Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 2: Interfaces and Thin Films I (joint session with DECHEMA and VDI)

CPP 2.10: Vortrag

Montag, 11. März 2013, 12:15–12:30, H40

Imaging of carbon nanomembranes and graphene with helium-ion microscopy — •André Beyer, Henning Vieker, Annika Willunat, Nils-Eike Weber, Matthias Büenfeld, Andreas Winter, Xianghui Zhang, Min Ai, Andrey Turchanin, and Armin Gölzhäuser — Physics of Supramolecular Systems, University of Bielefeld, 33615 Bielefeld, Germany

We present a helium-ion microscopy (HIM) study of carbon nanomembranes (CNMs) and graphene. CNMs are extremely thin (∼1 nm) nanolayers consisting only of surface-near atoms. They are made via cross-linking of self-assembled monolayers (SAMs) with large-area exposures of electrons, photons or helium ions and subsequent transfer to suitable substrates. In this contribution we demonstrate that imaging of CNMs with HIM is an effective way of their characterization due to the high surface sensitivity of HIM. Patterned radiation exposures allow the fabrication of perforated nanomembranes, e.g. nanosieves. Another way of generating nanopores in homogeneous CNMs is to irradiate them with slow highly charged ions. Imaging such perforated CNMs with HIM yields high signal-to-noise ratios as well as low sample damage. Annealing of CNMs at high temperatures in vacuum transforms them into graphene. HIM images of graphene from SAMs are compared with CVD grown graphene. Capabilities of HIM imaging of freestanding CNMs and graphene will be discussed.