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Facile Zinc Oxide Nanowire Growth on Graphene via Hydrothermal Floating Method: Towards Debye Length Radius Nanowires for Ultraviolet Photodetection

Abstract

Vertically aligned zinc oxide nanowires on graphene (ZnO-NWs/graphene) heterojunction nanohybrids combine the superior sensitivity of crystalline ZnO-NWs with high charge mobility of graphene to provide an ideal platform for high-performance detectors and sensors. Controlling the ZnO-NW microstructure and ZnO-NWs/graphene interface is of primary importance to the device performance. This work explores a floating hydrothermal growth of ZnO-NWs on seedless and ZnO seeded graphene, and investigates the effects of the microstructure and interface on the performance of the ZnO-NW/graphene ultraviolet (UV) detectors. It has been found that the ZnO seed layer facilitates growth of a dense ZnO-NW array with a NW radius approaching the Debye length. In contrast, the seedless process results in a lower NW areal density and a larger NW diameter on the order of sub-to-few micrometers. Consequently, higher UV responsivity up to 728 A/W was obtained in the former. However, a strong charge trapping effect was also observed, which is attributed to the poorer crystallinity of the ZnO-NWs originating from the ZnO seed layer. This result sheds light on the importance of controlling the microstructure and interface towards high-performance ZnO-NW/graphene nanohybrid optoelectronics.

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Publication details

The article was received on 24 Jul 2017, accepted on 08 Sep 2017 and first published on 08 Sep 2017


Article type: Paper
DOI: 10.1039/C7TC03325G
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Facile Zinc Oxide Nanowire Growth on Graphene via Hydrothermal Floating Method: Towards Debye Length Radius Nanowires for Ultraviolet Photodetection

    B. Cook, Q. Liu, J. Liu, M. Gong, D. Ewing, M. Casper, A. Stramel and J. Wu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC03325G

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