Emitter spacing effects on field emission properties of laser-treated single-walled carbon nanotube buckypapers
Chen, YiWen; Miao, Hsin-Yuan; Lin, Ryan Jiyao; Zhang, Mei; Liang, Richard; Zhang, Chuck; Wang, Ben; Chen, YiWen; High-Performance Materials Institute, Florida State University, Tallahassee, FL 32310, USA; Miao, Hsin-Yuan; High-Performance Materials Institute, Florida State University, Tallahassee, FL 32310, USA ; Department of Electrical Engineering, Tunghai University, 181 Taichung Harbor Road, Section 3, Taichung 40704, Taiwan ;; Lin, Ryan Jiyao; Department of Electrical and Computer Engineering, Rose-Hulman Institute of Technology, Terre Haute, IN 47803, USA; Zhang, Mei; High-Performance Materials Institute, Florida State University, Tallahassee, FL 32310, USA ;; Liang, Richard; High-Performance Materials Institute, Florida State University, Tallahassee, FL 32310, USA; Zhang, Chuck; High-Performance Materials Institute, Florida State University, Tallahassee, FL 32310, USA; Wang, Ben; High-Performance Materials Institute, Florida State University, Tallahassee, FL 32310, USA
Журнал:
Nanotechnology
Дата:
2010-12-10
Аннотация:
Carbon nanotube (CNT) emitters on buckypaper were activated by laser treatment and their field emission properties were investigated. The pristine buckypapers and CNT emitters’ height, diameter, and spacing were characterized through optical analysis. The emitter spacing directly impacted the emission results when the laser power and treatment times were fixed. The increasing emitter density increased the enhanced field emission current and luminance. However, a continuous and excessive increase of emitter density with spacing reduction generated the screening effect. As a result, the extended screening effect from the smaller spacing eventually crippled the field emission effectiveness. Luminance intensity and uniformity of field emission suggest that the highly effective buckypaper will have a density of 2500 emission spots cm<sup> − 2</sup>, which presents an effective field enhancement factor of 3721 and a moderated screening effect of 0.005. Proper laser treatment is an effective post-treatment process for optimizing field emission, luminance, and durability performance for buckypaper cold cathodes.
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