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Aerosol Synthesis and Growth Mechanism of Magnetic Iron Nanoparticles
Tolochko O.V.,Vasilieva E.S.,Kim D.,Lee D.W.,Kim B.K. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Magnetic oxide-coated iron nanoparticles with the mean size ranging from 6 to 75 nm were synthesized by aerosol method using iron carbonyl as a precursor under the flowing inert gas atmosphere. Oxide shells were formed by passivation of asprepared iron particles. The influence of experimental parameters on the nanoparticles' microstructure, phase composition and growth behavior as well as magnetic properties were investigated and discussed in this study.
Synthesis of tungsten disulphide nanoparticles by the chemical vapor condensation method
Vasilyeva, E.S.,Tolochko, O.V.,Kim, B.K.,Lee, D.W.,Kim, D.S. Elsevier 2009 Microelectronics journal Vol.40 No.4
Crystalline tungsten disulphide nanoparticles were successfully synthesized by the chemical vapor condensation (CVC) method. The process performed as decomposition of tungsten hexacarbonyl over sulphur vapor in inert gas flow, where WS<SUB>2</SUB> nanoparticles were synthesized by direct reaction between as formed pure tungsten nanoclusters and sulphur vapor. Influence of experimental parameters on shape, size distribution, structure and phase composition of nanoparticles were evaluated by transmission and scanning electron microscopy and X-ray diffraction analysis. The produced nanoparticles have closely spherical shape with the mean size in the range 20-70nm in diameter dependently of process parameters. Nested ''onion-like'' structure of nanoparticles was observed. The mean value of interlayer distance in the {0001} direction, is about 0.6358+/-0.031nm. Due to nanodimensional size, physical properties and layered structure tungsten disulphide nanoparticles have great potential as a solid lubricant material.
Synthesis and characterization of WS2 nanoparticles by chemical vapor condensation.
Lee, Dong-Won,Tolochko, O V,Turaev, Farkhod R,Kim, Dongsoo,Kim, Byoung-Kee American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.1
<P>Nano-sized WS2 based powders were synthesized by chemical vapor condensation (CVC) process using tungsten carbonyl (W(CO)6) as precursor and vaporized sulphur. Prior to WS2 nanopowders synthesis, pure tungsten nanopowders were produced by chemical vapor condensation to define the optimum synthesis parameters, which were then successfully applied to synthesize tungsten disulphide. The influence of experimental parameters on phase and chemical composition as well as mean size of the particles in order to produce pure tungsten and WS2 nanopowders was studied. Structure, phase composition and particles size of WS2 nanoparticles were precisely characterized by means of XRD, FESEM and TEM.</P>
화학기상응축법에 의한 나노구조 텅스텐카바이드 분말의 제조와 미세구조 변화
김병기,김진천,하국현,최철진,O.V.Tolochko 한국분말야금학회 2002 한국분말재료학회지 (KPMI) Vol.9 No.3
Nanosized tungsten carbide powders were synthesized by the chemical vapor condensation(CVC) process using the pyrolysis of tungsten hexacarbonyl($W(CO)_6$). The effect of CVC parameters on the formation and the microstructural change of as-prepared powders were studied by XRD, BET and TEM. The loosely agglomerated nanosized tungsten-carbide($WC_{1-x}$) particles having the smooth rounded tetragonal shape could be obtained below $1000^{\circ}C$ in argon and air atmosphere respectively. The grain size of powders was decreased from 53 nm to 28 nm with increasing reaction temperature. The increase of particle size with reaction temperature represented that the condensation of precursor vapor dominated the powder formation in CVC reactor. The powder prepared at $1000^{\circ}C$ was consisted of the pure W and cubic tungsten-carbide ($WC_{1-x}$), and their surfaces had irregular shape because the pure W was formed on the $WC_{1-x}$ powders. The $WC_{1-x}$ and W powders having the average particles size of about 5 nm were produced in vacuum.
Aerosol Synthesis and Growth Mechanism of Magnetic Iron Nanoparticles
Kim, D.,Vasilieva, E.S.,Nasibulin, A.G.,Lee, D.W.,Tolochko, Oleg V.,Kim, Byoung Kee Trans Tech Publications, Ltd. 2007 Materials science forum Vol.534 No.-
<P>Magnetic oxide-coated iron nanoparticles with the mean size ranging from 6 to 75 nm were synthesized by aerosol method using iron carbonyl as a precursor under the flowing inert gas atmosphere. Oxide shells were formed by passivation of as-prepared iron particles. The influence of experimental parameters on the nanoparticles’ microstructure, phase composition and growth behavior as well as magnetic properties were investigated and discussed in this study.</P>
화학기상응축공정에 의한 WS<sub>2</sub> 나노입자의 합성 및 특성평가
이동원,김주형,올레그토로츠코,윤중열,김병기,Lee, Dong-Won,Kim, Ju-Hyeong,Tolochko, O.,Yun, Jung-Yeul,Kim, Byung-Kee 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.4
Nano-sized tungsten disulfide ($WS_2$) powders were synthesized by chemical vapor condensation (CVC) process using tungsten carbonyl ($W(CO)_6$) as precursor and vaporized pure sulfur. Prior to the synthesis of tungsten disulfide nanoparticles, the pure tungsten nanoparticles were produced by same route to define the optimum synthesis parameters, which were then successfully applied to synthesize tungsten disulfide. The influence of experimental parameters on the phase and chemical composition as well as mean size of the particles for the produced pure tungsten and tungsten disulfide nanoparticles, were investigated.