4.7 Article

ZnO Nanorod/Graphene Hybrid-Structures Formed on Cu Sheet by Self-Catalyzed Vapor-Phase Transport Synthesis

期刊

NANOMATERIALS
卷 11, 期 2, 页码 -

出版社

MDPI
DOI: 10.3390/nano11020450

关键词

ZnO nanorod; graphene; Cu sheet; self-catalyzed synthesis; hybrid-nanojunction; UV device

资金

  1. International Research and Development program of the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology (MEST) of Korea [2016R1A6A 1A03012877]

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High crystalline ZnO nanorods were successfully synthesized on Zn pre-deposited graphene/Cu sheet without graphene transfer process. The pre-deposited Zn metal on graphene acts as a seed and passivates the graphene. This hetero-nanostructure showed promising results in terms of photocurrent and absorption characteristics.
High crystalline ZnO nanorods (NRs) on Zn pre-deposited graphene/Cu sheet without graphene transfer process have been fabricated by self-catalyzed vapor-phase transport synthesis. Here, the pre-deposited Zn metal on graphene not only serves as a seed to grow the ZnO NRs, but also passivates the graphene underneath. The temperature-dependent photoluminescence spectra of the fabricated ZnO NRs reveal a dominant peak of 3.88 eV at 10 K associated with the neutral-donor bound exciton, while the redshifted peak by bandgap shrinkage with temperature and electron-lattice interactions leads a strong emission at 382 nm at room temperature. The optical absorption of the ZnO NRs/graphene hetero-nanostructure at this ultraviolet (UV) emission is then theoretically analyzed to quantify the absorption amount depending on the ZnO NR distribution. By simply covering the ZnO NR/graphene/Cu structure with the graphene/glass as a top electrode, it is observed that the current-voltage characteristic of the ZnO NR/graphene hetero-nanojunction device exhibits a photocurrent of 1.03 mA at 3 V under a light illumination of 100 mu W/cm(2). In particular, the suggested graphene/ZnO NRs/graphene hybrid-nanostructure-based devices reveal comparable photocurrents at a bidirectional bias, which can be a promising platform to integrate 1D and 2D nanomaterials without complex patterning process for UV device applications.

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