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Hydrogenated-Graphene-Encapsulated Graphene: A Versatile Material for Device Applications
Mohammed Ghadiyali1, Sajeev Chacko1
1Department of Physics, University of Mumbai, Kalina Campus, Santacruz (E), Mumbai 400 098, India.
ACS Omega
|October 29, 2019
Summary
We propose a hydrogenated-graphene-sandwiched graphene heterostructure that preserves electronic states for quantum spin Hall effect (QSHE) applications. This versatile material also shows potential for sensor devices and magnetism-based applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene heterostructures are investigated for quantum spin Hall effect (QSHE) and magnetism-based devices.
- Preserving graphene's electronic properties, like the Dirac cone, is crucial for QSHE applications.
- Substrate interactions can degrade graphene's electronic states, hindering device performance.
Purpose of the Study:
- To explore a novel graphene heterostructure using hydrogenated graphene encapsulation.
- To assess the material's suitability for QSHE, magnetism-based devices, and molecular sensing.
- To confirm the preservation of graphene's electronic states within the heterostructure.
Main Methods:
- Density Functional Theory (DFT) calculations were performed.
- The electronic states of multilayer graphene sandwiched by hydrogenated graphene were analyzed.
- The stability of graphene states under electric fields and substrate interactions was investigated.
Main Results:
- Graphene's Dirac cone, essential for QSHE, is preserved when encapsulated by hydrogenated graphene.
- Electronic states of graphene and hydrogenated graphene showed minimal interference.
- Graphene states remained stable under electric fields up to ±2.5 V/nm and were protected from substrate interactions.
- Magnetization can be induced with minimal impact on graphene's electronic states.
- The heterostructure demonstrated potential for molecular detection.
Conclusions:
- Multilayer graphene encapsulated by hydrogenated graphene is a versatile material.
- The proposed heterostructure is suitable for QSHE and sensor devices.
- Hydrogenated graphene encapsulation effectively protects graphene's electronic properties for advanced applications.
