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Synthesis of needle-shape ZnO-ZnS core-shell heterostructures and their optical and field emission properties

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Abstract

Well-aligned ZnO-ZnS core-shell nano-needle arrays were synthesized using a simple aqueous solution approach to investigate the optical and field emission properties of heterostructure materials. The photoluminescence of the core-shell nano-needles exhibits a distinct enhancement compared with that of uncoated ZnO nano-needles. The UV-vis spectra show that the ZnS shell layer enhances the optical absorption of ZnO nano-needles by decreasing the interface band gap, which indicates the potential application of heterostructures in photovoltaic and solar cells. The core-shell nano-needles exhibit a remarkably high field enhancement factor of 3.74 × 103, a low turn-on field of 2.31 V/μm, and a high time stability. These findings show that the construction of core-shell heterostructure can efficiently improve the field emission performance of ZnO nano-needles, which is a promising route for the development of novel nanoemitters with controllable morphology and as suitable shell materials for heterostructures.

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Authors and Affiliations

  1. Centre of Nanoscience and Nanotechnology (NANO-SciTech Centre), Institute of Science, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia

    Jalal Rouhi & Mohamad Rusop Mahmood

  2. NANO-ElecTronic Centre, Faculty of Electrical Engineering, Universiti Teknologi MARA, 40450, Shah Alam, Selangor, Malaysia

    Jalal Rouhi & Mohamad Rusop Mahmood

  3. Department of Physics, University of Malaya, 50603, Kuala Lumpur, Malaysia

    C. H. Raymond Ooi

  4. Institute Nano-Optoelectronic Research and Technology (INOR), School of Physics, Universiti Sains Malaysia, 11800, Pulau Pinang, Malaysia

    Shahrom Mahmud

Authors
  1. Jalal Rouhi
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  2. C. H. Raymond Ooi
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  3. Shahrom Mahmud
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  4. Mohamad Rusop Mahmood
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Correspondence to Jalal Rouhi.

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Rouhi, J., Ooi, C.H.R., Mahmud, S. et al. Synthesis of needle-shape ZnO-ZnS core-shell heterostructures and their optical and field emission properties. Electron. Mater. Lett. 11, 957–963 (2015). https://doi.org/10.1007/s13391-015-5097-7

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  • DOI: https://doi.org/10.1007/s13391-015-5097-7

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