Nonlinear Optical limiting behavior of Gd 3+ doped CoWO4 nanostructures

2015 
Nanocrystalline pure and Gd 3+ doped CoWO4 nanostructures were synthesized by single step chemical precipitation technique. The framework substitution of Gd in CoWO 4 nanoparticles was established by X-ray diffraction (XRD) and Fourier transform infrared (FT- IR) techniques. XRD pattern reveals the pure and doped CoWO4 nanoparticles belong to the monoclinic structure. The increase in Gd doping enhanced the 'blue-shift' in the UV-Vis absorption spectra. Electron microscopy studies clearly evidence the formation of round edged nanocubes with an average particle size of 60-80 nm, emerges in the polycrystalline nature. UV-Visible absorption spectra of Gd doped CoWO4 nanocrystals shows a strong absorption peak at 278nm. Nonlinear optical transmission studies of the nanocomposites is measured using the open aperture Z-scan technique employing 7 nanosecond laser pulses at 532 nm. Experimental results show that both pure CoWO4 and Gd doped nanoparticles exhibit excellent optical limiting performance.
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