| Autor: |
Tang, Shuai, Tang, Jie, Chiu, Ta-wei, Hayami, Wataru, Uzuhashi, Jun, Ohkubo, Tadakatsu, Uesugi, Fumihiko, Takeguchi, Masaki, Mitome, Masanori, Qin, Lu-Chang |
| Zdroj: |
Nano Research; Jun2020, Vol. 13 Issue 6, p1620-1626, 7p |
| Abstrakt: |
Electric field-induced point electron source is highly demanded for microscopy, spectroscopy, lithography, X-ray tubes, microwave devices, and data displays. However, the instability in emission current and requirement of ultrahigh vacuum have often limited its extensive applications. Herewith we report a single-crystalline HfC nanowire with oxycarbide emission surface for stable electron emission at 50 nA with fluctuations less than 1% in a vacuum of 4 × 10−7 Pa. The emitter has a low work function of 2.5 eV measured by the field emission Fowler-Nordheim curve and it is in good agreement with density functional theory (DFT) calculations. The energy spread is in a range of 0.21–0.26 eV with a corresponding reduced brightness 1.95 × 1011−3.81 × 1011 A·m−2·sr−1·V−1. The HfC nanowire with oxycarbide emission surface is a qualified candidate for the next-generation electron source with high brightness, large current, and low energy spread. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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