Site‐Specific Chemical Surface Functionalization and Electronic Patterning of Graphene by Electrooxidative Lithography

Abstract

The combination of different properties being manipulated on nanomaterials is one of the challenges in nanotechnology research. In particular, the possibility to tailor the electronic and chemical properties offers promising possibilities for the design of functional nanostructures. Herein, we report an approach that permits control of these properties on the basis of electrooxidative lithography to structure reduced graphene oxide functionalized with a self-assembled monolayer of n-octadecyltrichlorosilane. The electrochemical oxidation process first induces the formation of polar acid groups on the monolayer, which can be used to covalently bind nanoparticles and molecules and, secondly, also allows the reoxidation of the underlying reduced graphene oxide. As such, the chemical signature as well as the electronic properties of the substrate can be tailored on the micro- and nanometer scale. Details on the oxidation of the monolayer as well as thorough characterization of the electronic properties will be presented. Finally, the approach is used to demonstrate the fabrication of a sensitive glucose sensor device.

Photoluminescent Arrays of Nanopatterned Monolayer MoS2

“…Patterning of 2D materials is often achieved using resist‐based electron‐beam and optical lithography methods, direct patterning by focused ion beams (Ga and He), energetically preferred chemical etching, nanoprobe cutting and block copolymer (BCP) lithography . Block copolymers, which consist of two or more incompatible blocks, microphase separate below their order–disorder temperature into periodic arrays of microdomains such as spheres, cylinders, or lamellae .…”