Copper oxide and cobalt oxide (Co3O4, CuO) nanocrystals (NCs) have been successfully prepared using microwave irradiation. The obtained powders of the nanocrystals (NCs) were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric (TGA) analysis and Fourier-transform infrared spectroscopy. The obtained results confirm the presence of both nanooxides which have been produced during chemical precipitation using microwave irradiation. TEM micrographs have shown that the obtained nanocrystals are characterized by high dispersion and narrow size distribution. The results of X-ray diffraction confirmed those obtained from the transmission electron microscope. Optical absorption analysis indicated the direct band gap for both kinds of the nanocrystals.
A. Senthil Kumar, R. Balaji, P. Puviarasu and S. Jayakumar
perovskite phase. The nanosized particles can be distributed uniformly in the individual phases or form a channel of single phase enabling the ion conduction through BCG electrolyte which, in turn, increases the total conductivity in such composites [ 7 , 9 ].
The solid electrolyte was sintered using a simple microwave technique in minimum soaking time. The benefit of using microwaveoven is the possibility to enhance densification of the solid electrolyte in relatively shorter processing time, when compared with the conventionally sintered electrolyte [ 10 ]. The
P. Naresh Kumar, K. Sakthivel and V. Balasubramanian
of pale white precipitate. The solution was decanted and the precipitate was dried in microwaveoven for 5 minutes. Finally, a pale white powder obtained was annealed at 400 °C for 1 h.
Preparation of ZnO photoelectrode
The prepared ZnO nanoparticles were coated onto the conducting side of FTO substrate by doctor blade method. Few drops of very dilute acetic acid were added to 1 g of prepared ZnO nanoparticles and grinded in a mortar with a pestle until a colloidal suspension with a smooth consistency was obtained. Then 2 or 3 drops of the ZnO