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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
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Tunable Anderson localization in hydrogenated graphene based on the electric field effect
1National Renewable Energy Laboratory, Golden, Colorado 80401, USA.
Physical Review Letters
|December 10, 2013
Summary
Researchers developed a new method to control hydrogen density on graphene using ammonia gas and electric fields. This breakthrough allows for reversible tuning of hydrogen levels, crucial for advanced graphene electronics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Surface Science
Background:
- Controlling hydrogenation on graphene is vital for its applications.
- Reversible control of hydrogen density (n(H)) is challenging due to irreversible H2 formation.
Purpose of the Study:
- To present a novel mechanism for reversible control of n(H) on graphene.
- To investigate the use of electric fields to tune this process.
Main Methods:
- Utilizing first-principles calculations.
- Simulating proton transfer reactions between ammonia (NH3) gas and hydrogenated graphene.
- Analyzing the effect of perpendicular electric fields.
Main Results:
- Demonstrated reversible tuning of n(H) via applied electric fields.
- Showed that n(H) can be controlled around the critical density for Anderson localization.
- Identified field-induced hydrogen adsorption and desorption on graphene.
Conclusions:
- The proposed mechanism offers a novel pathway for controlling n(H) on graphene.
- Field-induced control of hydrogen adsorption/desorption is feasible.
- This opens possibilities for new graphene transistors utilizing tunable disorder.
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