Emissivity of powders prepared from nanoporous carbon

Bondarenko, V. B.; Gabdullin, P. G.; Gnuchev, N. M.; Davydov, S. N.; Korablev, V. V.; Kravchik, A. E.; Соколов, В. В.

doi:10.1134/1.1809711

Cited by 14 publications

(5 citation statements)

References 11 publications

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“…Emission properties of NPCs were tested in the layout described previously in [35]. The emitter samples were prepared by deposition of NPC powders at metal substrates.…”

Section: Emission Propertiesmentioning

confidence: 99%

“…The field gap width was typically 0.5 mm. It was possible to vary the sample temperature between 20 ∘ C and 400 ∘ C, to remove volatile contaminants and to improve emission properties via relatively soft thermofield treatment procedures [35]. All investigated NPC species demonstrated comparable emission properties.…”

Section: Emission Propertiesmentioning

confidence: 99%

“…In the presented work, we investigated field-emission properties of nanoporous carbon (NPC) [27][28][29][30][31][32][33][34]-one of all-carbon materials with disordered nanoscale structure. Due to developed pore/skeleton interface, homogeneity of pore size, strong adsorption ability, relatively high electric conductivity, and mechanical strength, the NPC materials give considerable promise for diverse applications, including manufacture of field electron emitters [35] for microwave, light, and X-ray sources, plasma devices, space thrusters, and microelectronic components and gauges. NPC structure can be efficiently controlled via parameters of fabrication process, and our work was initially focused on investigation of correlation between structural and emission properties of this nanocarbon.…”

Section: Introductionmentioning

confidence: 99%

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Field‐Induced Electron Emission from Nanoporous Carbons

Архипов

Davydov

Gabdullin

et al. 2014

Journal of Nanomaterials

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Influence of fabrication technology on field electron emission properties of nanoporous carbon (NPC) was investigated. Samples of NPC derived from different carbides via chlorination at different temperatures demonstrated similar low-field emission ability with threshold electric field 2-3 V/μm. This property correlated with presence of nanopores with characteristic size 0.5–1.2 nm, determining high values of specific surface area (>800 m2/g) of the material. In most cases, current characteristics of emission were approximately linear in Fowler-Nordheim coordinates (excluding a low-current part near the emission threshold), but the plots’ slope angles were in notable disagreement with the known material morphology and electronic properties, unexplainable within the frames of the classical emission theory. We suggest that the actual emission mechanism for NPC involves generation of hot electrons at internal boundaries and that emission centers may be associated with relatively large (20–100 nm) onion-like particles observed in many microscopic images. Such particles can serve two functions: to provide additional “internal” enhancement of the electric field and to inhibit relaxation of hot charge carriers due to the “phonon bottleneck” effect.

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“…Emission properties of NPCs were tested in the layout described previously in [35]. The emitter samples were prepared by deposition of NPC powders at metal substrates.…”

Section: Emission Propertiesmentioning

confidence: 99%

Section: Emission Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Field‐Induced Electron Emission from Nanoporous Carbons

Архипов

Davydov

Gabdullin

et al. 2014

Journal of Nanomaterials

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“…In our studies, two basic types of nanocarbon materials were investigated: 'astralenes' -one of vacuum arc discharge products, a powder of comparatively large (100-150 nm) fulleroid particles 10,11 ; and nanoporous carbon ('NPC') 12 produced by the chemical removal of Si atoms from SiC. To prepare emitter samples, the active materials were either agglomerated in a ceramic matrix or deposited onto metal foils.…”

Section: Methodsmentioning

confidence: 99%

Hysteresis of pulsed characteristics of field emission from nanocarbon materials

Архипов

Mishin

Parygin

2007

Surface & Interface Analysis

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“…It is important to note that only a minor part of the tested films possessed the LMF emission capability in their pristine, as-grown state. For other samples, this property was developed via a special preliminary treatment by the combined action of temperature and electric field, similar to that previously employed for the activation of nanocarbon film emitters [69]. The thermal-field (TF) treatment procedure optimized for Mo films consisted of the following steps.…”

Section: Emission Propertiesmentioning

confidence: 99%

Low-Field Electron Emission Capability of Thin Films on Flat Silicon Substrates: Experiments with Mo and General Model for Refractory Metals and Carbon

et al. 2021

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Herein, we describe a study of the phenomenon of field-induced electron emission from thin films deposited on flat Si substrates. Films of Mo with an effective thickness of 6–10 nm showed room-temperature low-field emissivity; a 100 nA current was extracted at macroscopic field magnitudes as low as 1.4–3.7 V/μm. This result was achieved after formation treatment of the samples by combined action of elevated temperatures (100–600 °C) and the electric field. Morphology of the films was assessed by AFM, SEM, and STM/STS methods before and after the emission tests. The images showed that forming treatment and emission experiments resulted in the appearance of numerous defects at the initially continuous and smooth films; in some regions, the Mo layer was found to consist of separate nanosized islets. Film structure reconstruction (dewetting) was apparently induced by emission-related factors, such as local heating and/or ion irradiation. These results were compared with our previous data obtained in experiments with carbon islet films of similar average thickness deposited onto identical substrates. On this basis, we suggest a novel model of emission mechanism that might be common for thin films of carbon and refractory metals. The model combines elements of the well-known patch field, multiple barriers, and thermoelectric models of low-macroscopic-field electron emission from electrically nanostructured heterogeneous materials.

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Emissivity of powders prepared from nanoporous carbon

Cited by 14 publications

References 11 publications

Field‐Induced Electron Emission from Nanoporous Carbons

Field‐Induced Electron Emission from Nanoporous Carbons

Hysteresis of pulsed characteristics of field emission from nanocarbon materials

Low-Field Electron Emission Capability of Thin Films on Flat Silicon Substrates: Experiments with Mo and General Model for Refractory Metals and Carbon

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