[15p-A33-1~19] 17.2 Graphene

△ [15p-A33-9] Control of Acoustic Current in Solution by Graphene Surface Acoustic Wave Device

〇Satoshi Okuda^1,2, Yasushi Kanai¹, Takao Ono¹, Takashi Ikuta¹, Shinpei Ogawa², Daisuke Fujisawa², Masaaki Shimatani², Koichi Inoue¹, Kenzo Maehashi^1,3, Kazuhiko Matsumoto¹ (1.ISIR, Osaka Univ., 2.Mitsubishi Electric Corp., 3.TUAT)

Keywords:Graphene, Surface Acoustic Wave

Charge transportation induced by surface acoustic wave (SAW) propagation in graphene in solution was investigated. The sign of current was found to switch when crossing the Dirac point because the major carrier was transitioned from holes to electrons by the change in electrolyte-gate voltage. The current also exhibited a peak value under conditions of both hole and electron conduction. These results can be explained based on a change in the major carrier in the graphene, as well as a change in the carrier mobility of the graphene.