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Microwave-induced fabrication of copper nanoparticle/carbon nanotubes hybrid material
Nattaporn Leelaviwat,Siriporn Monchayapisut,Chantamanee Poonjarernsilp,Kajornsak Faungnawakij,김교선,Tawatchai Charinpanitkul 한국물리학회 2012 Current Applied Physics Vol.12 No.6
Copper nanoparticle/multi-walled carbon nanotube (MWCNT) hybrid material could be fabricated by microwave irradiation to a suspension of MWCNTs dispersed in copper precursor with the presence of ethylene glycol. Microscopic and spectroscopic analyses could confirm the uniform dispersion of copper oxide nanoparticles hybridized on the outer surface of MWCNTs. Reduction of Cu2+ ions to Cu2O and Cu nanoparticles was ascribed to functional groups which were generated after the precursor was irradiated by microwave. Sufficient irradiation time of 5 min or longer played an important role to induce the agglomeration of copper oxide nanoparticles on the MWCNT surface.
Effect of arc current on characteristics of nanocarbons prepared by cryogenic arc discharge method
Tawatchai Charinpanitkul,Kijchai Kanjanaprapakul,Nattaporn Leelaviwat,Nayot Kurukitkoson,김교선 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
A variety of nanocarbons (nanohorns, nanoflowers and nanoclusters) could be prepared by arc discharge in cryogenic nitrogen with either graphite–graphite or iron–graphite electrodes manipulated by a strategy of automatic electrode delivering. Based on local thermal equilibrium assumption, magnetohydrodynamic equations were taken into account for estimating the arc power efficiency of 60–84%,depending on the electrode combination. The effects of arc current on the morphology and yield of nanocarbons were investigated within a range of 75–150 A. Transmission electronmicroscopic analyses revealed that the synthesized product consisted of single-walled carbon nanohorns and multi-walled carbon nanoflowers with nominal diameters of 100–200 nm when graphite–graphite electrodes were employed but nanoclusters containing Fe nanoparticles inside carbon nanoshells with smaller size of 70–120 nm were mainly synthesized by iron–graphite electrodes subject to arc discharge in cryogenic nitrogen. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.