¹, Renan Villarreal¹, Harsh Bana¹, Ken Verguts^2,3, Steven Brems³, Stephen de Gendt^2,3, Manuel Auge⁴, Felix Junge⁴, Hans Hofsäss⁴, Hossein Ghorbanfekr⁵, M Fallh⁵, François Peeters⁵, Mehdi Neek-Amal⁵, Chris Van Haesendonck¹, and Lino da Costa Pereira¹ — ¹Quantum Solid State Physics, KU Leuven, 3001 Leuven, Belgium — ²Departement Chemie, KU Leuven, 3001 Leuven, Belgium — ³imec, 3001 Leuven, Belgium — ⁴II. Institute of Physics, University of Göttingen, Göttingen 37077, Germany — ⁵Department of Physics, University of Antwerp, 2020 Antwerp, Belgium

Strained nanobubbles have been used to engineer the electronic structure of graphene through the creation of pseudomagnetic fields (e.g. via strain imposed by a selected substrate or mechanical actuators), however, they provide limited controllability. Here we report on the controlled formation of noble gas (He, Ne, Ar) nanobubbles in graphene (on various substrates) using ultra-low energy (ULE) ion implantation. ULE ion implantation allows us to precisely tune the number of implanted ions and their kinetic energy, which in turn controls the bubble formation efficiency and bubble density. Our experimental approach is based on scanning tunneling microscopy/spectroscopy (STM/STS), synchrotron X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, among others, complemented by density functional theory (DFT) and molecular dynamics calculations (MD), which give insight into the bubble formation and stability mechanisms.