Shengming Zhou

Hydrothermal Fabrication of Spindle-type alpha-Fe 2 O 3 Nanoparticle and its Magnetic Property

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 (VSM). The results indicate that the synthesized individual spindle-type α-Fe₂O₃ nanoparticles are single crystals, and their hysteresis loops show that they have two kinds of magnetic properties, diamagnetism and paramagnetism

Large-Scale Synthesis of Herringbone Carbon Nanofibers on Nonsupported Nickel Catalyst

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 of the product prepared at 550degC have a helix-like shape and some CNFs are filled with nickel nanowires. HRTEM observation further reveals that the CNFs are herringbone-like and well graphitized.