期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 1, 页码 472-479出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09374
关键词
ion track template; copper; single-crystal; nanocone array; field emission
资金
- National Natural Science Foundation of China [11175221, 11474240, 11375241, 11179003]
- Hong Kong Research Grants Council (ECS) [509513]
- Hong Kong Innovation and Technology Commission (ITF) [ITS/196/13]
- West Light Foundation of the Chinese Academy of Sciences
Metal nanostructures with conical shape, vertical alignment, large ratio of cone height and curvature radius at the apex, controlled cone angle, and single-crystal structure are ideal candidates for enhancing field electron-emission efficiency with additional merits, such as good mechanical and thermal stability. However, fabrication of such nanostructures possessing all these features is challenging. Here, we report on the controlled fabrication of large scale, vertically aligned, and mechanically self-supported single-crystal Cu nanocones with controlled cone angle and enhanced field emission. The Cu nanocones were fabricated by ion-track templates in combination with electrochemical deposition. Their cone angle is controlled in the range from 0.3 degrees to 6.2 degrees by asymmetrically selective etching of the ion tracks and the minimum tip curvature diameter reaches down to 6 nm. The field emission measurements show that the turn-on electric field of the Cu nanocone field emitters can be as low as 1.9 V/mu m at current density of 10 mu A/cm(2) (a record low value for Cu nanostructures, to the best of our knowledge). The maximum field enhancement factor we measured was as large as 6068, indicating that the Cu nanocones are promising candidates for field emission applications.
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