TU Darmstadt / ULB / TUbiblio

Vertically-Aligned Single-Crystal Nanocone Arrays: Controlled Fabrication and Enhanced Field Emission

Duan, Jing Lai and Lei, Dang Yuan and Chen, Fei and Lau, Shu Ping and Milne, William I. and Toimil-Molares, M. E. and Trautmann, Christina and Liu, Jie (2016):
Vertically-Aligned Single-Crystal Nanocone Arrays: Controlled Fabrication and Enhanced Field Emission.
In: ACS Applied Materials & Interfaces, ACS Publications, pp. 472-479, 8, (1), ISSN 1944-8244, [Online-Edition: http://dx.doi.org/10.1021/acsami.5b09374],
[Article]

Abstract

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° to 6.2° 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/μm at current density of 10 μA/cm2 (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.

Item Type: Article
Erschienen: 2016
Creators: Duan, Jing Lai and Lei, Dang Yuan and Chen, Fei and Lau, Shu Ping and Milne, William I. and Toimil-Molares, M. E. and Trautmann, Christina and Liu, Jie
Title: Vertically-Aligned Single-Crystal Nanocone Arrays: Controlled Fabrication and Enhanced Field Emission
Language: English
Abstract:

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° to 6.2° 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/μm at current density of 10 μA/cm2 (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.

Journal or Publication Title: ACS Applied Materials & Interfaces
Volume: 8
Number: 1
Publisher: ACS Publications
Uncontrolled Keywords: ion track template, copper, single-crystal, nanocone array, field emission
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 18 Apr 2016 07:49
Official URL: http://dx.doi.org/10.1021/acsami.5b09374
Identification Number: doi:10.1021/acsami.5b09374
Funders: The financial support from the National Natural Science Foundation of China (Grant Nos. 11175221, 11474240, 11375241, and 11179003) and the Hong Kong Research Grants Council (ECS Grant No. 509513) are acknowledged., The financial support from the Hong Kong Innovation and Technology Commission (ITF Grant No. ITS/ 196/13), and the West Light Foundation of the Chinese Academy of Sciences are acknowledged.
Export:

Optionen (nur für Redakteure)

View Item View Item