非阻塞I/O
材料科学
光致发光
棒
场电子发射
带隙
光电子学
分析化学(期刊)
光学
化学
医学
物理
病理
电子
催化作用
量子力学
生物化学
色谱法
替代医学
作者
Zhengjun Zhang,Yaohua Zhao,Min Zhu
摘要
By thermally heating a nickel foil in a vacuum of ∼5×10−2Torr, films consisting of vertically aligned cone-shaped NiO microrods were deposited on Si (001) substrates at a temperature of <300°C. The NiO rods were grown along ⟨001⟩ directions by stacking the NiO (001) nanoslices, and are ∼10μm long with a sharp nanosized tip. Due to this morphology, the NiO film exhibited a threshold field of ∼6.5V∕μm in field emission and a field enhancement factor of 2130 that is sufficiently high for field emission applications. The optical band gap of the NiO film was estimated to be ∼3.68eV from the optical absorption measurement and was almost a constant upon heating. In addition, the NiO film exhibited a strong photoluminescence at ∼674nm when excited by a 514 nm Ar+ laser, which might be attributed to the oxygen vacancies.
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