Diamond nucleation on graphite substrate using a pure hydrogen feed

Chow, Lee; Wang, Hao; Kleckley, Stephen; Schulte, Alfons; Casey, K.J.

doi:10.1016/0038-1098(94)00889-2

Cited by 14 publications

(4 citation statements)

References 19 publications

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“…from the plasma ball. 19 Therefore, the carbon atoms would fill up the gaps of the graphite substrate, which was the reason that the TC was enhanced. Comparing with other general thermal materials, such as copper (397 W m − 1 k − 1 ) and aluminium (240 W m − 1 k − 1 ), the diamond film coated on graphite substrate would be more excellent for use as thermal conductive products.…”

Section: Resultsmentioning

confidence: 99%

High thermal conductivity diamond coated graphite by microwave plasma chemical vapour deposition

Lyu

Bai

et al. 2015

Materials Science and Technology

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Diamond film was grown on high thermal conductivity graphite substrate using microwave plasma chemical vapour deposition method. Nanodiamond particles were uniformly seeded on the substrate to generate high nucleation density by a spray gun. The continuous and high purity diamond film was obtained, and growth rate was up to 2.7 μm h− 1. The thickness, surface morphology, quality and composite phase of the film were analysed by SEM, Raman and X-ray diffraction. It was shown that graphite coated with diamond presented a higher thermal conductivity (520 W m− 1 k− 1) than copper. Furthermore, this coated material with high thermal conductivity, good strength and non-conductive surface will make it possible to be widely used in thermal management field.

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Section: Resultsmentioning

confidence: 99%

High thermal conductivity diamond coated graphite by microwave plasma chemical vapour deposition

Lyu

Bai

et al. 2015

Materials Science and Technology

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“…Particularly, the carbon substrate tends to act as a carbon source and change the hydrocarbon/hydrogen ratio. Several papers have shown that it is possible to produce diamond through hydrogen etching of a solid carbon source [8][9][10][11]. Oxygen may also influence the chemical reactions leading to the consumption of some carbon species that reduce the diamond growth rate [12] or even may removes non-diamond carbon [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of modified carbon substrate on boron doped ultrananocrystalline diamond deposition

Oishi

Silva

Botelho

et al. 2018

Mater. Res. Express

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Boron doped ultrananocrystalline diamond (B-UNCD) growth was studied on modified reticulated vitreous carbon (RVC) produced from poly(furfuryl alcohol) (PFA) resin with sodium hydroxide additions at two different heat treatment temperatures. The different amounts of NaOH in PFA (up to reaching pH values of around 3, 5, 7, and 9) aimed to neutralize the acid catalyst and to increase the PFA storage life. Besides, this procedure was responsible for increasing the oxygen content of RVC samples. Thus, the effect of carbon and oxygen coming from the substrates in addition to their different graphitization indexes on diamond morphology, grain size, preferential growth and boron doping level were investigated by FEG-SEM, x-ray diffraction and Raman spectroscopy. Therefore, B-UNCD films were successfully grown on RVC with pH values of 3, 5, 7, and 9 heat treated at 1000 and 1700°C. Nonetheless, the higher oxygen amount during B-UNCD growth for samples with pH 7 and 9 heat treated at 1000°C was responsible for the RVC surface etching and the decrease in the boron concentration of such samples. The cross section images showed that B-UNCD infiltrated at around 0.9 mm in depth of RVC samples while carbon nanowalls were observed mainly on RVC samples heat treated at 1000°C for all pH range studied.

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“…Otherwise, there are some authors in the literature that have already produced diamond without using hydrocarbon in the gas inlet. Chow et al (6) have demonstrated that the chemical reaction products in the atomic hydrogen--graphite reaction can be used as an efficient starting material for diamond growth. Yang et al (7) have found high growth rate of high quality diamond through graphite etching using different setups for graphite and substrate inside the reactor.…”

Section: Introductionmentioning

confidence: 99%

Phonon confinement model applied on the Raman spectra of CVD diamond films grown through graphite etching

Ramos¹,

Silva²,

Abramof³

et al. 2014

RBAV

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Os filmes de nanodiamante sintetizados em condições experimentais específicas, tais como a concentração de metano, hidrogênio e argônio, e ainda temperatura, possuem um grande número de aplicações, principalmente em eletroquímica, devido a sua condutividade elétrica fortemente influenciada pelo composto transpoliacetileno que traz o dímero C 2 em sua estrutura o qual apresenta ligações do tipo π e a alternância entre os estados ligados e não ligados desta, influencia sobremaneira no valor do GAP do filme. Devido a esta e outras propriedades do nanodiamante caracterizá-los se tornou muito importante. Utilizando a técnica de crescimento por filamento quente e a caracterização por espectroscopia Raman, pode-se avaliar a redução nos tamanhos dos grãos em escala nanométrica com a aplicação do modelo de confinamento de fônons[1], baseado no fato que, num cristal infinito, somente fônons próximos ao centro da zona Brillouin (q≈0) contribuem para o espectro Raman devido a conservação do momento entre os fônons e a luz incidente. Istoé, num cristal finito, fônons podem estar confinados num espaço pelos contornos do cristal ou defeitos. Isto resulta na incerteza do momento, permitindo que fônons com q =0 contribuam com o espectro Raman. O modelo avalia o alargamento do pico em 1332 cm −1 correspondente ao pico do diamante e a identificação do nanocristalé avaliada pelo par de bandas em torno de 1150 cm −1 e 1480 cm −1 , também considerados como característica do composto transpoliacetileno presente nos contornos dos grãos e na superfície dos filmes de diamante nanocristalino. Ainda, pode-se calcular efeitos de tensões induzidas no filme através de um deslocamento observados durante análise comparativa do espectro do modelo e os dados experimentais.[1] Richter, H.; Wang, Z.P.; Ley, L.. The one phonon Raman spectrum in microcrystalline silicon. Solid State Communications, v. 39, p. 625-629, 1981.

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Diamond nucleation on graphite substrate using a pure hydrogen feed

Cited by 14 publications

References 19 publications

High thermal conductivity diamond coated graphite by microwave plasma chemical vapour deposition

High thermal conductivity diamond coated graphite by microwave plasma chemical vapour deposition

Influence of modified carbon substrate on boron doped ultrananocrystalline diamond deposition

Phonon confinement model applied on the Raman spectra of CVD diamond films grown through graphite etching

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