Effect of methane concentration on size of charged clusters in the hot filament diamond CVD process

Jeon, In-D.; Park, Chang J.; Kim, Doh-Y.; Hwang, Nong M.

doi:10.1016/s0022-0248(00)01016-2

Cited by 65 publications

(33 citation statements)

References 35 publications

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“…Our calculation here is consistent with experiments showing that the negatively charged clusters are likely to remain with less hydrogen adsorption. 13,38,39 Also, results in this work support our earlier assumption that the formation of diamond particles is independent of hydrogen pressure and those diamond particles are negatively charged. 5,6,13…”

Section: Fig 2 Model Geometries Of Diamond Nanoclusters ͑A͒supporting

confidence: 85%

First-principles study of the effect of charge on the stability of a diamond nanocluster surface

Park

Hwang

et al. 2004

Phys. Rev. B

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Effects of net charge on the stability of the diamond nanocluster are investigated using the first-principles pseudopotential method with the local density approximation. We find that the charged nanocluster favors the diamond phase over the reconstruction into a fullerene-like structure. Occupying the dangling bond orbitals in the outermost surface, the excess charge can stabilize the bare diamond surface and destabilize the C-H bond on the hydrogenated surface. In combination with recent experimental results, our calculations suggest that negative charging could promote the nucleation and further growth of low-pressure diamond.

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Section: Fig 2 Model Geometries Of Diamond Nanoclusters ͑A͒supporting

confidence: 85%

First-principles study of the effect of charge on the stability of a diamond nanocluster surface

Park

Hwang

et al. 2004

Phys. Rev. B

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“…These measurements were done based on the previous study of Hwang et al (Hwang et al 1996;Hwang et al 2000;Hwang & Kim 2004;Huh et al 2005;Song et al 2007), who suggested that these charged nanoparticles should be a main flux for the growth of films, nanowires, and nanotubes. The generation of charged nanoparticles in the gas phase was experimentally confirmed in various CVD processes (Cheong et al 1999;Jeon et al 1999;Jeon et al 2000;Jeon et al 2001;Ahn et al 2002;Kim et al 2006). A concept similar to the two-step growth was suggested by Ostrikov (2005) in the silane plasma CVD process.…”

Section: Introductionmentioning

confidence: 91%

Generation of Charged Nanoparticles during Synthesis of ZnO Nanowires by Carbothermal Reduction

Kim

Chung

Youn

et al. 2009

Aerosol Science and Technology

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We measured the size distribution of positively and negatively charged nanoparticles generated abundantly in the gas phase during the syntheses of ZnO nanowires by a carbothermal reduction process using a differential mobility analyzer. Under the conditions where these charged nanoparticles were not generated, no nanowires could be grown. The evolution of ZnO nanostructures on the substrate was studied with in-situ measurements of the size distribution of charged nanoparticles with varying reactor temperature and oxygen flow rate. The results suggest that the electrostatic energy arising from charged nanoparticles would play a critical role in the growth of ZnO nanowires.

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“…Second, the atomic diffusion should be enhanced remarkably by the presence of charge, judging from the fact that void-free crystals can grow by the building block of charged nanoparticles. Third, the diffusion enhanced by charge depends on the number of atoms per charge or the size of the charged nanoparticles, judging from the fact that small charged nuclei produced diamond crystals with well-defined facets whereas large ones produced ball-like or cauliflower structures (Jeon et al 2001b). …”

Section: Introductionmentioning

confidence: 99%

Generation of Charged Nanoparticles During the Synthesis of GaN Nanostructures by Atmospheric-Pressure Chemical Vapor Deposition

Lee

Kim

Hwang

2012

Aerosol Science and Technology

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The possibility that GaN charged nanoparticles might be generated during the synthesis of GaN nanostructures was examined in an atmospheric-pressure chemical vapor deposition (CVD) process using a differential mobility analyzer combined with a Faraday cup electrometer. Both positively and negatively charged nanoparticles in the size range of 10-100 nm were generated in the reactor of the CVD process using Ga 2 O 3 precursor and NH 3 gas. With decreasing flow rate of NH 3 from 400 to 0 standard cubic centimeter per min (sccm) and decreasing reactor temperature from 1100• C to 500• C, the size and the number concentration of charged nanoparticles decreased. As the size and the number density decreased, the size of deposited GaN hexagonal crystals decreased and eventually GaN nanowires began to grow without catalysts.

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Effect of methane concentration on size of charged clusters in the hot filament diamond CVD process

Cited by 65 publications

References 35 publications

First-principles study of the effect of charge on the stability of a diamond nanocluster surface

First-principles study of the effect of charge on the stability of a diamond nanocluster surface

Generation of Charged Nanoparticles during Synthesis of ZnO Nanowires by Carbothermal Reduction

Generation of Charged Nanoparticles During the Synthesis of GaN Nanostructures by Atmospheric-Pressure Chemical Vapor Deposition

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