Combined effect of nitrogen doping and nanosteps on microcrystalline diamond films for improvement of field emission

Mengui, U. A.; Campos, Raonei Alves; Alves, Kenya Aparecida; Antunes, E.F.; Hamanaka, Marcos Henrique Mamoru Otsuka; Corat, Evaldo José; Baldan, Maurício Ribeiro

doi:10.1016/j.apsusc.2014.10.109

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…It should be noted that the most of reports are focused on the study of electrical properties of N-doped diamond films [13][14][15][16]. Nevertheless, there are separate works dedicated to improving the performance of diamond-coated cutting tools due to their doping with nitrogen [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Properties of ultrananocrystalline diamond grown under different deposition conditions

Gaydaychuk¹,

Линник²,

Mitulinsky³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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The influence of CH4 and N2 concentration in CH4/H2/N2gas mixture on microstructure and mechanical properties of diamond films is investigated. Nitrogen addition to the gas mixture up to 18.5 vol. % does not significantly affect the structure of the coating. In the entire range of gas concentrations, coating structure is represented by a set of dendrites consisting of diamond crystallites of various sizes, as well as non-diamond carbon. It is shown that CH4 has a greater effect on the coating hardness and Young's modulus. Besides, it has been found that nitrogen-doped diamond coatings have a higher level of tensile residual stress. With a decrease in coating thickness or nitrogen concentration in the gas mixture, this difference decreases.

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Section: Introductionmentioning

confidence: 99%

Properties of ultrananocrystalline diamond grown under different deposition conditions

Gaydaychuk¹,

Линник²,

Mitulinsky³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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“…2) In particular, a nanocrystalline diamond (NCD) film has been shown to possess higher emission performance than single and microcrystalline diamond films. [3][4][5] An NCD film consists of diamond nanocrystallites embedded in amorphous carbon matrix and is deposited the most widely by moderate-pressure microwave plasma-enhanced chemical vapor deposition (CVD) using hydrocarbon gases such as methane and acetylene highly diluted with Ar. 6) The introduction of Ar enhances dissociation of hydrocarbons into small fragments and recombination of these fragments followed by strong optical emissions of C 2 dimer species.…”

Section: Introductionmentioning

confidence: 99%

Formation of nanocrystalline diamond cones by reactive ion etching in microwave plasma for enhancing field emission

Ota¹,

Kato²,

Teii³

2018

Jpn. J. Appl. Phys.

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Cone-like nanostructures are formed on nitrogen-incorporated nanocrystalline diamond films by reactive ion etching (RIE) in a moderate-pressure microwave plasma. A thin Au layer is deposited on the film and followed by heating for transformation of an Au layer into Au nanoparticles as the mask for RIE. The diameter and spacing of Au nanoparticles depend upon the heating temperature and the thickness of Au. The smooth film surface is transformed into a number of cone-like protrusions with diameters, heights, and spacings of tens to a few hundreds of nm by RIE in a hydrogen/argon plasma and removal of Au residue in aqua regia. The formation of sharp nanostructures enhances field emission characteristics, so that the current density at high fields is increased largely up to the order of 10 −3 A cm −2 and the turn-on field is reduced down to around

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“…10 This effect is enhanced when nitrogen is incorporated into the film to create n-type conduction because of introduction of nitrogenrelated defect levels [11][12][13] and thus favorable for increasing emission performance. [14][15][16] For the application of field emission sources to ion engine and tether propulsion for operation in low earth orbits at altitudes of several hundred kilometers, one of the potential problems of carbonbased materials is a low resistance to oxidation. This is because a large number of oxygen atoms are produced from oxygen molecules by photo-dissociation.…”

mentioning

confidence: 99%

Field Emission Characteristics of Metal-Coated Nanocrystalline Diamond Films

Ota

Kaneko

Terada

et al. 2018

ECS J. Solid State Sci. Technol.

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Effect of thin metal coatings in nanoscale on field emission characteristics of nitrogen-incorporated nanocrystalline diamond films is examined with different metal species and thicknesses. The films show minimal change in surface morphology by coating a thin layer of Ag, Au, and In and consist of fine grains with sizes ranging from 10 to 20 nm depending upon the metal species and thickness. While the emission turn-on field is increased slightly to 3.6 Vμm −1 with very small thicknesses of the metals, it is decreased toward 2.5 Vμm −1 typical of a non-coated film with increasing thickness of the metals up to a few nm. The field enhancement factor related to the surface morphology of the films gives stronger effects on emission performance than the effective barrier height related to the work function of the metals. The Ag-coated film shows higher emission current stability than the non-coated film for duration up to 13 h.

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Combined effect of nitrogen doping and nanosteps on microcrystalline diamond films for improvement of field emission

Cited by 6 publications

References 22 publications

Properties of ultrananocrystalline diamond grown under different deposition conditions

Properties of ultrananocrystalline diamond grown under different deposition conditions

Formation of nanocrystalline diamond cones by reactive ion etching in microwave plasma for enhancing field emission

Field Emission Characteristics of Metal-Coated Nanocrystalline Diamond Films

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