Synthesis and comparative study of Ho and Y doped ZnO nanoparticles

Ho and Y doped ZnO nanoparticles were synthesized using a wet chemical route followed by structural, electrical and magnetic property characterization of the same. We present a comparison of the properties of Ho and Y (having same ionic radii) doped ZnO nanoparticles. X-ray diffraction studies of the diffraction data exhibit a monophasic wurtzite crystal structure similar to that of the parent compound, ZnO. Microstructural investigations of these samples by scanning electron microscopy show the presence of nanostructures. The optical measurements show an increase in the band gap of doped samples as compared to the undoped sample. DC magnetization measurements of Ho doped ZnO point towards the presence of hysteresis loop at 5 K with an H c of about 110 Oe for a nominal 1 mol% Ho doped sample. The resistivity of Ho doped sample is found to be higher as compared to the undoped and Y doped sample.