title: Creating Reversible p-n Junction on Graphene through Ferritin Adsorption.
abstract: An alternative way to construct a stable p-n junction on graphene-based field effect transistor (G-FET) through physical adsorption of ferritin (spherical protein shell) is presented. The produced p-n junction on G-FET could also operate through water-gate. Native ferritins are known to be negatively charged in wet condition; however, we found that native negatively charged ferritins became positively charged after performing electron beam (EB)-irradiation. We utilized this property to construct p-n junction on G-FET. We found also that EB-irradiation could remove the effect of charged impurity adsorbed on graphene layer, thus the Dirac point was adjusted to gate voltage Vg = 0.
authors.affiliation: Nara Institute of Science and Technology, Graduate School of Materials Science , 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
authors.forename: Yana
authors.initials: Y
authors.lastname: Mulyana
authors.affiliation: Nara Institute of Science and Technology, Graduate School of Materials Science , 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
authors.forename: Mutsunori
authors.initials: M
authors.lastname: Uenuma
authors.affiliation: Nara Institute of Science and Technology, Graduate School of Materials Science , 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
authors.forename: Naofumi
authors.initials: N
authors.lastname: Okamoto
authors.affiliation: Nara Institute of Science and Technology, Graduate School of Materials Science , 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
authors.forename: Yasuaki
authors.initials: Y
authors.lastname: Ishikawa
authors.affiliation: Nara Institute of Science and Technology, Graduate School of Materials Science , 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Yamashita
authors.affiliation: Nara Institute of Science and Technology, Graduate School of Materials Science , 8916-5 Takayama, Ikoma, Nara 630-0192, Japan.
authors.forename: Yukiharu
authors.initials: Y
authors.lastname: Uraoka
mesh_terms: D005293:Ferritins / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*
chemical_list: D006108:Graphite; D005293:Ferritins
keywords: electron-beam irradiation; ferritin; graphene; protein; p−n junction