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Flexible Transparent Nanogenerators Utilizing Shape‐Modulated ZnO Nanorod Arrays on Graphene Electrodes
Author(s) -
Son Myungwoo,
Jang Hanbyeol,
Lee MiSo,
Yoon TaeHo,
Lee Byoung Hun,
Lee Woong,
Ham MoonHo
Publication year - 2018
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201700355
Subject(s) - materials science , polydimethylsiloxane , nanorod , graphene , fabrication , polyethylene terephthalate , nanotechnology , electrode , optoelectronics , piezoelectricity , transfer printing , power density , composite material , power (physics) , medicine , chemistry , alternative medicine , pathology , physics , quantum mechanics
Flexible and transparent hybrid piezoelectric nanogenerators (PENGs) are prepared, based on vertical arrays of shape‐modulated ZnO nanorods (ZnO‐NRs) placed between two single‐layer graphene sheets. A simple transfer printing method using polydimethylsiloxane (PDMS) stamps in conjunction with polyethylene terephthalate (PET) enables the fabrication of flexible stacked structures of ZnO‐NRs/graphene/PDMS/PET, and the morphology of the ZnO‐NRs is controlled by metallic additives during their hydrothermal synthesis. The hybrid PENGs are transparent and generated electrical power upon bending; the power output performance is dependent on the nanorod morphology with a net volume power density of 0.0513 mW mm −3 for Cd‐doped ZnO‐NRs, which is comparable to that of today's energy storage devices. The variation in output power is ascribed to the differences in the deformation modes of ZnO‐NRs on bending because of the differences in their aspect ratios that are, in turn, controlled by the metallic additives; this suggests the possibility of customizing the power generation characteristics within a single material system.