Columnar CVD diamond growth structure on irregular surface substrates

Trava-Airoldi, V.J.; Corat, Evaldo José; Peña, Angel Fidel Vilche; Leite, N. F.; Baranauskas, Vı́tor; Salvadori, M. C.

doi:10.1016/0925-9635(95)00308-8

Cited by 27 publications

(10 citation statements)

References 7 publications

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“…A slightly columnar structure normal to the diamond film surface can also be observed, as registered before by Ref. 24. It is also clear that the back of the membrane ͑the diamond nucleation surface͒ is much smoother than the growth side, and it conforms to the original silicon surface.…”

Section: Resultssupporting

confidence: 78%

Investigation of the electron emission from pores in a diamond porous membrane

Mammana

Anders

Monteiro

et al. 2000

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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It was previously proposed that porous diamond membranes can be used as field emission arrays. As main features of such a device, we identified a field enhancement factor equivalent or superior to that of a metal edge emitter, allied to a higher vacuum conductance. Emitting membrane prototypes were built and tested. These showed promising emission performance. In this work we continue the membrane pore characterization from a geometric point of view. We also present photoemission electron microscopy images from the emitting area around a pore. These images show that indeed there is enhanced electron emission occurring in that region. Current versus time and current versus field graphs complete the emission characterization.

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Section: Resultssupporting

confidence: 78%

Investigation of the electron emission from pores in a diamond porous membrane

Mammana

Anders

Monteiro

et al. 2000

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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“…The appearance of a band around 500 cm -1 is also observed, attributed to the vibration of boron pairs in diamond lattice. For electrode E2, its better quality is confirmed by the complete absence of the sharp peaks around 1580 cm -1 , compared to that for electrode E1 (25) . As the sp 2 phase is found at the grain boundary, the largest grain of E2 led to the lowest contribution of the sp 2 phase when the same area is exposed to the Raman laser for both electrodes.…”

Section: Morphological and Structural Characterization Of Diamond Elementioning

confidence: 67%

“…2 insets). This grain size increase is associated with the decrease in the nucleation density as a function of the deposition time, where the steady state took place with the dominant columnar growth (25) . Furthermore, a set of processes may occur during the deposition, including the disappearance of some crystals by etching or decomposition processes (26) .…”

Section: Morphological and Structural Characterization Of Diamond Elementioning

confidence: 99%

“…Furthermore, a set of processes may occur during the deposition, including the disappearance of some crystals by etching or decomposition processes (26) . Particularly, the process for microcrystalline diamond follows the columnar type of growth, i.e., the first layers of the film grains grow very fast up until the process of nuclei coalescence takes place, which exhibits crystallinity due to the random nature of polycrystalline and non-oriented film (25) . An earlier paper of CVD diamond growth on silicon has shown that for a film thickness up to 3.0 µm the steady state is established with the declining competitiveness of crystal orientation and also the stresses generated by the intrinsic surface accommodation.…”

Section: Morphological and Structural Characterization Of Diamond Elementioning

confidence: 99%

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Optimization of a promising technology to degrade the persistent azo-dye (RO16) using boron doped diamond electrodes

Migliorini¹,

Alegre²,

Alves³

et al. 2014

RBAV

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The electrochemical degradation of the reactive orange 16 azo-dye (RO16) using boron doped diamond (BDD) electrodes grown on titanium substrate (BDD/Ti) is presented. Two different electrodes, produced at growth times of 7 and 24 h, were used and named as E1 and E2, respectively. Both of them are highly doped, with the acceptor concentration of around 7.0 x 10 20 cm -3 , evaluated by the Raman spectra. The morphological and the physical characterization confirmed the best diamond purity of E2 electrode associated with its largest and well faceted grains as well as with its lowest sp 2 content. This behavior was attributed to the diamond columnar growth dominance after the stead state process, observed for the films with a thickness higher than 3.0 mm. The electrode efficiencies were studied to degrade electrochemically the RO16 dye. The results were analyzed by UV/VIS spectroscopy, by total organic carbon (TOC) and by high-performance liquid chromatography (HPLC) techniques. The electrode E2 showed the best efficiency for both, the aromaticity reduction and the azo group fracture, from UV/VIS spectra. These tendencies were confirmed by the TOC and the chromatographic measurements. The direct relationships among the BDD morphology, physical property, and performance during the degradation process were discussed.Keywords: Electrochemical oxidation; Reactive orange 16 dye; Boron doped diamond. Resumo É apresentada neste trabalho a degradação eletroquímica do corante Reativo alaranjado 16 (RO16) utilizando eletrodos de diamante dopado com boro sobre substrato de titânio (BDD/Ti). Dois eletrodos diferentes, produzidos com tempo de crescimento de 7 e 24 h, foram utilizados e denominados como

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“…It is found that the position of the (111) peaks downshifts with increasing boron doping quantity, which indicates an expansion of the lattice parameter induced by boron incorporation in the impurity bond of boron [26][27][28][29][30]. Figure 11 shows cyclic voltammograms of a platinum and BDD electrodes [31][32][33][34] with B/C ratios 0.3, 0.5, and 2.0% in 0.2 M KNO 3 . It was found that the potential window of BDD electrodes is clearly the widest in comparison with that of the conventional Pt material.…”

Section: B Growth Rate Of Boron-doped Diamond Filmsmentioning

confidence: 99%

Growth Rate and Electrochemical Properties of Boron-Doped Diamond Films Prepared by Hot-Filament Chemical Vapor Deposition Methods

Nagasaka

Teranishi

Kondo

et al. 2016

e-J. Surf. Sci. Nanotech.

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Boron-doped diamond (BDD) films have good electrochemical performance with a wide potential window and chemical stability in aqueous solutions, compared with other electrode materials made of Pt, glassy carbon, and so forth. BDD electrodes have been investigated for various industrial applications, such as ozone-dissolved water and effluent water treatment. In this study, to achieve a high synthesis rate of BDD films, trimethyl borate was additionally introduced to a hot-filament chemical vapor deposition (HF-CVD) system as a reactant gas. It was found that the growth rate and quality of diamond prepared using the HF-CVD system depended on the effect of CH4 concentration on hydrogen, distance from filament to substrate, and supply B/C ratios. BDD films with a high growth rate in the range from 2 to 4 µm/h have been obtained at a filament-to-substrate distance of 5 mm, a CH4 concentration of 4%, and B/C ratios of 0.3-2.0%. Cyclic voltammograms of a Pt and BDD electrodes in 0.2 M KNO3 have been investigated in terms of the effect of supply B/C ratios of 0.3, 0.5, and 2.0%. It was found that BDD electrodes had a wide potential window and a low background current compared with conventional Pt electrodes. The BDD films prepared and characterized in this study are efficient as electrodes for environmental applications.

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Columnar CVD diamond growth structure on irregular surface substrates

Cited by 27 publications

References 7 publications

Investigation of the electron emission from pores in a diamond porous membrane

Investigation of the electron emission from pores in a diamond porous membrane

Optimization of a promising technology to degrade the persistent azo-dye (RO16) using boron doped diamond electrodes

Growth Rate and Electrochemical Properties of Boron-Doped Diamond Films Prepared by Hot-Filament Chemical Vapor Deposition Methods

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