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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Tunable Doping in Graphene by Light-Switchable Molecules.

H B Mihiri Shashikala¹, Chantel I Nicolas, Xiao-Qian Wang

¹Department of Physics, Clark Atlanta University, Atlanta, Georgia 30314, United States.

The Journal of Physical Chemistry. C, Nanomaterials and Interfaces

|January 15, 2013

Summary

This summary is machine-generated.

Light-switchable molecules reversibly tune graphene doping by altering their dipole moment through cis-trans isomerization. This charge transfer mechanism offers new ways to control graphene

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Area of Science:

Materials Science
Condensed Matter Physics
Physical Chemistry

Background:

Noncovalent functionalization is a key strategy for tuning graphene's electronic properties.
Recent experiments show reversible doping in graphene-chromophore hybrids.

Purpose of the Study:

Investigate the electronic structure of chromophore/graphene hybrids.
Elucidate the mechanism behind reversible graphene doping via isomerization.

Main Methods:

Dispersion-corrected density functional theory calculations.
Analysis of electronic structure and charge transfer.

Main Results:

Cis-trans isomerization of chromophores shifts graphene's Dirac point.
Reversible doping is driven by changes in chromophore dipole moment and charge transfer.
External electric fields can further tailor graphene doping.

Conclusions:

The study confirms the mechanism of reversible graphene doping through light-induced chromophore isomerization.
This work provides insights for designing advanced graphene-based electronic devices.
External electric fields offer an additional control parameter for graphene functionalization.