Issue 12, 2016

Field emission properties of highly ordered low-aspect ratio carbon nanocup arrays

Abstract

Herein, we design and develop a field emission device utilizing highly porous carbon nanocup (CNC) films. These three-dimensional (3D) low-aspect ratio CNC structures were fabricated by a combination of anodization and chemical vapor deposition techniques. The low turn-on fields of 2.30 V μm−1 were observed to draw an emission current density of 1 μA cm−2 and a maximum emission current density of ∼1.802 mA cm−2 drawn at an applied field of ∼4.20 V μm−1. The enhanced field emission behavior observed from the CNC films is attributed to an excellent field enhancement factor of 1645. The observed field emission properties of CNC arrays are attributed to a synergistic combination of high aspect ratio, nano-sized radius of curvature, highly organized distribution of the emitters over the whole area of specimen and lower screening effect of the CNC arrays. These observations shed light on the effect of the stacking carbon layers of CNC on their electronic properties and open up possibilities to integrate new morphologies of graphitic carbon in nanotechnology applications. Thus, the low turn on field, high emission current density and better emission current stability enable CNC based future field emission applications.

Graphical abstract: Field emission properties of highly ordered low-aspect ratio carbon nanocup arrays

Supplementary files

Article information

Article type
Communication
Submitted
02 Dec 2015
Accepted
13 Jan 2016
First published
18 Jan 2016

RSC Adv., 2016,6, 9932-9939

Author version available

Field emission properties of highly ordered low-aspect ratio carbon nanocup arrays

B. K. Gupta, G. Kedawat, P. Kumar, S. Singh, S. R. Suryawanshi, N. Agrawal (Garg), G. Gupta, A. R. Kim, R. K. Gupta, M. A. More, D. J. Late and M. G. Hahm, RSC Adv., 2016, 6, 9932 DOI: 10.1039/C5RA25682H

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