The use of carbonaceous materials as field-emission cathodes

Bobkov, A. F.; Davydov, E. V.; Зайцев, С. В.; Karpov, A. V.; Kozodaev, M. A.; Nikolaeva, I. N.; Popov, M. A.; Skorokhodov, E. N.; Суворов, А. Л.; Cheblukov, Yu. N.

doi:10.1134/1.1379644

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…In the case of the CFs-BFO composite, the formation of a p-p junction at the interface between BFO and CFs can be a real factor in improving gas sensing performance. Due to their different work function (WF), electrons are transferred from the BFO material with low WF (ϕ BFO = 4.5 eV) [59] to the CFs material with high WF (ϕ CFs = 4.7 eV) [60]. Thus, it reaches a stable state and forms a new Fermi energy level.…”

Section: Sensing Mechanismmentioning

confidence: 99%

Enhanced volatile organic compound sensing properties of BiFeO3 by carbon fibres addition

Oughanem

Douani

Guhel

et al. 2022

PAC

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In the present work, pure BiFeO3 (BFO) particles were synthesized by sol-gel method and mixed with carbon fibre to form composites (x%CFs-BFO, where x corresponds to 0, 4, 8 and 10 wt.%) by hydrothermal treatment at 150?C. The resulting composite powders were characterized by X-ray diffraction, Raman spectroscopy, nitrogen adsorption/desorption isotherm and scanning electron microscopy (SEM-EDX). The synthesized powders were used for gas sensors preparation by manual deposition of their mixture with polyvinyl alcohol on alumina tubes ending with two silver electrodes. The impedance of the sensitive layers was determined by impedance spectroscopy in the temperature range 100-250?C at different gaseous concentrations. The detection properties of the fabricated sensors for various volatile organic compounds were investigated. The sensors showed better sensitivity to acetone compared to other gases. The addition of carbon fibres improved the sensitivity to acetone vapour from 64 to 135% at 100 ppm and reduced the optimum operating temperature of the sensors by 20?C and the response and recovery times from (26 s/15 s) to (18 s/10 s). This study revealed that x%CFs-BiFeO3 composites are promising candidates for gas sensors.

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Section: Sensing Mechanismmentioning

confidence: 99%

Enhanced volatile organic compound sensing properties of BiFeO3 by carbon fibres addition

Oughanem

Douani

Guhel

et al. 2022

PAC

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“…At present, field emission properties of nanostruc tured carbon films have been studied insufficiently. Nevertheless, a large number of experimental [1][2][3][4][5] and theoretical [6,7] works indicate bright prospects for obtaining high efficiency cathodes based on a nanostructured carbon surface.…”

Section: Introductionmentioning

confidence: 99%

Field electron emission from composite cathodes with a nanostructured surface

Lupekhin

2015

Tech. Phys.

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Field electron emission from composite copper-carbon (Cu-C) cathodes with a nanostructured surface is studied experimentally. The emitting surface of the cathodes is formed by a high voltage vacuum discharge. The morphology and the elemental composition of the emitting surface are analyzed. The cur rent-voltage characteristics are studied at working voltages of 1.8-5.6 kV in anode-cathode gaps of 0.5 mm. It is found that in technical vacuum conditions, the emission current from the Cu-C cathode at such voltages is 5-270 µA.

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Field-Emission Staggered Structure Based on Diamond–Graphite Clusters

Давидович

Yafarov

2018

Tech. Phys.

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The use of carbonaceous materials as field-emission cathodes

Cited by 6 publications

References 10 publications

Enhanced volatile organic compound sensing properties of BiFeO3 by carbon fibres addition

Enhanced volatile organic compound sensing properties of BiFeO3 by carbon fibres addition

Field electron emission from composite cathodes with a nanostructured surface

Field-Emission Staggered Structure Based on Diamond–Graphite Clusters

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