All-carbon heterostructures self-assembly during field electron emission from diamond nanotip

Kleshch, Victor I.; Orekhov, Anton S.; Pishchulina, Alexandra E.; Sapkov, Ivan V.; Khmelenin, Dmitry N.; Loginov, Artem B.; Ismagilov, Rinat R.; Obraztsov, Alexander N.

doi:10.1016/j.carbon.2024.118936

Carbon

2024

DOI: 10.1016/j.carbon.2024.118936

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All-carbon heterostructures self-assembly during field electron emission from diamond nanotip

Victor I. Kleshch,

Anton S. Orekhov,

Alexandra E. Pishchulina

et al.

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2024

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Cited by 2 publications

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Field emission from cylindrical graphene cathodes prepared by chemical vapor deposition and cold rolling

Hernandez,

Piovesan Azambuja,

Cahay

et al. 2024

Journal of Applied Physics

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We report field emission (FE) properties of cold cathodes made by a scalable chemical vapor deposition synthesis of three-dimensional graphene (3DG) from a cast catalyst followed by cold rolling. This process leads to an increase in mechanical strength and electrical conductivity of the tested material. For a given distance between the tip of the cathode and the anode, it is found that the FE current from the edge of a single sheet of cold-rolled 3DG-based cathode can be increased by over one order of magnitude when rolling the 3DG sheet in the shape of a cylinder with several turns. A FE current in the order of 4.5 mA was measured from a 3 mm diameter cold-rolled 3DG cylinder with six turns at a bias of 2400 V for a separation of 0.5 mm between the tip of the cylindrical cathode and the anode. The FE data of all cold-rolled 3DG-based cathodes are well fitted by the expression proposed by Abbot, Henderson, Forbes, and Popov [Filippov et al., R. Soc. Open Sci. 9, 220748 (2022)], Im=CVmκexp(−B/Vm), where Im is the FE current, Vm is the bias applied between the cathode and anode, and B and C are fitting parameters. It is found that κ=1 and 3/2 for FE from the surface and edge of the cold-rolled based cathodes, respectively.

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Field emission from cylindrical graphene cathodes prepared by chemical vapor deposition and cold rolling

Hernandez,

Piovesan Azambuja,

Cahay

et al. 2024

Journal of Applied Physics

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Synthesis and Mechanism Study of Carbon Nanowires, Carbon Nanotubes, and Carbon Pompons on Single-Crystal Diamonds

Wu,

Wang,

Guo

et al. 2024

Crystals

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Carbon nanomaterials are in high demand owing to their exceptional physical and chemical properties. This study employed a mixture of CH4, H2, and N2 to create carbon nanostructures on a single-crystal diamond using microwave plasma chemical vapor deposition (MPCVD) under high-power conditions. By controlling the substrate surface and nitrogen flow rate, carbon nanowires, carbon nanotubes, and carbon pompons could be selectively deposited. The results obtained from OES, SEM, TEM, and Raman spectroscopy revealed that the nitrogen flow rate and substrate surface conditions were crucial for the growth of carbon nanostructures. The changes in the plasma shape enhanced the etching effect, promoting the growth of carbon pompons. The CN and C2 groups play vital catalytic roles in the formation of carbon nanotubes and nanowires, guiding the precipitation and composite growth of carbon atoms at the interface between the Mo metal catalysts and diamond. This study demonstrated that heterostructures of diamond–carbon nanomaterials could be produced under high-power conditions, offering a new approach to integrating diamond and carbon nanomaterials.

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All-carbon heterostructures self-assembly during field electron emission from diamond nanotip

Cited by 2 publications

References 41 publications

Field emission from cylindrical graphene cathodes prepared by chemical vapor deposition and cold rolling

Field emission from cylindrical graphene cathodes prepared by chemical vapor deposition and cold rolling

Synthesis and Mechanism Study of Carbon Nanowires, Carbon Nanotubes, and Carbon Pompons on Single-Crystal Diamonds

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