Development of a High-Beam-Transparency Gridded Electron Gun Based on a Carbon Nanotube Cold Cathode

Chen, Qing‐Yun; Yuan, Xuesong; Xu, Xiaotao; Zhang, Yu; Cole, Matthew T.; Zu, Yifan; Chen, Zexiang; Yin, Yong; Li, Hailong; Meng, Lin; Yan, Yang

doi:10.1109/led.2022.3151714

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…Together with the unique thermal and mechanical properties, this makes it possible to use them as additives to improve the characteristics of piezoresistive elements [17,18], solar energy converters [19], conductive and biocompatible polymers [20][21][22], and energy storage devices [23]. One of the promising applications of CNT is the creation of electronic devices with CNT cathodes as electron sources with a low threshold voltage of field emission cathodes [24][25][26]. Graphene and its derivatives are also widely used in the creation of electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Carbon Nanotubes–Graphene Nanostructures: Modeling, Formation, Characterization

et al. 2022

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A technology for the formation and bonding with a substrate of hybrid carbon nanostructures from single-walled carbon nanotubes (SWCNT) and reduced graphene oxide (rGO) by laser radiation is proposed. Molecular dynamics modeling by the real-time time-dependent density functional tight-binding (TD-DFTB) method made it possible to reveal the mechanism of field emission centers formation in carbon nanostructures layers. Laser radiation stimulates the formation of graphene-nanotube covalent contacts and also induces a dipole moment of hybrid nanostructures, which ensures their orientation along the force lines of the radiation field. The main mechanical and emission characteristics of the formed hybrid nanostructures were determined. By Raman spectroscopy, the effect of laser radiation energy on the defectiveness of all types of layers formed from nanostructures was determined. Laser exposure increased the hardness of all samples more than twice. Maximum hardness was obtained for hybrid nanostructure with a buffer layer (bl) of rGO and the main layer of SWCNT—rGO(bl)-SWCNT and was 54.4 GPa. In addition, the adhesion of rGO to the substrate and electron transport between the substrate and rGO(bl)-SWCNT increased. The rGO(bl)-SWCNT cathode with an area of ~1 mm2 showed a field emission current density of 562 mA/cm2 and stability for 9 h at a current of 1 mA. The developed technology for the formation of hybrid nanostructures can be used both to create high-performance and stable field emission cathodes and in other applications where nanomaterials coating with good adhesion, strength, and electrical conductivity is required.

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