title: A flexible and transparent graphene/ZnO nanorod hybrid structure fabricated by exfoliating a graphite substrate.
abstract: We demonstrate the fabrication of a graphene/ZnO nanorod (NR) hybrid structure by mechanical exfoliation of ZnO NRs grown on a graphite substrate. We confirmed the existence of graphene sheets on the hybrid structure by analyzing the Raman spectra and current-voltage (I-V) characteristics. The Raman spectra of the exfoliated graphene/ZnO NR hybrid structure show G and 2D band peaks that are shifted to lower wavenumbers, indicating that the exfoliated graphene layer exists under a significant amount of strain. The I-V characteristics of the graphene/ZnO NR hybrid structure show current flow through the graphene layer, while no current flow is observed on the ZnO NR/polydimethylsiloxane (PDMS) composite without graphene, thereby indicating that the few-layer graphene was successfully transferred onto the hybrid structure. A piezoelectric nanogenerator is demonstrated by using the fabricated graphene/ZnO NR hybrid structure. The nanogenerator exhibits stable output voltage up to 3.04 V with alternating current output characteristics.
authors.affiliation: Department of Electronic Engineering, Yeungnam University, Gyeongbuk 712-749, South Korea. ikpark@ynu.ac.kr.
authors.forename: Gwang-Hee
authors.initials: GH
authors.lastname: Nam
authors.forename: Seong-Ho
authors.initials: SH
authors.lastname: Baek
authors.forename: Chang-Hee
authors.initials: CH
authors.lastname: Cho
authors.forename: Il-Kyu
authors.initials: IK
authors.lastname: Park