FeCl3 based Few-Layer Graphene Intercalation Compounds: Single Linear Dispersion Electronic Band Structure and Strong Charge Transfer Doping

TL;DR

This paper demonstrates that FeCl3 intercalation in few-layer graphene effectively modifies its electronic properties, producing a single-layer-like band structure with strong charge transfer doping, opening new avenues for applications.

Contribution

It introduces a full intercalation method for graphene, revealing a single linear dispersion band structure and strong doping effects in FLGIC, which was not previously reported.

Findings

Successful fabrication of FeCl3 intercalated FLG with full intercalation.

FLGIC exhibits a single Lorentzian 2D peak similar to single-layer graphene.

Band structure of FLGIC resembles single-layer graphene with strong doping.

Abstract

Graphene has attracted great attentions since its first discovery in 2004. Various approaches have been proposed to control its physical and electronic properties. Here, we report that graphene based intercalation compounds is an efficient method to modify the electronic properties of few layer graphene (FLG). FeCl3 intercalated FLG were successfully prepared by two-zone vapor transport method. This is the first report on full intercalation for graphene samples. The features of the Raman G peak of such few-layer graphene intercalation compounds (FLGIC) are in good agreement with their full intercalation structures. The FLGIC presents single Lorentzian 2D peak, similar to that of single layer graphene, indicating the loss of electronic coupling between adjacent graphene layers. First principle calculations further reveal that the band structure of FLGIC is similar to single layer graphene but with strong doping effect due to the charge transfer from graphene to FeCl3. The successful fabrication of FLGIC opens a new way to modify properties of FLG for fundamental studies and future applications.