Plasma synthesis and characterization of nanocrystalline aluminum nitride particles by aluminum plasma jet discharge

Kim, Kyoung-Jin

doi:10.1016/j.jcrysgro.2005.06.018

Cited by 32 publications

(22 citation statements)

References 19 publications

(19 reference statements)

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“…This value is similar to those previously measured in TEM studies of AlN nanowires and other nanoparticles. 18,22,23 The initial oxygen and hydrogen concentrations of the as-received AlN powders in the present study were 0.82 wt% and 237 ppm respectively (1.0 x 10 21 O/cm 3 and 4.7 x 10 20 H/cm 3 ), as measured by inert gas fusion. The atomic ratio of O/H is 2.2 suggesting most of the oxygen is present as AlOOH, since it has a O/H ratio of 2.0.…”

Section: Resultsmentioning

confidence: 55%

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Native oxide and hydroxides and their implications for bulk AlN crystal growth

Edgar

Nyakiti

et al. 2008

Journal of Crystal Growth

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Oxygen degrades the properties of AlN, thus producing bulk single crystals with low oxygen concentrations is an important goal. Most of the oxygen in bulk AlN single crystals grown by the sublimation-recondensation method originates from the hydroxides and oxides that spontaneously form on the surfaces of the AlN source powder. For a typical AlN powder with an average particle size of 1-2 microns, a 1-3 nm thick oxide and/or hydroxide can account for most of its oxygen (generally on the order of 1.0 wt%) and hydrogen (200-300 ppm). Heating the AlN powder source at 1950 °C for 10 h in a nitrogen atmosphere reduced its surface area by a factor of 160 (due to sintering), the oxygen concentration by 16, and the hydrogen concentration by 67. The difference in these reduction factors suggests some of the oxygen is dissolved into the bulk AlN with this heat treatment. By first annealing the AlN powder at a low temperature (950-1000 °C) for several hours before sintering at 1950 °C, the oxygen and hydrogen concentrations were reduced to lower levels. The low temperature treatment is effective eliminating oxygen and hydrogen from the surface of the powder, while high temperature sintering reduces the specific surface area of the source. The combination of heat treatments produced a source with oxygen and hydrogen concentrations as low as 0.015 wt% O (1.9 x 10 19 atoms O cm -3 ) and 1.7 ppm H (3.4 x 10 18 atoms H cm -3 ). Annealing becomes less effective at removing oxygen and hydrogen with longer heat treatments, suggesting there is a minimum oxygen concentration that can be produced with this method.

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Section: Resultsmentioning

confidence: 55%

“…Examing published high resolution transmission electron micrographs of AlN nanoparticles by Panchula and Yang, 18 Shen et al, 22 Kim, 23 and others suggests that the native oxide/hydroxide is 1.5 nm to 3 nm thick.…”

Section: Introductionmentioning

confidence: 99%

Native oxide and hydroxides and their implications for bulk AlN crystal growth

Edgar

Nyakiti

et al. 2008

Journal of Crystal Growth

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“…In this instant and in the case of applying an RF plasma, the design of the nozzle is the crucial point with respect to the processing parameter. Nozzle design ranges from very simple ones to highly sophisticated ones with hypersonic gas velocities 1,2) . Within the plasma, the particles move in the direction of the gas stream, and in addition, they move randomly.…”

Section: Ac and DC Systemsmentioning

confidence: 99%

“…In this instance, AlN was synthesized from aluminum vapor in a 50/50 vol% nitrogen/ammonia atmosphere. An ablating aluminum electrode was used as the source for the metal vapor 2) . To obtain sufficiently high plasma temperatures, the plasma was supplied with electrical energy using a pulsed DC source.…”

Section: Ac and DC Systemsmentioning

confidence: 99%

Plasma Synthesis of Nanoparticles

Vollath

2007

KONA

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“…In fact, many studies have been conducted on the synthesis of AlN by EWE. [11][12][13][14][15] However, efforts to synthesize TiN through EWE were comparatively scarce. To our knowledge, the first study on this subject was made by Jonich et al in 1965.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of TiN Nanoparticles by Explosion of Ti Wire in Nitrogen Gas

et al. 2009

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Nano-sized Titanium nitride powders were synthesized by electrical explosion of Ti wire under nitrogen atmosphere ranging from 0.2 to 1.5 atm. Electron microscopy and X-ray diffraction studies revealed that the reaction products are cube-shaped single phase TiN nanoparticles. The lattice parameter of TiN nanoparticles increased with nitrogen pressure in the chamber. The nitrogen content of nanoparticles was estimated from their lattice parameter being comparable to the stoichiometric composition of TiN. Small amount of TiN 0:3 phase was formed when nitrogen pressure in the chamber was low.

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Plasma synthesis and characterization of nanocrystalline aluminum nitride particles by aluminum plasma jet discharge

Cited by 32 publications

References 19 publications

Native oxide and hydroxides and their implications for bulk AlN crystal growth

Native oxide and hydroxides and their implications for bulk AlN crystal growth

Plasma Synthesis of Nanoparticles

Synthesis of TiN Nanoparticles by Explosion of Ti Wire in Nitrogen Gas

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