Abstract
Ni-doped Copper Oxide nanostructures have been synthesized using the modified auto-combustion method. The structural, morphological, vibrational, linear, and nonlinear optical properties were examined. XRD pattern revealed that the samples exhibited a monoclinic structure having a space group C2/c. Origin of adsorbed oxygen and bivalent state of Cu and Ni were revealed from XPS analysis. HRTEM and FEG-SEM images with EDAX spectra confirmed the formation of spherical particles with smooth surfaces and also validated the purity of synthesized nanostructures. The magnetic measurements confirmed the nanoscale doping of Ni specifically from the superparamagnetic behaviors. The characteristic vibrational modes of CuO were identified from the vibrational analysis. The red-shifted Raman mode with broadening indicates the formation of disorders and size effects. The UV-Visible spectrum showed a decreasing trend in bandgap with an increment in nickel concentration, corresponding to the presence of intra-band defect/imperfection states. Emission peaks obtained from room temperature photoluminescent spectrum indicated the presence of defects in the nanostructures. Third-order nonlinear optical properties, measured via, the Z-scan method with the help of a continuous wave (CW) laser and an enhancement in the nonlinear optical parameters were observed on doping. Hence it confirmed that the prepared nanostructures can be used for various optoelectronic applications.
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