Fabrication of Large-Scale Single-Crystalline PrB6 Nanorods and Their Temperature-Dependent Electron Field Emission

Authors

  • Qin Yuan Zhang,

    Corresponding author
    1. MOE Key Lab of Specially Functional Materials South China University of Technology Guangzhou 510641 (P. R. China)
    • MOE Key Lab of Specially Functional Materials South China University of Technology Guangzhou 510641 (P. R. China).
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  • Jun Qi Xu,

    1. Department of Physics South China University of Technology Guangzhou 510641 (P. R. China)
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  • Yan Ming Zhao,

    Corresponding author
    1. Department of Physics South China University of Technology Guangzhou 510641 (P. R. China)
    • Department of Physics South China University of Technology Guangzhou 510641 (P. R. China).
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  • Xiao Hong Ji,

    1. School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 (Singapore)
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  • Shu Ping Lau

    Corresponding author
    1. School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 (Singapore)
    2. Present address: Department of Applied Physics The Hong Kong Polytechnic University Hung Hom, Kowloon, Hong Kong (P. R. China)
    • School of Electrical and Electronic Engineering Nanyang Technological University Singapore 639798 (Singapore).
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Abstract

A simple catalysis-free approach that utilises a gas–solid reaction for the synthesis of large-scale single-crystalline PrB6 nanorods using Pr and BCl3 as starting materials is demonstrated. The nanorods exhibit a low turn-on electric field (2.80 V µ-b;m−1 at 10 µ-b;A cm−2), a low threshold electric field (6.99 V µ-b;m−1 at 1 mA cm−2), and a high current density (1.2 mA cm−2 at 7.35 V µ-b;m−1) at room temperature (RT). The turn-on and threshold electric field are found to decrease clearly from 2.80 to 0.95 and 6.99 to 3.55 V µ-b;m−1, respectively, while the emission current density increases significantly from 1.2 to 13.8 mA cm−2 (at 7.35 V µ-b;m−1) with an increase in the ambient temperature from RT to 623 K. The field enhancement factor, emission current density, and the dependence of the effective work function with temperature are investigated. The possible mechanism of the temperature-dependent emission from PrB6 nanorods is discussed.

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