Abstract
Owing to its array of unique properties, graphene is a promising material for a wide variety of applications. Being two-dimensional, the properties of graphene are also easily tuned via proximity to other materials. In this work, we investigate the possibility of inducing electrical and optical anisotropy in graphene by interfacing it with other anisotropic carbon systems, including nanoporous graphene and arrays of graphene nanoribbons. We find that such materials do indeed induce such anisotropy in graphene while also preserving the unique properties offered by graphene’s Dirac band structure, namely, its superior charge transport and long-wavelength optical absorption. The optical anisotropy makes such heterostructures interesting for their use in applications related to long-wavelength polarimetry, while the electrical anisotropy may be valuable for enhancing the performance of graphene photothermoelectric detectors.
Highlights
Superlattices with periodicity ≈1 nm have been realized in graphene
We explore the possibility of tuning the properties of graphene by interfacing it with nanoporous graphene (NPG) or arrays of graphene nanoribbons (GNRs)
We show that NPG and GNRs can induce anisotropy in graphene, both in its optical absorption and in its electrical transport
Summary
Superlattices with periodicity ≈1 nm have been realized in graphene. By using directed reactions among self-organized molecular precursors, it is possible to fabricate graphene containing a periodic array of nanoscale holes.17 Called nanoporous graphene (NPG), this material has a large bandgap and is expected to exhibit anisotropic optical and electrical properties, making it intriguing for devices. We explore the possibility of tuning the properties of graphene by interfacing it with NPG or arrays of GNRs. The goal is to combine one of the interesting properties of these materials, namely, their anisotropy, with the unique properties offered by graphene’s Dirac band structure, namely, its superior charge scitation.org/journal/adv transport and long-wavelength optical absorption, into mid-IR and beyond.
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