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Nanoscale electron field emitters are known to produce more stable electron emissions than conventional emitters. This has been attributed to size effects; nanoscale emitters can operate with a small emission current and a low extraction voltage, which reduces the bombardment of residual gas ions on the emitter tip. However, our experiments discovered that nanoscale LaB6 emitters had extremely stable emissions, suggesting that chemical effects are present in addition to size effects. This suggests that during operations, a material other than LaB6 may be deposited on the surface of the tip to enhance the stability of emissions. Therefore, we searched for possible materials theoretically within the La-B-O ternary system and found that lanthanum oxides (LaO) and oxygen-deficient La2O3 (La2O3−x) had good electrical conductivity and a low work function comparable to that of LaB6. These lanthanum oxides are chemically less reactive to residual gases than LaB6. Thus, if they are present on the LaB6 surface, they could stabilize electron emissions without diminishing emission performance. These findings suggest that lanthanum oxides could be used for electron field emitters.

権利情報:

• https://creativecommons.org/licenses/by-nc/3.0/
  

キーワード: Lanthanum oxide, field emission, electron emitter

刊行年月日: 2022-10-11

出版者: Royal Society of Chemistry (RSC)

掲載誌:

• Nanoscale Advances (ISSN: 25160230) vol. 4 p. 4669-4676

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1039/d2na00536k

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更新時刻: 2026-05-11 16:26:20 +0900

MDRでの公開時刻: 2026-05-11 18:28:10 +0900