Spectroscopic Ellipsometry of Nanocrystalline Diamond Film Growth

Thomas, Evan L. H.; Mandal, Soumen; Ashek-I-Ahmed,; MacDonald, John Emyr; Dane, Thomas G.; Rawle, Jonathan; Cheng, Chia‐Liang; Williams, Oliver A.

doi:10.1021/acsomega.7b00866

Cited by 20 publications

(23 citation statements)

References 65 publications

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“…Above 2% CH 4 (3, 5 and 6%) the layer was completely uniform, and the crystallite density was not changing, which was the sign of surface reaction limited growth. At this stage, the growth mode was a combination of island growth (Volmer-Weber mode) and layer growth (Frank-van der Merwe mode) [37]. The uniform distribution of diamond grains with a negligible size variation was a confirmation of the uniformity in seeding and nucleation prior to growth.…”

Section: Grain Size and Thicknessmentioning

confidence: 87%

A Study on the Growth Window of Polycrystalline Diamond on Si3N4-coated N-Polar GaN

2019

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Diamond has the most desirable thermal properties for applications in electronics. In principle, diamond is the best candidate for integration with other materials for thermal management due to its high thermal conductivity. Therefore, if low thermal boundary resistance can be developed between diamond and the semiconductor material, it would most effectively channel the heat away from areas of high power dissipation. Recent advancement of N-polar GaN in high power RF and conventional power electronics motivated us to study the diamond/Si3N4/GaN interface to understand how effectively the heat can be transferred from the GaN channel to diamond heat-sink. Prior studies showed that there are challenges in incorporating diamond with GaN while still maintaining the high crystalline quality necessary to observe the desirable thermal properties of the material. Therefore, in this study we investigated the influence of methane concentration (0.5–6%), gas pressure (40–90 Torr), sample surface temperature (600–850 °C), and growth duration (1 ~ 5 h) on polycrystalline diamond growth. The diamond/Si3N4/GaN interface looks abrupt with no signs of etching of the GaN for the samples with methane concentration above 2%, pressures up to 90 Torr, and temperatures < 850 °C, allowing for incorporation of diamond close to the active region of the device. This approach contrasts with most prior research, which require surface roughening and thick growth on the backside.

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Section: Grain Size and Thicknessmentioning

confidence: 87%

A Study on the Growth Window of Polycrystalline Diamond on Si3N4-coated N-Polar GaN

2019

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“…Woollam). According to published standard methods [ 47 ], the continuing wavelength ranging from 124 to 1700 nm and selected the angle of incidence of both 65ºand 70º for ellipsometry measurements. We choosed ∆ and Ψ values surveyed at a wavelength of 600–1700 nm for analysis.…”

Section: Methodsmentioning

confidence: 99%

Development of an anti-infective coating on the surface of intraosseous implants responsive to enzymes and bacteria

Liao

et al. 2021

J Nanobiotechnol

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Background Bacterial proliferation on the endosseous implants surface presents a new threat to the using of the bone implants. Unfortunately, there is no effective constructed antibacterial coating which is bacterial anti-adhesion substrate-independent or have long-term biofilm inhibition functions. Methods Drug release effect was tested in Chymotrypsin (CMS) solution and S. aureus. We used bacterial inhibition rate assays and protein leakage experiment to analyze the in vitro antibacterial effect of (Montmorillonite/Poly-l-lysine-Chlorhexidine)10 [(MMT/PLL-CHX)10] multilayer film. We used the CCK-8 assay to analyze the effect of (MMT/PLL-CHX)10 multilayer films on the growth and proliferation of rat osteoblasts. Rat orthopaedic implant-related infections model was constructed to test the antimicrobial activity effect of (MMT/PLL-CHX)10 multilayer films in vivo. Results In this study, the (MMT/PLL-CHX)10 multilayer films structure were progressively degraded and showed well concentration-dependent degradation characteristics following incubation with Staphylococcus aureus and CMS solution. Bacterial inhibition rate assays and protein leakage experiment showed high levels of bactericidal activity. While the CCK-8 analysis proved that the (MMT/PLL-CHX)10 multilayer films possess perfect biocompatibility. It is somewhat encouraging that in the in vivo antibacterial tests, the K-wires coated with (MMT/PLL-CHX)10 multilayer films showed lower infections incidence and inflammation than the unmodified group, and all parameters are close to SHAM group. Conclusion (MMT/PLL-CHX)10 multilayer films provides a potential therapeutic method for orthopaedic implant-related infections.

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“…At this stage, the lateral growth is sufficient for the diamond islands to coalesce and form columnar crystals, which is in accordance with the van der Drift growth model. [46] For the convention microcrystalline diamond, the film grows in a clear columnar way. However, for the ultra-nanocrystalline/ nanocrystalline diamond, re-nucleation occurs after the first nucleation layer, leading again to the formation of diamond islands and subsequent island coalescence.…”

Section: Growth Of Ultrathin Diamond Filmsmentioning

confidence: 99%

Ultrathin Diamond Nanofilms—Development, Challenges, and Applications

Handschuh‐Wang

Wang

Tang

2021

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Diamond is a highly attractive material for ample applications in material science, engineering, chemistry, and biology because of its favorable properties. The advent of conductive diamond coatings and the steady demand for miniaturization in a plethora of economic and scientific fields resulted in the impetus for interdisciplinary research to develop intricate deposition techniques for thin (≤1000 nm) and ultra‐thin (≤100 nm) diamond films on non‐diamond substrates. By virtue of the lowered thickness, diamond coatings feature high optical transparency in UV–IR range. Combined with their semi‐conductivity and mechanical robustness, they are promising candidates for solar cells, optical devices, transparent electrodes, and photochemical applications. In this review, the difficulty of (ultra‐thin) diamond film development and production, introduction of important stepping stones for thin diamond synthesis, and summarization of the main nucleation procedures for diamond film synthesis are elucidated. Thereafter, applications of thin diamond coatings are highlighted with a focus on applications relying on ultrathin diamond coatings, and the excellent properties of the diamond exploited in said applications are discussed, thus guiding the reader and enabling the reader to quickly get acquainted with the research field of ultrathin diamond coatings.

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Spectroscopic Ellipsometry of Nanocrystalline Diamond Film Growth

Cited by 20 publications

References 65 publications

A Study on the Growth Window of Polycrystalline Diamond on Si3N4-coated N-Polar GaN

A Study on the Growth Window of Polycrystalline Diamond on Si3N4-coated N-Polar GaN

Development of an anti-infective coating on the surface of intraosseous implants responsive to enzymes and bacteria

Ultrathin Diamond Nanofilms—Development, Challenges, and Applications

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