Nano- and micro-crystalline diamond growth by MPCVD in extremely poor hydrogen uniform plasmas

Fernandes, A.J.S.; Neto, M.A.; Almeida, F.A.; Silva, Rui; Costa, F.M.

doi:10.1016/j.diamond.2006.12.029

Cited by 31 publications

(17 citation statements)

References 19 publications

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“…into two sub-bands, one at 1475 cm -1 and the other at about 1550 cm -1 , both identified by peak fitting, assigned to trans-polyacetylene (TPA), and the G band of graphitic materials [21], respectively. The weak band visible at 1140 cm -1 appearing in samples grown at higher power (3.5 kW and 4.0 kW) with slightly higher amounts of N 2 , confirm the presence of TPA at the grain boundaries, together with the 1475 cm -1 band [22]. It is worth to note that TPA is not intrinsic to diamond, but has been commonly found as a non-diamond impurity phase coexisting in most NCD films grown by CVD methods.…”

Section: Methodssupporting

confidence: 59%

High rate growth of nanocrystalline diamond films using high microwave power and pure nitrogen/methane/hydrogen plasma

Tang

Fernandes

Granada

et al. 2015

Vacuum

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Section: Methodssupporting

confidence: 59%

High rate growth of nanocrystalline diamond films using high microwave power and pure nitrogen/methane/hydrogen plasma

Tang

Fernandes

Granada

et al. 2015

Vacuum

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“…The 1140 and 1480 cm −1 shoulders, usually attributed to trans‐polyacetylene, are an indirect proof of the presence of NCD 28, 29. A band at 1228 cm −1 is also visible that appeared to be conjugated with vibration modes of C‐H chains characteristic of nano‐ and ultrananocrystalline diamond 30. Furthermore, it is also visible the 1332 cm −1 diamond band as well as the D (1360 cm −1 ) and G (1560 cm −1 ) graphite bands.…”

Section: Resultsmentioning

confidence: 95%

Nanocrystalline diamond: In vitro biocompatibility assessment by MG63 and human bone marrow cells cultures

Amaral¹,

Dias²,

Gomes³

et al. 2007

J Biomedical Materials Res

124

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Nanocrystalline diamond (NCD) has a great potential for prosthetic implants coating. Nevertheless, its biocompatibility still has to be better understood. To do so, we employed several materials characterization techniques (SEM, AFM, micro-Raman spectroscopy) and cell culture assays using MG63 osteoblast-like and human bone marrow cells. Biochemical routines (MTT assays, Lowry's method, ALP activity) supported by SEM and confocal microscopy characterization were carried out. We used silicon nitride (Si3N4) substrates for NCD coatings based on a previous demonstration of the superior adhesion and tribological performance of these NCD coated ceramics. Results demonstrate an improved human osteoblast proliferation and the stimulation of differentiated markers, like ALP activity and matrix mineralization, compared with standard polystyrene tissue culture plates. The nanometric featuring of NCD, associated to its chemical affinity are key points for bone regeneration purposes.

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“…The characteristics of diamond is present at 1332 cm −1 . 17,19 Three peaks at 1130, 1192, and 1458 cm −1 derive from the nanocrystals, 19,20 which is induced by the C−H bonds at grain boundaries of nanocrystals. All the nanotwins are along the same orientation, reaching a length to several micrometers.…”

mentioning

confidence: 99%

In Situ TEM Study of Interaction between Dislocations and a Single Nanotwin under Nanoindentation

Wang

Zhang²,

Cui

et al. 2017

ACS Appl. Mater. Interfaces

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Nanotwinned (nt) materials exhibit excellent mechanical properties, and have been attracting much more attention of late. Nevertheless, the fundamental mechanism of interaction between dislocations and a single nanotwin is not understood. In this study, in situ transmission electron microscopy (TEM) nanoindentation is performed, on a specimen of a nickel (Ni) alloy containing a single nanotwin of 89 nm in thickness. The specimen is prepared using focused ion beam (FIB) technique from an nt surface, which is formed by a novel approach under indentation using a developed diamond panel with tips array. The stiffness of the specimen is ten times that of the pristine counterparts during loading. The ultrahigh stiffness is attributed to the generation of nanotwins and the impediment of the single twin to the dislocations. Two peak loads are induced by the activation of a new slip system and the penetration of dislocations over the single nanotwin, respectively. One slip band is parallel to the single nanotwin, indicating the slip of dislocations along the nanotwin. In situ TEM observation of nanoindentation reveals a new insight for the interaction between dislocations and a single nanotwin. This paves the way for design and preparation of high-performance nt surfaces of Ni alloys used for aircraft engines, gas turbines, turbocharger components, ducts, and absorbers.

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Nano- and micro-crystalline diamond growth by MPCVD in extremely poor hydrogen uniform plasmas

Cited by 31 publications

References 19 publications

High rate growth of nanocrystalline diamond films using high microwave power and pure nitrogen/methane/hydrogen plasma

High rate growth of nanocrystalline diamond films using high microwave power and pure nitrogen/methane/hydrogen plasma

Nanocrystalline diamond: In vitro biocompatibility assessment by MG63 and human bone marrow cells cultures

In Situ TEM Study of Interaction between Dislocations and a Single Nanotwin under Nanoindentation

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