Improved Field Emission Properties of Carbon Nanostructures by Laser Surface Engineering

Nanomaterials

NguyenTuan Hong¹  NguyenKhac Hiep¹  PhanNgoc Hong¹  MinhDang Nguyen²  InHyung Baek³  MinhNhat Dang⁴ 

[1] Centre for High Technology Development, VAST, 18 Hoang Quoc Viet, Hanoi 100000, Vietnam;Department of Chemistry, University of Houston, Houston, TX 77204-5003, USA;Korea Atomic Energy Research Institute, Daeduk-Daero 989-111, Daejeon, Korea;The Australian Research Council (ARC) Industrial Transformation Training Centre in Surface Engineering for Advanced Materials (SEAM), Faculty of Science, Engineering and Technology, Swinburne University of Technology, P.O. Box 218, Hawthorn, VIC 3122, Australia;

关键词: carbon nanotubes;    hot-filament CVD;    graphene;    field electron emission;    laser machining;   

DOI  :  10.3390/nano10101931

来源: DOAJ

【 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/µm, a sustainable current of approximately 2 mA (about 112 mA/cm²) at an applied field of less than 2 V/µm. 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.

【 授权许可】

Unknown