Hong-Yuan Chen

Preparation of CuO nanoparticles by microwave irradiation

Abstract CuO nanoparticles with an average size of ca. 4xa0nm have been successfully prepared by microwave irradiation, using copper (II) acetate and sodium hydroxide as the starting materials and ethanol as the solvent. The CuO nanoparticles are characterized by using techniques such as X-ray powder diffraction, transmission electron microscopy, selected area electron diffraction, X-ray photoelectron spectroscopy and UV–Visible absorption spectroscopy. The as-prepared CuO nanoparticles have regular shape, narrow size distribution and high purity. The band gap is estimated to be 2.43xa0eV according to the results of the optical measurements of the CuO nanoparticles.

Preparation of nanocrystalline ceria particles by sonochemical and microwave assisted heating methods

Nanocrystalline ceria (CeO2) particles have been successfully prepared via sonochemical and microwave assisted heating routes from aqueous solutions containing (NH4)2Ce(NO3)6, hexamethylenetetramine and poly (ethylene glycol)-19000 (PEG). The products were characterized by techniques such as powder X-ray diffraction, transmission electron microscopy, high-resolution transmission electron microscopy, selected area electron diffraction, Brunauer–Emmett–Teller nitrogen adsorption and UV–Visible absorption spectroscopy. Analysis of the results showed that the products had uniform shape, narrow size distribution and displayed conspicuous quantum size effects.

Synthesis of amorphous Fe2O3 nanoparticles by microwave irradiation

Abstract Amorphous Fe 2 O 3 nanoparticles of about 3–5 nm in size have been synthesized by microwave irradiation heating of an aqueous solution, containing ferric chloride, polyethylene glycol-2000 and urea. The Fe 2 O 3 nanoparticles were characterized by the techniques of TEM, XRD, DSC, TGA and magnetization measurements.