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Tunable Bandgap in Graphene by the Controlled Adsorption of Water Molecules

2010; Wiley; Volume: 6; Issue: 22 Linguagem: Inglês

10.1002/smll.201001384

1613-6829

Fazel Yavari, C. C. Kritzinger, C. Gaire, Li Song, Hemtej Gulapalli, Theodorian Borca‐Tasciuc, Pulickel M. Ajayan, Nikhil Koratkar,

Metamaterials and Metasurfaces Applications

Lack of a bandgap limits the utilization of graphene in nanoelectronic and nanophotonic devices. It is shown that a tunable bandgap of up to ≈0.2 eV can be engineered by controlled adsorption of water molecules to a graphene surface. The effect is reversible, and the energy gap reduces to ≈0.029 eV as the humidity is brought down to zero.