Characterization of diamond nanoplatelets

Chen, Hou Guang; Chang, Li

doi:10.1016/j.diamond.2003.11.013

Cited by 19 publications

(26 citation statements)

References 15 publications

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“…The thicknesses of the nanoplates obtained in the present study are of similar dimension, but they are not (111) planes as shown by Ref. [51]. Very recently, the CVD diamond group at Bristol University published some SEM micrographs of diamond oddities and unusual structures (rod, plate, star or spaghetti like carbon/diamond structures) without confirming their repeatability and standard method of deposition ③ .…”

Section: 3 Diamond Nanostructurementioning

confidence: 76%

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Property mapping of polycrystalline diamond coatings over large area

et al. 2014

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Large-area polycrystalline diamond (PCD) coatings are important for fields such as thermal management, optical windows, tribological moving mechanical assemblies, harsh chemical environments, biological sensors, etc. Microwave plasma chemical vapor deposition (MPCVD) is a standard technique to grow high-quality PCD films over large area due to the absence of contact between the reactive species and the filament or the chamber wall. However, the existence of temperature gradients during growth may compromise the desired uniformity of the final diamond coatings. In the present work, a thick PCD coating was deposited on a 100-mm silicon substrate inside a 915-MHz reactor; the temperature gradient resulted in a non-uniform diamond coating. An attempt was made to relate the local temperature variation during deposition and the different properties of the final coating. It was found that there was large instability inside the system, in terms of substrate temperature (as high as ΔT = 212 ℃), that resulted in a large dispersion of the diamond coating's final properties: residual stress (15.8 GPa to +6.2 GPa), surface morphology (octahedral pyramids with (111) planes to cubo-octahedrals with (100) flat top surfaces), thickness (190 µm to 245 µm), columnar growth of diamond (with appearance of variety of nanostructures), nucleation side hardness (17 GPa to 48 GPa), quality (Raman peak FWHM varying from 5.1 cm 1 to 12.4 cm 1 with occasional splitting). This random variation in properties over large-area PCD coating may hamper reproducible diamond growth for any meaningful technological application.

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Section: 3 Diamond Nanostructurementioning

confidence: 76%

“…But none of the reported nanostructures resemble the presently obtained diamond nanoplates along the cross section of the freestanding PCD. The closest structure was deposited by MPCVD on a Ni-coated HFCVD-grown PCD substrate [51]. The nanoplates grown by Chen and Chang are single crystalline and 30-70 nm thick.…”

Section: 3 Diamond Nanostructurementioning

confidence: 99%

Property mapping of polycrystalline diamond coatings over large area

et al. 2014

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“…S2). Diamond platelets have been reported for diamond synthesis by CVD (20)(21)(22). However, the growth of platelet-shaped diamond crystals at high pressure has been so far only observed when a periodic mesostructured silica/carbon composite was used as the reactant (23).…”

Section: Resultsmentioning

confidence: 99%

Catalyst-free synthesis of transparent, mesoporous diamond monoliths from periodic mesoporous carbon CMK-8

Zhang

Mohanty

Coombs

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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We report on the synthesis of optically transparent, mesoporous, monolithic diamond from periodic mesoporous carbon CMK-8 at a pressure of 21 GPa. The phase transformation is already complete at a mild synthesis temperature of 1,300°C without the need of a catalyst. Surprisingly, the diamond is obtained as a mesoporous material despite the extreme pressure. X-ray diffraction, SEM, transmission electron microscopy, selected area electron diffraction, high-resolution transmission electron microscopy, and Z-contrast experiments suggest that the mesoporous diamond is composed of interconnected diamond nanocrystals having diameters around 5-10 nm. The Brunauer Emmett Teller surface area was determined to be 33 m 2 g −1 according Kr sorption data. The mesostructure is diminished yet still detectable when the diamond is produced from CMK-8 at 1,600°C and 21 GPa. The temperature dependence of the porosity indicates that the mesoporous diamond exists metastable and withstands transformation into a dense form at a significant rate due to its high kinetic inertness at the mild synthesis temperature. The findings point toward ultrahard porous materials with potential as mechanically highly stable membranes.high pressure | nano

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“…Our previous experiments have shown that unique, two-dimensional, single-crystalline diamond, {111} tabular nanoplatelets or nanosheets in the shape of trapezoids and parallelograms can be deposited on polycrystalline diamond substrates with a Ni-coated layer by high-temperature MPCVD. [9,13] Recently, Lu et al reported that regular {110}…”

Section: Introductionmentioning

confidence: 99%

“…of diamond material is important for practical nanotechnology applications. [6][7][8][9] Some reports have predicted that diamond in nanorod form has unusual mechanical properties. [6] The excellent mechanical properties, such as high elastic modulus and strength-toweight ratio, are suggested to be the ideal choice for nanometer-size electro-mechanical devices.…”

Section: Introductionmentioning

confidence: 99%

Growth of Diamond Nanoplatelets by CVD

Chen

Chang

Cho

et al. 2008

Chemical Vapor Deposition

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Hexagonal, single-crystalline, diamond nanoplatelets synthesized by microwave plasma (MP)CVD on Au-Ge alloy and nanocrystalline diamond (nc-diamond) film substrates, respectively, are reported. On the nc-diamond matrix, hexagonal diamond nanoplatelets can grow to a thickness of as little as approximately 10 nm. The effects of various processing parameters, such as methane concentration, microwave power, and gas pressure, on the growth of diamond nanoplatelets are explored. High-resolution transmission electron microscopy (HRTEM) reveals that the diamond nanoplatelets contain multi-parallel twins, and the side faces of the platelets exhibit {100}/{111} ridge-and-trough structure. Anisotropic growth of diamond nanoplatelet is believed to result from the side face structure of the twinned platelets and intensive plasma reaction.

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Characterization of diamond nanoplatelets

Cited by 19 publications

References 15 publications

Property mapping of polycrystalline diamond coatings over large area

Property mapping of polycrystalline diamond coatings over large area

Catalyst-free synthesis of transparent, mesoporous diamond monoliths from periodic mesoporous carbon CMK-8

Growth of Diamond Nanoplatelets by CVD

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