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

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Gap openings in graphene regarding interfacial interaction from substrates.

Y F Zhu¹, Q Q Dai, W T Zheng

¹Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun, 130022, China. jiangq@jlu.edu.cn.

Physical Chemistry Chemical Physics : PCCP

|February 12, 2014

Summary

This summary is machine-generated.

We investigated how substrate interactions affect graphene band gaps. Chemical bonding significantly opens the gap by altering graphene's cohesive energy, unlike weaker van der Waals forces. This is key for graphene electronics applications.

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Area of Science:

Materials Science
Condensed Matter Physics
Surface Science

Background:

Graphene's unique electronic properties are highly sensitive to its environment.
Understanding substrate interactions is crucial for tailoring graphene's band gap for electronic applications.

Purpose of the Study:

To investigate the impact of different interfacial interactions on band gap opening in graphene layers.
To differentiate the effects of van der Waals forces versus chemical bonding on graphene's electronic structure.

Main Methods:

Utilized a size-dependent cohesive energy formula for two-dimensional materials.
Analyzed changes in atomic cohesive energy due to substrate-induced coordination imperfections.

Main Results:

Weak van der Waals interactions induce minimal gap opening in graphene.
Stronger chemical bonding readily opens the band gap due to substantial changes in graphene's cohesive energy.
Predictions align with experimental and simulation data for graphene on Boron Nitride (BN) and Silicon Carbide (SiC).

Conclusions:

The nature of the substrate-graphene interface dictates the extent of band gap opening.
Chemical bonding-induced changes in cohesive energy are the primary mechanism for significant gap modification.
Findings provide valuable insights for the design and application of graphene-based electronic devices.