Abstract
The CdO NPs was synthesized using the sol–gel method and the nanoparticles were characterized using an UV–Vis spectrophotometer, with shape and size were examined by SEM and XRD. The XRD analysis respects the Bragg’s law and confirmed the crystalline nature of CdO nanoparticles. From the XRD, the average size of CdO NPs was found to be around 41 nm. The photoluminescence spectra of the CdO NPs, as recorded at room temperature, were excited at 300 nm wavelength. The broad emission peaks were between 600 and 650 nm (orange emission). The optical limiting performance of the nanocomposite was described in the sol–gel state. Also, this study has observed and studied the diffraction rings generated in CdO NPs using the same CW laser. The number of rings increases almost exponentially with an increasing volume fraction of SiO2 in the nanocomposites. The refractive index change, Δn, and effective nonlinear refractive index, n 2, were found to be 10−4 and 10−8 cm2/W, respectively. The effective nonlinear refractive index, n 2, was determined based on the observed number of rings. The threshold values of the CdO, CdO–2SiO2 and CdO–5SiO2 nanocomposites are 7.1, 6.55 and 6.34 mW, respectively. This large nonlinearity is attributed to the thermal effect. The present studies suggest that the nanocomposite is a potential candidate for optical device applications such as the optical limiters. The thermal blooming technique was applied to evaluate the thermo-optic coefficient and thermal diffusivity of the CdO NPs. In the thermal blooming experimental setup a transistor–transistor logic modulated CW laser of wavelength 532 nm was used as the excitation source.
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Badran, H.A., AL-Aladil, K.A., Lazim, H.G. et al. Thermal blooming and photoluminescence characterizations of sol–gel CdO–SiO2 with different nanocomposite. J Mater Sci: Mater Electron 27, 2212–2220 (2016). https://doi.org/10.1007/s10854-015-4013-0
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DOI: https://doi.org/10.1007/s10854-015-4013-0