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Carbon nanofibers (CNFs) are synthesized at 450-650degC by a catalytic CVD method using nickel powders reduced from nickel carbonate as catalyst without other supporting materials, and acetylene as carbon source. It is found that the nickel powders present a considerable catalytic efficiency in the growth of the CNFs at the temperature between 500-550degC. TEM observation shows that a large portion...
Bamboo-shaped multiwall carbon nanotubes (BS-MWCNTs) activated by KOH with different KOH/CNT mass ratio are applied as electrodes for supercapacitors. The electrochemical capacitance of activated bamboo-shaped multiwall carbon nanotubes (ABS-MWCNTs) with KOH/CNT mass ratio 3:1 and 7:1 is 1.5 and 3 times that of the normal BS-MWCNTs, respectively. The activated materials still possess nanotubular morphology...
Magnetite (Fe3O4) nanoparticles uniformly loaded on multi-walled carbon nanotubes (MWCNTs) were synthesized by a wet chemistry method, and then carbon coated Fe3C nanoparticles supported by MWCNTs were prepared by heat-treatments subsequently in nitrogen at 600 degC and in acetylene atmosphere at 500 degC. The as-prepared nanoparticles were all single crystals with a size distribution ranging from...
Spindle-type α-Fe2O3 nanoparticles have been synthesized via a hydrothermal method, using Fe(NO3)3, NH4Cl and ethylene glycol as starting precursors. The resultant products were characterized by means of Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM) and vibrating sample magnetometer...
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