Improved Field Emission Properties of Carbon Nanostructures by Laser Surface Engineering

被引：6

作者：

Dang, Minh Nhat ^{[1
]}

Nguyen, Minh Dang ^{[2
,3
]}

Hiep, Nguyen Khac ^{[4
]}

Hong, Phan Ngoc ^{[4
]}

Baek, In Hyung ^{[5
]}

Hong, Nguyen Tuan ^{[4
]}

机构：

[1] Swinburne Univ Technol, Ind Transformat Training Ctr Surface Engn Adv Mat, Fac Sci Engn & Technol, Australian Res Council ARC, POB 218, Hawthorn, Vic 3122, Australia

[2] Univ Houston, Dept Chem, Univ Pk, Houston, TX 77204 USA

[3] Univ Sci & Technol Hanoi, Vietnam Acad Sci & Technol VAST, 18 Hoang Quoc Viet, Hanoi 100000, Vietnam

[4] VAST, Ctr High Technol Dev, 18 Hoang Quoc Viet, Hanoi 100000, Vietnam

[5] Korea Atom Energy Res Inst, Daeduk Daero 989-111, Daejeon, South Korea

来源：

NANOMATERIALS | 2020年 / 10卷 / 10期

关键词：

carbon nanotubes; hot-filament CVD; graphene; field electron emission; laser machining; NANOTUBES; FILMS;

D O I：

10.3390/nano10101931

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We herein present an alternative geometry of nanostructured carbon cathode capable of obtaining a low turn-on field, and both stable and high current densities. This cathode geometry consisted of a micro-hollow array on planar carbon nanostructures engineered by femtosecond laser. The micro-hollow geometry provides a larger edge area for achieving a lower turn-on field of 0.70 V/mu m, a sustainable current of approximately 2 mA (about 112 mA/cm(2)) at an applied field of less than 2 V/mu m. The electric field in the vicinity of the hollow array (rim edge) is enhanced due to the edge effect, that is key to improving field emission performance. The edge effect of the micro-hollow cathode is confirmed by numerical calculation. This new type of nanostructured carbon cathode geometry can be promisingly applied for high intensity and compact electron sources.

引用

页码：1 / 11

页数：11

共 39 条

[1] A new look at biomedical Ti-based shape memory alloys [J].