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

Kedawat, Garima; Kumar, Pawan; Singh, Satyendra; Suryawanshi, Sachin R.; Agrawal, Neetu; Gupta, Govind; Kim, Ah Ra; Gupta, R. K.; More, Mahendra A.; Late, Dattatray J.; Hahm, Myung Gwan

doi:10.1039/c5ra25682h

Cited by 11 publications

(8 citation statements)

References 34 publications

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“…The enhancement of the electric field at the emitter can be determined by the field enhancement factor owing to atomically sharp tips with their nano-metric protrusions. 2 The calculated field enhancement factor of vertically aligned CNTs-based emission device from the slope of the Fowler-Nordehim plot is ∼ 6917 by considering work function (φ) of the emitter ∼5 eV for CNTs. Zanin et al calculated theoretical geometrical enhancement factor β around 2000 on the basis of the ratio of height and radius of individual nanotubes.…”

Section: -6mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Conductivity, resistance of emitter/substrate interfaces, surface work function of material and emitter tip quality are some of the important factors which determine the efficiency of field-emission. 2,4 For field emission display applications, it is necessary to grow vertically aligned carbon nanotube (CNT) arrays on a large scale with suitable emitter density and high aspect ratio. 2,4,5 Among different structure of CNTs, pillar-shaped vertically aligned CNTs exhibit several supportive properties such as an electron source emitter, high aspect ratio, radius of curvature in nano regime, low stiffness, excellent chemical inertness, better thermal stability, and good mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

“…2,4 For field emission display applications, it is necessary to grow vertically aligned carbon nanotube (CNT) arrays on a large scale with suitable emitter density and high aspect ratio. 2,4,5 Among different structure of CNTs, pillar-shaped vertically aligned CNTs exhibit several supportive properties such as an electron source emitter, high aspect ratio, radius of curvature in nano regime, low stiffness, excellent chemical inertness, better thermal stability, and good mechanical strength. 5 Vertically aligned CNTs also known as a CNT forest, are a porous material that is well known for its exceptional optical absorbance property.…”

Section: Introductionmentioning

confidence: 99%

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High-performance field emission device utilizing vertically aligned carbon nanotubes-based pillar architectures

et al. 2018

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The vertical aligned carbon nanotubes (CNTs)-based pillar architectures were created on laminated silicon oxide/silicon (SiO2/Si) wafer substrate at 775 °C by using water-assisted chemical vapor deposition under low pressure process condition. The lamination was carried out by aluminum (Al, 10.0 nm thickness) as a barrier layer and iron (Fe, 1.5 nm thickness) as a catalyst precursor layer sequentially on a silicon wafer substrate. Scanning electron microscope (SEM) images show that synthesized CNTs are vertically aligned and uniformly distributed with a high density. The CNTs have approximately 2–30 walls with an inner diameter of 3–8 nm. Raman spectrum analysis shows G-band at 1580 cm−1 and D-band at 1340 cm−1. The G-band is higher than D-band, which indicates that CNTs are highly graphitized. The field emission analysis of the CNTs revealed high field emission current density (4mA/cm2 at 1.2V/μm), low turn-on field (0.6 V/μm) and field enhancement factor (6917) with better stability and longer lifetime. Emitter morphology resulting in improved promising field emission performances, which is a crucial factor for the fabrication of pillared shaped vertical aligned CNTs bundles as practical electron sources.

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Section: -6mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-performance field emission device utilizing vertically aligned carbon nanotubes-based pillar architectures

et al. 2018

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“…Thus, the emitter surface plays the most important role in all emission processes [29,30]. Depending on the type of impurities adsorbed on the emitter surface, as well as the surface topology, the emission properties of the material may deteriorate or improve [31][32][33][34][35][36]. Moreover, the impurities and topology determine the energy of the surface and the electron charge density distribution.…”

Section: Atomistic Model Of the Nanoporous Carbon Surfacementioning

confidence: 99%

Controlling the Electronic Properties of a Nanoporous Carbon Surface by Modifying the Pores with Alkali Metal Atoms

2020

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We investigate a process of controlling the electronic properties of a surface of nanoporous carbon glass-like thin films when the surface pores are filled with potassium atoms. The presence of impurities on the surface in the form of chemically adsorbed hydrogen and oxygen atoms, and also in the form of hydroxyl (OH) groups, is taken into account. It is found that even in the presence of impurities, the work function of a carbon nanoporous glass-like film can be reduced by several tenths of an electron volt when the nanopores are filled with potassium atoms. At the same time, almost all potassium atoms are ionized, losing one electron, which passes to the carbon framework of the film. This is due to the nanosizes of the pores in which the electron clouds of the potassium atom interact maximally with the electrons of the carbon framework. As a result, this leads to an improvement in the electrical conductivity and an increase in the electron density at the Fermi level. Thus, we conclude that an increase in the number of nanosized pores on the film surface makes it possible to effectively modify it, providing an effective control of the electronic structure and emission properties.

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Kharisov

Kharissova

2019

Carbon Allotropes: Metal-Complex Chemistry, Properties and Applications

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

Abstract: A novel strategy for the synthesis of highly ordered low-aspect ratio carbon nanocup arrays and its field emission properties.

Cited by 11 publications

References 34 publications

High-performance field emission device utilizing vertically aligned carbon nanotubes-based pillar architectures

High-performance field emission device utilizing vertically aligned carbon nanotubes-based pillar architectures

Controlling the Electronic Properties of a Nanoporous Carbon Surface by Modifying the Pores with Alkali Metal Atoms

Student Zone: Overview, Training, Practices, and Exercises

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