Modification of glassy carbon properties under low energy proton irradiation

Jovanović, Zoran; Kalijadis, Ana; Vasiljević-Radović, Dana; Erić, Marko; Laušević, Mila; Mentus, Slavko; Laušević, Ž.

doi:10.1016/j.carbon.2011.05.006

Cited by 8 publications

(5 citation statements)

References 40 publications

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“…In particular, the maximum quantum capacitance of the boron-doped (6,6) CNTs in negative and positive voltages was 304 F/g and 760 F/g, respectively. For boron-doped (16,16) CNTs, these values were found to be 335 F/g and 659 F/g, respectively [45]. The quantum capacitance of the MnSe2/CNT composite does not exceed 1300 F/g [46].…”

Section: Resultsmentioning

confidence: 90%

“…Due to their promising properties, GLC nanomaterials are in demand and very relevant in a wide range of applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. These materials have high thermal stability, mechanical strength, abrasion resistance, and chemical inertness, as well as isotropic electrical conductivity [2][3][4][15][16][17]. They are characterized by the presence of a large number of nanopores; that is, their density has clearly defined local regions with a high density several times higher than the average value.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 90%

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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“…The emission features enable us to foresee the fabrication of robust cold cathodes that can maintain their operational capabilities also in harsh environments and under extreme conditions, such as those related to confinements and neutralizations of plasmas, high density radiation, energetic ion fluxes. 10,12,34 The characteristics of electron emission from nanostructured GC are interesting even if compared to other C nanomaterials already used for cold cathode production. The emitted currents do not reach the values obtained for some CNT systems, such as the macroscopic fibers formed by aligned nanotubes, 35 but are comparable with the majority of emitting systems assembled with low density CNT films and considered efficient cold cathodes.…”

Section: Discussionmentioning

confidence: 99%

“…Among them, one can cite high thermal stability, high mechanical strength, high abrasion resistance, high chemical inertness, isotropic electrical conductivity, and low self-lubricity. [8][9][10][11] Starting from 1957, when General Electric (UK) firstly produced GC as a component for nuclear reactors, the race for modifications and developments of this attractive ungraphitizable carbon material, which can work efficiently under extreme conditions, has never stopped. 12 A lot of research studies have been devoted to modifications of GC surface layers to enhance the performances of electrodes 13,14 or to produce attractive catalyst materials and/or catalyst supporting systems, 11 whereas less attention has been paid to the use of GC for other applications, as, for example the fabrication of cold cathodes.…”

Section: Introductionmentioning

confidence: 99%

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

Gay

Orlanducci

Passeri

et al. 2016

Phys. Chem. Chem. Phys.

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This paper reports on the morphological and electrical characterization at the nanometer scale and the investigation of the field emission characteristics of glassy carbon (GC) plates which underwent H-induced physical/chemical processes occurring in a dual-mode MW-RF plasma reactor. Plasma treatment produced on the GC surface arrays of vertically aligned conically shaped nanostructures, with density and height depending on the plasma characteristics. Two kinds of samples obtained under two different bias regimes have been deeply analyzed using an AFM apparatus equipped with tools for electric forces and surface potential measurements. The features of electron emission via the Field Emission (FE) mechanism have been correlated with the morphology and the structure at the nanoscale of the treated glassy carbon samples. The measured current density and the characteristics of the emission, which follow the Fowler-Nordheim law, indicate that the plasma-based methodology utilized for the engineering of the GC surfaces is able to turn conventional GC plates into efficient emission devices. The outstanding properties of GC suggest the use of such nanostructured materials for the assembling of cold cathodes to be used in a harsh environment and under extreme P/T conditions.

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“…As already known, the emission tips of matrix cathodes with a high emission current density are traditionally produced on the basis of this mechanically strong material. Carbon glass-like materials have high strength, high heat resistance, abrasion resistance, and chemical inertness, as well as isotropic electrical conductivity [10,11]. It should also be noted that modern technology allows us to control the size of nanopores.…”

Section: Introductionmentioning

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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Modification of glassy carbon properties under low energy proton irradiation

Cited by 8 publications

References 40 publications

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

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

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

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

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