The preparation of oxygen-deficient ZnO nanorod arrays and their enhanced field emission |
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| Affiliation: | 1. School of Physics, Northwest University, 710069, China;2. Department of Physics, The Hong Kong University of Science and Technology, Hong Kong;3. Northwest Institute for Non-ferrous Metal Research, Xi’an 710016, China;4. National Key Laboratory and Incubation Base of Photoelectric Technology and Functional Materials, Northwest University, Xi’an 710069, China;1. Display Reseach Center, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, PR China;2. School of Information Engineering, Nanjing Normal University Taizhou Collage, Taizhou, 225300, PR China;1. Department of Nanoscience and Technology, Bharathiar University, Coimbatore, India;2. Advanced Materials and Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore, India |
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| Abstract: | Vertical and uniform zinc oxide (ZnO) nanorod arrays (NRAs) with sharp tips were fabricated on Zn substrate by a straightforward hydrothermal method without the assistance of seed layer, template or surfactant. Whereafter, the as-synthesized ZnO NRAs were successfully doped with oxygen vacancies by sodium borohydride (NaBH4) solution reduction, aiming to generate donor energy levels below the conduction band. More importantly, the doped concentration of oxygen vacancies could be effectively controlled by adjusting the reduction temperature, and we have ultimately achieved the purpose of controllable tailoring the energy band structure of ZnO NRAs. As with design, the oxygen-deficient ZnO NRAs present a lower turn-on field of 0.67 V/μm, higher field enhancement factor of 64601 and better field emission stability. Such excellent FE performance of the as-prepared emitter should originate from the optimization of geometry, the efficient electron transport, as well as the decreased work function. |
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| Keywords: | ZnO nanorod arrays Oxygen vacancy Field emission |
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