This study reports Pt-decorated ZnO nanorod arrays (Pt/ZnO NRs) fabricated by low-cost hydrothermal and sputtering processes, which have excellent field emission (FE) performance. The effects of the Pt thickness on the morphology, structure and FE properties of ZnO NRs were investigated. It was found that highly oriented ZnO NRs with sharp tips were grown on a Zn substrate and the surface of ZnO NRs were uniformly covered with Pt nanoparticles (NPs) with a diameter of around 2–3 nm. The FE properties of ZnO NRs were greatly improved by optimizing the amount of Pt NPs. The results found that the ZnO NR emitters coated with Pt NPs of 15 nm thickness (Pt15/ZnO NRs) exhibited the best FE characteristics, which have the lowest turn-on field at 1.45 V μm⁻¹ and the highest field enhancement factor of around 5405. More importantly, the maximum emission current density of as-fabricated Pt15/ZnO NR emitters was about 1900 times that of the bare ZnO emitters. The Pt coating not only improves electron conduction and heat dissipation of the emitters but also balances the emission point density and the screening effect.

中文翻译：

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Zn基体上高度取向的ZnO / Pt核壳纳米棒的合成，结构和优化的场发射特性

这项研究报告了通过低成本水热和溅射工艺制造的具有Pt装饰的ZnO纳米棒阵列（Pt / ZnO NRs），它们具有出色的场发射（FE）性能。研究了铂厚度对ZnO NRs的形貌，结构和有限元性能的影响。结果发现，具有尖锐尖端的高度取向的ZnO NRs在Zn衬底上生长，并且ZnO NRs的表面均匀地被直径约2-3 nm的Pt纳米颗粒（NPs）覆盖。通过优化Pt NPs的含量，可以大大改善ZnO NRs的FE特性。结果发现，涂有15nm的厚度（PT15 /氧化锌NRS）的铂纳米颗粒在ZnO NR发射器在1.45微米V表现出最佳特性FE，其具有最低的开启电场^-1最大场增强因子约为5405。更重要的是，制成的Pt15 / ZnO NR发射极的最大发射电流密度约为裸ZnO发射极的1900倍。Pt涂层不仅改善了发射极的电子传导和散热，而且平衡了发射点密度和屏蔽效果。