Hydrogen plasma and atomic oxygen treatments of diamond: Chemical versus morphological effects

Shpilman, Z.; Gouzman, I.; Grossman, Eitan; Akhvlediani, R.; Hoffman, A.

doi:10.1063/1.2939561

Cited by 17 publications

(12 citation statements)

References 29 publications

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“…As can be seen, grains become more organized and smaller in size after plasma treatment. The effect of MW‐H plasma on the surface morphology of diamond films has been recently reported by our group 8. There we showed that hydrogen plasma selectively etches the non‐diamond carbon phase.…”

Section: Resultssupporting

confidence: 74%

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Planarization of natural single crystal diamond polishing lines by microwave hydrogen plasma

Gaisinskaya

Edrei

Hoffman

et al. 2009

Physica Status Solidi (a)

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The effect of microwave hydrogenated (MW-H) plasma exposure on the morphology of mechanically polished natural single crystal (100) oriented diamond type 2a surfaces is reported. It is shown that the surface morphology is very sensitive to plasma power and exposure time. Under appropriate plasma exposure conditions the diamond surfaces smooth out as reflected in the decrease in the number and depth of the polishing lines. A systematic study of the influence of hydrogen MW plasma power and exposure time on the diamond surface morphology is presented. The morphology of the diamond surfaces at the different stages was monitored with sub-nanometric resolution by atomic force microscopy and scanning electron spectroscopy.

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Section: Resultssupporting

confidence: 74%

“…Recently, several researches have shown that hydrogen plasma treatment improves the surface flatness and smoothes polishing scratches on diamond surfaces 1–11. Overall these studies show that exposure of diamond surfaces to hydrogen plasma at appropriate conditions may result in smoothing of these surfaces.…”

Section: Introductionmentioning

confidence: 67%

Planarization of natural single crystal diamond polishing lines by microwave hydrogen plasma

Gaisinskaya

Edrei

Hoffman

et al. 2009

Physica Status Solidi (a)

Self Cite

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“…The hitherto reports on the impact of hydrogen treatment on the diamond layer surface structure have been inconsistent. On the one hand, Shpilman et al [ 26 ] have observed that the exposure of polycrystalline CVD diamonds to MW hydrogen plasma results in preferential etching of nondiamond carbon phases and formation of sp 3 -C–H - terminated surface. The authors of [ 23 ] have reported initial increase in the surface roughness with the time of plasma treatment but, for the longest time of hydrogen treatment application, they observed a decrease in this parameter.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Surface Treatment on Structural Properties of CVD Diamond Layers with Different Grain Sizes Studied by Raman Spectroscopy

et al. 2021

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Extensive Raman spectroscopy studies combined with scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) measurements were performed to investigate structural and chemical changes in diamond layers deposited by chemical vapour deposition (CVD) upon post-growth treatment with hydrogen. The aim of this study is to characterize the changes in micro-structural properties of diamond layers with different grain sizes and different contents of sp2 carbon phase. Hydrogenation or oxidization of diamond layer surface is often performed to modify its properties; however, it can also strongly affect the surface structure. In this study, the impact of hydrogenation on the structure of diamond layer surface and its chemical composition is investigated. Owing to their polycrystalline nature, the structural properties of CVD diamond layers can strongly differ within the same layer. Therefore, in this project, in order to compare the results before and after hydrogen treatment, the diamond layers are subjected to Raman spectroscopy studies in the vicinity of a T-shape marker fabricated on the surface of each diamond layer studied.

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“…In the hot plasma zone, the oxygencontaining gas possibly evaporates and ionizes and then involves in CNPs formation resulting in more defect sites by oxygen atoms giving amorphous carbon. Meanwhile, as presented in this study, when toluene was used as medium in liquid arc discharge, only hydrogen plasma was supposedly involved, resulted in selective etching of carbon facets, and terminated as sp 3 −C−H species 53) .…”

Section: Identified Peaks Cnps-a Cnps-b Cnps-c Cnps-d 2ɵ (°) B (˚) D mentioning

confidence: 73%

The Structural Characteristics of Carbon Nanoparticles Produced by Arc Discharge in Toluene Without Added Catalyst or Gases

Andhika¹,

Saraswati²,

Hastuti³

2020

Evergreen

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Carbon nanoparticles (CNPs) have been intensively explored due to their wide applications. One of the cost-effective synthesis techniques is arc discharge in liquid, which produces various carbon nanostructures depending on environmental conditions such as catalyst and gases. The use of organic compound, e.g., toluene, acts as a carbon source for carbon nanoparticle growth. However, the carbon structure examinations of the CNPs product deposited in different spots produced by arc discharge in toluene without added catalyst and gases have not been studied in detail. Therefore, the present study investigates the structural characteristics of CNPs produced by arc discharge in pure toluene using Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy equipped by electron dispersive spectroscopy (SEM-EDS) transmission electron microscope (TEM) imaging data. The nanoparticles were collected by scraping powder from four different spots: the electrode handles; the space between the electrodes; in the liquid medium; and at the bottom of the reaction chamber. The C(002) peak analyzed in the diffraction pattern of CNPs collected in these locations shows different intensities and features. The CNPs formed between the electrodes had the most crystalline graphitic structures. The Fourier transform infrared (FTIR) spectra show differences in the C−H absorption, especially for CNPs dissolved in toluene, suggested contains fullerene and its organic hydrocarbon fragments. Moreover, a Raman analysis shows significant differences between the CNPs deposited between the electrodes and those collected from the bottom of the glass chamber, which validates the FTIR, XRD, and TEM imaging data. The powder deposited between the electrodes seems to take the form of CNPs with better graphitic structures; meanwhile, powder collected from the other spots were analyzed to be hydrogenated diamond-like carbon and glassy bulk carbon.

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Hydrogen plasma and atomic oxygen treatments of diamond: Chemical versus morphological effects

Cited by 17 publications

References 29 publications

Planarization of natural single crystal diamond polishing lines by microwave hydrogen plasma

Planarization of natural single crystal diamond polishing lines by microwave hydrogen plasma

The Effect of Surface Treatment on Structural Properties of CVD Diamond Layers with Different Grain Sizes Studied by Raman Spectroscopy

The Structural Characteristics of Carbon Nanoparticles Produced by Arc Discharge in Toluene Without Added Catalyst or Gases

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