Characterization of SiC/C Nanocomposite Powders Synthesized by Arc-Discharge
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In this paper, three carbon sources, i.e., solid graphite, gaseous CH4 and liquid ethanol, and one solid silicon source were employed to synthesize SiC/C nanocomposite powders by arc-discharge plasma. The processing conditions such as the component ratios of raw materials, atmospheric gases, etc. were adjusted for controllable synthesis of the nanopowders. It is indicated that both of solid graphite and silicon can be co-evaporated and reacted to form nanophases of cubic β-SiC with ~50 nm in mean size and a little free graphite; the carbon atoms decomposed from gaseous CH4 favor to combine with the evaporated silicon atoms to form the dominant SiC nanophase; liquid carbon source of ethanol can also be used to harvest the main β-SiC and minor 6H-SiC phases in the assembly of nanoparticles. The as-prepared SiC/C nanocomposite powders were further purif ed by a heat-treatment in air and their photocatalytic performances were then greatly improved.
Abstract
In this paper, three carbon sources, i.e., solid graphite, gaseous CH4 and liquid ethanol, and one solid silicon source were employed to synthesize SiC/C nanocomposite powders by arc-discharge plasma. The processing conditions such as the component ratios of raw materials, atmospheric gases, etc. were adjusted for controllable synthesis of the nanopowders. It is indicated that both of solid graphite and silicon can be co-evaporated and reacted to form nanophases of cubic β-SiC with ~50 nm in mean size and a little free graphite; the carbon atoms decomposed from gaseous CH4 favor to combine with the evaporated silicon atoms to form the dominant SiC nanophase; liquid carbon source of ethanol can also be used to harvest the main β-SiC and minor 6H-SiC phases in the assembly of nanoparticles. The as-prepared SiC/C nanocomposite powders were further purif ed by a heat-treatment in air and their photocatalytic performances were then greatly improved.
참고문헌 (26)
- Anieuddh M, "Nitrogen doped Sr2Ta2O7 coupled with graphene sheets as photocatalysts for increased photocatalytic hydrogen production", Nano, 5, pp.3483~3492 (2011)
- Cai X K, "Synthesis of vertically-aligned carbon nanotubes without a catalyst by hydrogen arc discharge", Carbon, 50, pp.2726~2730 (2012)
- Dong X L, "The preparation and characterization of ultrafi ne Fe -Ni particles", J. Mater. Res, 14, pp.398~406 (1999)
- Fujishima A, "Electrochemical photolysis of water at a semiconductor electrode", Nature, 238, pp.37~38 (1972)
- Georg W, "Photocurrents and degradation rates on particulate TiO2 layers effect of layer thickness, concentration of oxidizable substance and illumination direction", Electrochimica Acta, 50, pp.4498~4504 (2005)
- George H, "A new route to monolithic macroporous SiC", C composites from biphenylene-bridged polysilsesquioxane gels, 2010, pp.22, 2541~2547
- Guo G F, "Electrochemical hydrogen storage of the graphene sheets prepared by DC arc-discharge method", Surf. Coat. Technol, 228, pp.120~125 (2013)
- Isaias J R, "Short time deposition of TiO2 nanoparticles on SiC as photocatalysts for the degradation of organic dyes", Res. Chem. Inter, 39, pp.1523~1531 (2013)
- Kang M G, "Enhanced photodecomposition of 4-chlorophenol in aqueous solution by deposition of CdS on TiO2", J. Photochem. Photobiol. A, 125, pp.119~125 (1999)
- Kang Z H, "Silicon quantum dots: a general photocatalyst for reduction, decomposition, and selective oxidation reactions", Am. Chem. Soc, 129, pp.12090~12091 (2007)
- Kang Z, "Water-soluble sili con quantum dots with wavelength-tunable photoluminescence", Adv. Mater, 21, pp.661~664 (2009)
- Kim H Y, "Fabrication of SiC-C coa xial nanocables: thickness control of C outer layers", Chem. Comm, 20, pp.2634~2635 (2003)
- Lei J P, "Formation and hydrogen storage properties of in situ prepared Mg-Cu alloy nanoparticles by arc discharge", Int. J. Hydrogen Energy, 34, pp.8127~8134 (2009)
- Liu H L, "Porous SiC nanowire arrays as stable photocatalyst for water splitting under UV irradiation", Mater. Res. Bull, 47, pp.917~920 (2012)
- Liu Y S, "Fabrication and photocatalytic properties of silicon nanowires by metal-assisted chemical etching:effect of H2O2 concentration", Nanoscale Res. Lett, 7, pp.663~ (2012)
- Nacera M, "Photocatalytic activity of silicon nanowires under UV and visible light irradiation", Chem. Commun, 47, pp.991~993 (2011)
- Nariki Y, "Production of ultra fi ne SiC powder from SiC bulk by arc-plasma irradiation under different atmospheres and its application to photocatalysts", J. Mater. Sci, 25, pp.3101~3104 (1990)
- Nicolas K, "A new TiO2-β-SiC material for use as photocatalyst", Mat. Lett, 58, pp.970~974 (2004)
- Noboru O, "Growth of large high-quality SiC single crystals", J. Crystal Growth, 237, pp.1180~1186 (2002)
- Pan X, "Comparing graphene-TiO2 nanowire and graphene-TiO2 nanoparticle composite photocatalysts", Mater. Interf, 4, pp.3944~3950 (2012)
- Saber A, "Heterogeneous photocatalytic degradation of phenols in wastewater:a review on current status and developments", Desalination, 261, pp.3~18 (2010)
- Shao M, "Excellent photocatalysis of HFtreated silicon nanowires", J. Am. Chem. Soc, 131, pp.17738~17739 (2009)
- Yu H T, "TiO2-carbon nanotube heterojunction arrays with a controllable thickness of TiO2 layer and their fi rst application in photocatalysis", J. Photochem. Photobiol. A: Chem, 200, pp.301~306 (2008)
- Zhou W M, "SiC nanowires: a photocatalytic nanomaterial", Appl. Phy. Lett, 89, pp.13105~13101 (2006)
- Zhu K X, "Graphene covered SiC powder as advanced photocatalytic material", Phy. Lett, 100, pp.023113-1~023113-4 (2012)
- Zhu K X L, "Graphene covered SiC powder as advanced photocatalytic material", Phy. Lett, 100, pp.023113~ (2012)