Structural, optical and magnetic properties of Cr doped ZnO microrods prepared by spray pyrolysis method

Abstract

A series of Cr-doped ZnO micro-rod arrays were fabricated by a spray pyrolysis method. X-ray diffraction patterns of the samples showed that the undoped and Cr-doped ZnO microrods exhibit hexagonal crystal structure. Surface morphology analysis of the samples has revealed that pure ZnO sample has a hexagonal microrod morphology.From X-ray photoelectron spectroscopy studies, the Cr 2p3/2 binding energy is found to be 577.34 eV indicating that the electron binding energy of the Cr in ZnO is almost the same as the binding energy of Cr 3+ states in Cr 2 O 3 .The optical band gap E g decreases slightly from 3.26 to 3.15 eV with the increase of actual Cr content from x = 0.00 to 4.63 at % in ZnO. Photoluminescence studies at 10 K show that the incorporation of chromium leads to a relative increase of deep level band intensity. It was also observed that Cr doped samples clearly showed ferromagnetic behavior; however, 2.49 % Cr doped ZnO showed remnant magnetization higher than that of 1.07 % and 4.63 % Cr doped samples, while 4.63 % Cr doped ZnO samples had a coercive field higher than the other dopings.

Structural, optical and magnetic properties of Ni-doped ZnO micro-rods grown by the spray pyrolysis method

“…There are various methods to fabricate one-dimensional transition metal-doped ZnO materials. These techniques include chemical vapor deposition [21], hydrothermal method [22], thermal evaporation [23] and spray pyrolysis technique [24]. Among these, the spray pyrolysis is especially suitable, since it has proved to be a simple and inexpensive method, particularly useful for large area applications.…”

“…We discuss the relationship between the optical and magnetic properties with a view to explaining the origin of observed room temperature ferromagnetism in our Ni-doped ZnO micro-rod samples. [24]. The initial stock solution was prepared from zinc chloride (ZnCl 2 ) at 0.1 M concentration in deionized water.…”

Synthesis, physical properties and catalytic activity of Cr-doped ZnO nanoparticles

“…2. The spectra are almost equal to the typical XRD spectrum of undoped ZnO nanoparticles reported from other experiments [11][12][13][14][15]. The evolution of lattice parameters a and c as well as the unit cell volume, V, with doping concentrations by means of MAUD program [16] using Rietveld method are also tabulated in Table.1.…”

Role of Mg doping in the structural, optical, and electrical characteristics of ZnO-based DSSCs

“…ZnO rods exhibit a transmittance of nearly 50% at the wavelength range of 550-900 nm. The low transmittance is ascribed to the nonplanar surface of the rods, causing the light to scatter from the surface [26]. Compared to ZnO rods, the transmittance values of Mg-doped ZnO samples are low.…”