Elaboration and characterization of luminescent porous SiC microparticles/poly vinyl alcohol thin films

In this study, Morphological, optical and photoluminescence characterizations of nanostructured SiC micropowder embedded in PVA matrix and deposited as thin films on glass substrates are reported. we prepared the porous SiC microparticles/PVA thin films by spin coating method. The average size of SiC microparticles were 7 μm. An electroless method was used for producing porous silicon carbide powder under UV irradiation. Silver nanoparticles coated SiC powder was formed by polyol process. The etchant was composed of aqueous HF and different oxidants. Various porous morphologies were obtained and studied as a function of oxidant type, etching time, and wavelength of irradiation. We concluded that the chemical etching conditions of SiC powder seems to have a large impact on the resulting properties. We noticed that the best photoluminescence property was achieved when SiC powder was etched in HF/K2S2O8 at reaction temperature of 80 °C for t = 40min and under UV light of 254 nm.