Title
Very stable electron field emission from strontium titanate coated carbon nanotube matrices with low emission thresholds
Document Type
Article
Publication Date
11-30-2012
Abstract
Novel PMMA–STO–CNT matrices were created by opened-tip vertically aligned multiwalled carbon nanotubes (VA-MWCNTs) with conformal coatings of strontium titanate (STO) and poly(methyl methacrylate) (PMMA). Emission threshold of 0.8 V/μm was demonstrated, about 5-fold lower than that of the as-grown VA-MWCNTs. This was obtained after considering the related band structures under the perspective of work functions and tunneling width as a function of the STO thickness. We showed that there is an optimum thickness of STO coatings to effectively reduce the work function of CNTs and yet minimize the tunneling width for electron emissions. Furthermore, simulation and modeling suggest that PMMA–STO–CNT matrices have suppressed screening effects and Coulombs’ repulsion forces between electrons in adjacent CNTs, leading to low emission threshold, high emission density, and prolonged emission stability. These findings are important for practical application of VA-MWCNTs in field emission devices, X-ray generation, and wave amplification.
Publication Title
ACS Nano
Recommended Citation
Pandey, A.,
Prasad, A.,
Moscatello, J. P.,
Endelhard, M.,
Wang, C.,
&
Yap, Y. K.
(2012).
Very stable electron field emission from strontium titanate coated carbon nanotube matrices with low emission thresholds.
ACS Nano,
7(1), 117-125.
http://doi.org/10.1021/nn303351g
Retrieved from: https://digitalcommons.mtu.edu/physics-fp/324
Publisher's Statement
Copyright © 2012 American Chemical Society. Publisher’s version of record: https://dx.doi.org/10.1021/nn303351g