Metals have been increasingly used as substrates in devices based on two-dimensional (2D) materials. However, the high reflectivity of bulk metals results in low optical contrast (<3%) and therefore poor visibility of transparent mono- and few-layer 2D materials on these surfaces. Here we demonstrate that by engineering the complex reflectivity of a purpose-designed multilayer heterostructure composed of thin Au films (2-8 nm) on SiO2/Si substrate, the optical contrast of graphene and graphene oxide (GO) can be significantly enhanced in comparison to bulk Au, up to about 3 and 5 times, respectively. In particular, we achieved ∼17% optical contrast for monolayer GO, which is even 2 times higher than that on bare SiO2/Si substrate. The experimental results are in good agreement with theoretical simulations. This concept is demonstrated for Au, but the methodology is applicable to other metals and can be adopted to design a variety of high-contrast metallic substrates. This will facilitate research and applications of 2D materials in areas such as plasmonics, photonics, catalysis and sensors.
FingerprintDive into the research topics of 'Optimising the visibility of graphene and graphene oxide on gold with multilayer heterostructures'. Together they form a unique fingerprint.
MoS2 on Gold: Achieving extremely high exfoliation yield and optical contrast for Van der Waals monolayersAuthor: Donnelly, G., Dec 2020
Student thesis: Doctoral Thesis › Doctor of PhilosophyFile
Supervisor: Huang, F. (Supervisor)
Student thesis: Doctoral Thesis › Doctor of Philosophy