Nanoshaping field emitters from glassy carbon sheets: a new functionality induced by H-plasma etching

Gay, Stefano; Orlanducci, S.; Passeri, Daniele; Rossi, M.; Terranova, Maria Letizia

doi:10.1039/c6cp03606f

Cited by 4 publications

(6 citation statements)

References 35 publications

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“…Field-emission performances of the C-cork point emitter at the region of (b) low and (c) entire electric field and the Fowler–Nordheim (F–N) curve of the C-cork point emitter. (d) Long-term stability of the C-cork point emitter with a current density of 10 and 30 mA cm –2 for 12 h. (e) Comparison of the turn-on field and maximum current density that have been reported in the literature for nanocarbon field emitters. − ,− …”

Section: Resultsmentioning

confidence: 99%

High-Performance Field Emission from a Carbonized Cork

Lee

Yoo

et al. 2017

ACS Appl. Mater. Interfaces

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To broaden the range of application of electron beams, low-power field emitters are needed that are miniature and light. Here, we introduce carbonized cork as a material for field emitters. The light natural cork becomes a graphitic honeycomb upon carbonization, with the honeycomb cell walls 100-200 nm thick and the aspect ratio larger than 100, providing an ideal structure for the field electron emission. Compared to nanocarbon field emitters, the cork emitter produces a high current density and long-term stability with a low turn-on field. The nature of the cork material makes it quite simple to fabricate the emitter. Furthermore, any desired shape of the emitter tailored for the final application can easily be prepared for point, line, or planar emission.

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Section: Resultsmentioning

confidence: 99%

High-Performance Field Emission from a Carbonized Cork

Lee

Yoo

et al. 2017

ACS Appl. Mater. Interfaces

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“…GLC nanomaterials are promising materials for the manufacture of lithium-ion batteries [6,7] and capacitors [8] due to their anomalously high capacitance [9], as well as for creating on the basis of sensors for the detection of dopamine [10], adrenaline [11], chlorpromazine [12], and methyldopa [13]. Carbon nanoporous glass-like materials are also actively used in modern emission electronics [1,[25][26][27][28], in particular, for the fabrication of field cathodes based on them. Such cathodes have promising field emission parameters.…”

Section: Introductionmentioning

confidence: 99%

Effect of Functionalization with Potassium Atoms on the Electronic Properties of a 3D Glass-like Nanomaterial Reinforced with Carbon Nanotubes: In Silico Study

2022

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In this paper, using the self-consistent charge density-functional tight-binding (SCC DFTB) method, we perform an in silico study of the effect of functionalization by potassium atoms on the electronic properties of a new configuration of the glass-like carbon (GLC) reinforced with (4,4) and (6,5) single-walled carbon nanotubes (SWCNTs). The method of classical molecular dynamics was used to obtain energetically stable GLC configurations with different mass fractions of potassium. It is found that with an increase in the mass fraction of SWCNTs, the elasticity of GLC increases. It is shown that when the GLC structure reinforced with SWCNTs is filled with potassium, the number of available electronic states at the Fermi level increases compared to GLC without nanotubes, which significantly improves the emission and electrophysical characteristics of the carbon nanomaterial. For most structures, at a potassium/carbon mass ratio of 1:100 (0.01), an increase in the Fermi energy is observed, and, hence, a decrease in the work function. The maximum decrease in the work function by ~0.3 eV was achieved at a mass ratio of potassium/carbon of 1:4.5 (0.23) for GLC reinforced with (6,5) SWCNTs. It is revealed that, at a mass ratio of potassium/carbon of 1:28.5 (0.035), the quantum capacitance of GLC reinforced with (4,4) and (6,5) SWCNTs increases by ~9.4% (1752.63 F/g) and 24.1% (2092.04 F/g), respectively, as compared to GLC without nanotubes (1587.93 F/g). Based on the results obtained, the prospects for the application of the proposed GLC configuration in emission electronics devices are predicted.

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“…It is well known that carbon nanoporous glass-like materials are actively used in modern emission electronics [1][2][3][4][5][6]. In particular, they are very promising for the manufacture of field emission cathodes based on them.…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, the question of the effect of the emitting tip surface on the emission properties remains topical. At present, it is possible to modify and nanostructure the surface of porous carbon glass-like materials [2], which makes it possible to sharply increase the field enhancement factor β by 4-5, because a thin surface layer of the emitting material plays a decisive role in autocathodes. This layer may be compared with a film of a thickness of several tens of nanometers, as shown by Gay et al [2].…”

Section: Introductionmentioning

confidence: 99%

“…At present, it is possible to modify and nanostructure the surface of porous carbon glass-like materials [2], which makes it possible to sharply increase the field enhancement factor β by 4-5, because a thin surface layer of the emitting material plays a decisive role in autocathodes. This layer may be compared with a film of a thickness of several tens of nanometers, as shown by Gay et al [2]. A typical scanning electron microscope (SEM) image of the emitting surface of a nanoporous carbon glass-like emitter is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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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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Nanoshaping field emitters from glassy carbon sheets: a new functionality induced by H-plasma etching

Cited by 4 publications

References 35 publications

High-Performance Field Emission from a Carbonized Cork

High-Performance Field Emission from a Carbonized Cork

Effect of Functionalization with Potassium Atoms on the Electronic Properties of a 3D Glass-like Nanomaterial Reinforced with Carbon Nanotubes: In Silico Study

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

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