期刊
ACS NANO
卷 7, 期 1, 页码 117-125出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn303351g
关键词
carbon nanotubes; strontium titanate; poly(methyl methacrylate); field emission
类别
资金
- Defense Advanced Research Projects Agency [DAAD17-03-C-0115]
- U.S. Department of Army [W911NF-04-1-0029]
- Department of Energy's Office of Biological and Environmental Research located at Pacific Northwest National Laboratory
Novel PMMA-STO-CNT matrices were created by I 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/mu m 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.
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