title: Electrical properties of bilayer graphene synthesized using surface wave microwave plasma techniques at low temperature.
abstract: Bilayer graphene was synthesized at low temperature using surface wave microwave plasma techniques where poly(methyl metacrylate) (PMMA) and methane (CH4) were used as carbon sources. Temperature-dependent Hall effect measurements were carried out in a helium atmosphere. Sheet resistance, sheet carrier density and mobility showed weak temperature dependence for graphene from PMMA, and the highest carrier mobility is 740 cm2V-1s-1. For graphene from CH4, tunneling of the domain boundary limited carrier transport. The difference in average domain size was determined by Raman signal maps. In addition, residuals of PMMA were detected on graphene from PMMA. The low sheet resistances of graphene synthesized at a temperature of 280 °C using plasma techniques were explained by the PMMA related residuals rather than the domain sizes.
authors.affiliation: Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, 305-8565, Japan.
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Yamada
authors.forename: Hiromitsu
authors.initials: H
authors.lastname: Kato
authors.forename: Yuki
authors.initials: Y
authors.lastname: Okigawa
authors.forename: Masatou
authors.initials: M
authors.lastname: Ishihara
authors.forename: Masataka
authors.initials: M
authors.lastname: Hasegawa