CVD PREPARED Mn-DOPED ZnO NANOWIRES

Mn-doped ZnO nanowires prepared by chemical vapor deposition (CVD) were obtained in the temperature range of 450 500 o C. X-ray diffraction patterns, SEM and TEM images indicate that crystals with a hexagonal structure grow along the c axis. At low Mn-doped concentrations, photoluminescence (PL) and Raman scattering (RS) spectra are almost independent of the Mn doping. However, the increase in concentration of Mn above 1.6 at% weakens significantly the PL signal and the RS-lines intensity in the low wavenumber range of 300 480 cm -1 , and concurrently increases the RS-lines intensity in the higher wavenumber range of 480 700 cm -1 . Magnetic measurements determined the Curie temperature of Mn-doped ZnO nanowire to be about 37 K.