| AVS 61st International Symposium & Exhibition | |
| 2D Materials Focus Topic | Thursday Sessions |
| Session 2D+AS+HI+NS+SS-ThM |
| Session: | Nanostructures including 2D Heterostructures, Patterning of 2D Materials |
| Presenter: | Andreas Winter, University of Bielefeld, Germany |
| Authors: | A. Winter, University of Bielefeld, Germany M. Woszczyna, Physikalisch-Technische Bundesanstalt, Germany R. Stosch, Physikalisch-Technische Bundesanstalt, Germany T. Weimann, Physikalisch-Technische Bundesanstalt, Germany F. Ahrelrs, Physikalisch-Technische Bundesanstalt, Germany A. Turchanin, University of Bielefeld, Germany |
| Correspondent: | Click to Email |
Heterostructures of graphene with other 2D materials are of great interest for nanoscience and nanotechnology. However, their fabrication is still not a trivial task. Here we present the engineering and characterization of (i) vertical and (ii) lateral heterostructures of molecular thin (~1 nm) dielectric carbon nanomembranes (CNMs) made of aromatic molecules [1] and single-layer (SLG) graphene sheets. (i) The vertical CNM/SLG heterostructures with terminal amino-groups (NH2-) are assembled via the mechanical transfer onto oxidized silicon wafers. We show by complementary spectroscopy and microscopy techniques as well as by electric transport measurements that functional amino groups are brought into close vicinity of the SLG sheets and that electric transport of the SLG is not impaired by this assembly, leading to the non-destructive chemical functionalization of graphene [2]. (ii) The lateral heterostructures are engineered using electron-irradiation-induced crosslinking of SLG sheets with CNMs. We demonstrate reliable production of well-defined laterally patterned CNM-SLG heterostructures of various sized and architectures on solid substrates and as free-standing sheets, and characterize their properties by Raman spectroscopy and helium ion microscopy.
[1] A. Turchanin and A. Gölzhäuser, Carbon nanomembranes from self-assembled monolayers: Functional surfaces without bulk. Prog. Surf. Sci. 87, 108-162 (2012)
[2] M. Woszczyna et al., All-carbon vertical van der Waals heterostructures: Non-destructive functionalization of graphene for electronic applications. Adv. Mater. 26 (2014) DOI: 10.1002/adma.201400948