Drastic Minimization in the van der Waals Interaction with the Bottom Epitaxial Graphene Layer by the Diels-Alder Surface Chemistry of the Top Graphene Layer

TL;DR

This paper demonstrates that Diels-Alder surface chemistry on top epitaxial graphene significantly reduces van der Waals interactions with the underlying layer, enabling near-pristine graphene surfaces crucial for electronic device fabrication.

Contribution

It introduces a novel surface chemistry approach that drastically minimizes interlayer van der Waals forces in stacked graphene, advancing covalent modification techniques for electronics.

Findings

Significant reduction in van der Waals interactions after Diels-Alder modification.

The top graphene layer can be detached, leaving the underlying layer nearly pristine.

Addresses key surface chemistry questions relevant for device fabrication.

Abstract

The Diels-Alder surface modified top epitaxial graphene layer, with newly created pair of sp3 carbon centres, results in abrupt minimization of interlayer van der Waals interactions between two stacked graphene planes, and escapes the wafer during post-reaction manipulation stage, leaving the layer under it almost pristine-like. Above picture shows Diels-Alder functionalized sp2/sp3 graphene adduct leaves the parent wafer. In this communication we systematically address several fundamental questions in graphene surface chemistry, which are of extreme importance for device fabrication, and in successful implementation of covalently modified graphene in electronics industry.