The synthesis of graphene nanowalls on a diamond film on a silicon substrate by direct-current plasma chemical vapor deposition

Tzeng, Yonhua; Chen, Wai Leong; Wu, Chia-En; Lo, Jui Yung; Li, Chiuan Yi

doi:10.1016/j.carbon.2012.10.038

Cited by 48 publications

(25 citation statements)

References 41 publications

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“…Diamond features the extraordinary properties of high thermal conductivity, good resistance to corrosion and electrical insulator. Covering diamond with GNWs is considered to be a very promising way for fabricating super-high thermal conductivity materials and excellent electrochemical electrode [6].…”

Section: Introductionmentioning

confidence: 99%

Architecting graphene nanowalls on diamond powder surface

Zou

Bai

et al. 2015

Composites Part B: Engineering

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Section: Introductionmentioning

confidence: 99%

Architecting graphene nanowalls on diamond powder surface

Zou

Bai

et al. 2015

Composites Part B: Engineering

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“…Three-dimensional and hybrid carbon films with outstanding properties such as standing multilayer-graphene-like carbon structures synthesized by plasma enhanced chemical vapor deposition (PECVD) on graphite and CVD diamond have been reported1112. MLG has also been reported to grow hetero-epitaxially on nano-scale facets of (111) silicon13.…”

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confidence: 99%

Nitrogen-incorporated ultrananocrystalline diamond and multi-layer-graphene-like hybrid carbon films

Tzeng

Yeh

Fang

et al. 2014

Sci Rep

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Nitrogen-incorporated ultrananocrystalline diamond (N-UNCD) and multi-layer-graphene-like hybrid carbon films have been synthesized by microwave plasma enhanced chemical vapor deposition (MPECVD) on oxidized silicon which is pre-seeded with diamond nanoparticles. MPECVD of N-UNCD on nanodiamond seeds produces a base layer, from which carbon structures nucleate and grow perpendicularly to form standing carbon platelets. High-resolution transmission electron microscopy and Raman scattering measurements reveal that these carbon platelets are comprised of ultrananocrystalline diamond embedded in multilayer-graphene-like carbon structures. The hybrid carbon films are of low electrical resistivity. UNCD grains in the N-UNCD base layer and the hybrid carbon platelets serve as high-density diamond nuclei for the deposition of an electrically insulating UNCD film on it. Biocompatible carbon-based heaters made of low-resistivity hybrid carbon heaters encapsulated by insulating UNCD for possible electrosurgical applications have been demonstrated.

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“…The layers in such a crystallite (CNW plates) form a hexagonal lattice (two-layer stacking of carbon atoms) [1,6,14]. If we consider the CNW crystallites as graphite plates, then their size (plate thickness) calculated The maximum height of the first CNW layer starting from the substrate is 2-4 μm, the total height of the first and second layers is approximately 8.5 μm (Fig.…”

Section: Materials Of Electronicsmentioning

confidence: 99%

Carbon nanowalls in field emission cathodes

et al. 2017

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Carbon materials, including various crystalline (diamond, graphite) and noncrystalline (fullerene, nanotubes, graphene, etc.) ordered substances with unique physicochemical properties are of practical interest. Some carbon materials due to the autoemission property are promising for use as an emitting layer of field emission cathodes (autocathodes). The presence of field emission means a decrease in the electric field strength to 1-10 V/μm, which is required for the onset of field emission of electrons. Autocathodes are used in the development of X-ray tubes, microwave devices, electron guns for exciting lasers, cathodoluminescent lighting devices, flat displays and other devices [1][2][3][4][5]. The most promising for the creation of autocathodes with a low electron emission barrier are the so-called carbon nanowalls (CNW) -layers of a plate-like carbon material with a predominant orientation of the plates perpendicular to the substrate [1][2][3].The layers of carbon materials formed by plasma methods, including CNW, are as a rule multiphase layers [6][7][8]. The structure and concentration of crystalline and X-ray amorphous phases depend on the conditions for carbon materials formation and affect their emission properties. The problems of using CNW in autocathodes are associated with the instability of emission parameters (magnitude and density of the cathode current, as well as the degree of electrical current uniformity over the cathode area) due to changes in composition and structure during testing and operation [4,6,8].Before being placed into electrovacuum devices and soldered, autocathodes are always preliminaryly tested in a vacuum chamber for compatibility with the parametres of the device. In some cases, preliminary tests are carried out to achieve such required parameters as autoemission current and its stability in time. Stability tests can be performed both in the voltage stabilization mode [4] and in the current stabilization mode. In the first case we consider cathode current dependence (decrease) on time at a fixed stabilized voltage, in the second case -voltage dependence (growth) on time at a fixed stabilized current. In both cases, the graphs of the dependencies (hereinafter aging curves) objectively characterize the degradation (aging) of the autocathode, regardless of what causes it.Storing the tested autocathodes with CNW layers on open air also leads to a deterioration of their emission properties. This is caused by the fact that during vacuum testing on the surface of CNW plates, the layer of adsorbed hydrocarbons is destroyed. This layer normally prevents adsorption of the components of the air mixture (water and nitrogen molecules, etc.) that impair the emission characteristics of the autocathodes [4, 15]. To recover the emission properties of autocathodes that had passed preliminary tests, they are annealing in vacuum or in an inert gas

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The synthesis of graphene nanowalls on a diamond film on a silicon substrate by direct-current plasma chemical vapor deposition

Cited by 48 publications

References 41 publications

Architecting graphene nanowalls on diamond powder surface

Architecting graphene nanowalls on diamond powder surface

Nitrogen-incorporated ultrananocrystalline diamond and multi-layer-graphene-like hybrid carbon films

Carbon nanowalls in field emission cathodes

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