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Ultra-thin NaCl films as protective layers for graphene
Irene Palacio1, Koen Lauwaet, Luis Vázquez
1Materials Science Factory, Dept. Surfaces, Coatings and Molecular Astrophysics, Institute of Material Science of Madrid (ICMM-CSIC), C/Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain. i.palacio@csic.es gago@icmm.csci.es.
Nanoscale
|July 20, 2019
Summary
Ultra-thin sodium chloride (NaCl) films protect graphene from ageing and oxidation. This easily-removable capping layer preserves graphene"s integrity for technological applications.
Area of Science:
- Materials Science
- Surface Science
- Nanotechnology
Background:
- Graphene
- aging is a significant challenge hindering its widespread technological adoption.
- Protective capping layers offer a viable solution to mitigate graphene degradation.
Purpose of the Study:
- To investigate the efficacy of ultra-thin sodium chloride (NaCl) films as easily-removable protective layers for graphene.
- To characterize the NaCl/graphene interface on metal substrates (Cu(111) and Ir(111)).
Main Methods:
- Utilized complementary microscopy techniques.
- Employed electron diffraction analysis.
- Conducted spectroscopic characterizations.
Main Results:
- Demonstrated that NaCl does not chemically interact with or intercalate through graphene.
- Confirmed the stability of the NaCl film under ambient conditions.
- Showcased effective protection of the graphene surface from oxidation by the NaCl layer.
Conclusions:
- Ultra-thin NaCl films serve as effective, non-interacting capping layers for graphene.
- The NaCl protective layer can be easily removed, leaving graphene intact.
- This method offers a promising strategy for preserving graphene quality in technological applications.
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