‘Nano-rods’ of single crystalline diamond

Ando, Yutaka; Nishibayashi, Yoshiki; Sawabe, Atsuhito

doi:10.1016/j.diamond.2003.10.066

Cited by 91 publications

(58 citation statements)

References 17 publications

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“…The authors attributed the high aspect ratio growth to the extension of [45][46][47][48][49]. Moreover, it has been shown that CVD diamond can be grown into solid or hollow fiber-, wire-or tube-like structures by using suitable templates ② .…”

Section: 3 Diamond Nanostructurementioning

confidence: 99%

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: 99%

Property mapping of polycrystalline diamond coatings over large area

et al. 2014

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“…It was also observed that under certain growth conditions, the growth rates along the {100} and {110} directions may prevail over the {111} ones 23 . The growth directions of the DNWs are affected by several factors including the substrate surface and gas pressure 23,24 and energetics is not the sole factor controlling the growth of DNWs.…”

Section: Models and Methodsmentioning

confidence: 97%

Diamond nanowires with nitrogen vacancy under a transverse electric field

et al. 2015

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Abstract:We have investigated the electronic, magnetic and optical properties of hydrogenated diamond nanowires (DNW) with nitrogen-vacancy (NV) centers using density functional theory (DFT). The strong localization of defect states results in the formation of local magnetic moments with a spin polarization energy that is close to those for transition metal atoms. Such spin-polarized defect states are found to be stable well above room temperature, in agreement with previous experimental reports.In addition, we find that a semiconductor-metal transition can be triggered upon applying a transverse electric field. Furthermore, an enhanced optical absorption in the visible-light region is predicted in DNW with NV centers. The strength and the position of the absorption can be tuned or optimized by an external electric field and/or the nanowire diameter.

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“…These findings have opened the way for the design and fabrication of pointed diamond nanostructures also for emitting purposes. By using a mask and a CH 4 /O 2 RF plasma Ando et al 86 produced high-quality single-crystal diamond nanorods on a (100) oriented diamond crystal. Fig.…”

Section: D Structuresmentioning

confidence: 99%

Nanodiamonds for field emission: state of the art

Terranova

Orlanducci

Rossi³

et al. 2015

Nanoscale

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The aim of this review is to highlight the recent advances and the main remaining challenges related to the issue of electron field emission (FE) from nanodiamonds. The roadmap for FE vacuum microelectronic devices envisages that nanodiamonds could become very important in a short time. The intrinsic properties of the nanodiamond materials indeed meet many of the requirements of cutting-edge technologies and further benefits can be obtained by tailored improvements of processing methodologies. The current strategies used to modulate the morphological and structural features of diamond to produce highly performing emitting systems are reported and discussed. The focus is on the current understanding of the FE process from nanodiamond-based materials and on the major concepts used to improve their performance. A short survey of non-conventional microsized cold cathodes based on nanodiamonds is also reported. IntroductionMiniaturized electron sources based on the field emission (FE) process, namely "cold-cathodes", are nowadays replacing the conventional thermoionic electron sources. FE-based devices are able to operate at high frequency and at high current densities, have no need of heating and are characterized by reduced weight and by instantaneous switching on. Moreover, Maria Letizia TerranovaProfessor of Chemistry at Tor Vergata University of Rome (Italy), Maria Letizia Terranova heads the Minima lab at the Department of Chemical Science and Technology. She has expertise on different scientific topics, including nuclear chemistry, laser-induced reactions in the gas-phase, ion-and laserinduced modifications in solids, electrochemical and vapour deposition processes. Her research activity is mainly focused on the synthesis, processing and functional testing of nanomaterials: carbon nanostructures (nanodiamonds, nanotubes, graphenes, onions), nanocomposites and hybrid organic/ inorganic structures. Materials and systems are produced for applications in micro/nano-electronics, optoelectronics, energetics, sensing, thermal management and bio-related nanotechnologies. She has co-authored 290 papers, 4 patents, and co-edited 4 books. Silvia OrlanducciIn 2004 Fowler-Nordheim and the experiments by Spindt and coworkers 3 paved the way for a number of subsequent researches on FE-based vacuum electronics. The good performance of such devices is based on the fact that, according to the Fowler-Nordheim law, the emitted current density J depends strongly on the local applied electric field E and that geometric factors typical of nanostructures (sharp edges, tips, peaks, nanoprotrusions) locally increase the concentration of electric field at the emitter sites. The ratio of the local field to the applied field, the so-called electric field enhancement factor β, 1 independently of the material, is a key factor influencing the field emission characteristics. In the last two decades the design, realization and application of a new generation of cold cathodes based on advanced nanomaterials have been the object of tremendous i...

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‘Nano-rods’ of single crystalline diamond

Cited by 91 publications

References 17 publications

Property mapping of polycrystalline diamond coatings over large area

Property mapping of polycrystalline diamond coatings over large area

Diamond nanowires with nitrogen vacancy under a transverse electric field

Nanodiamonds for field emission: state of the art

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