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Tunable Bandgap in Graphene by the Controlled Adsorption of Water Molecules
Author(s) -
Yavari Fazel,
Kritzinger Christo,
Gaire Churamani,
Song Li,
Gulapalli Hemtej,
BorcaTasciuc Theodorian,
Ajayan Pulickel M.,
Koratkar Nikhil
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201001384
Subject(s) - graphene , band gap , materials science , adsorption , molecule , nanophotonics , nanotechnology , optoelectronics , chemistry , organic chemistry
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.