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

• DOI: 10.1021/acsami.5b09374
• Publication Date: 2015-12-14T21:56:46Z
• Authors: Jing Lai Duan; Dang Yuan Lei; Fei Chen; Shu Ping Lau; William I. Milne; M. E. Toimil-Molares; Christina Trautmann; Jie Liu
• Keywords: Crystal (programming language)

Metal nanostructures with conical shape, vertical alignment, large ratio of cone height and curvature radius at the apex, controlled angle, single-crystal structure are ideal candidates for enhancing field electron-emission efficiency additional merits, such as good mechanical thermal stability. However, fabrication possessing all these features is challenging. Here, we report on scale, vertically aligned, mechanically self-supported Cu nanocones angle enhanced emission. The were fabricated by ion-track templates in combination electrochemical deposition. Their range from 0.3° to 6.2° asymmetrically selective etching ion tracks minimum tip diameter reaches down 6 nm. emission measurements show that turn-on electric nanocone emitters can be low 1.9 V/μm current density 10 μA/cm(2) (a record value nanostructures, best our knowledge). maximum enhancement factor measured was 6068, indicating promising applications.