• SWAPNA CHALLAGULLA

      Articles written in Bulletin of Materials Science

    • Unusual photoluminescence of Cu–ZnO and its correlation with photocatalytic reduction of Cr(VI)

      S SHRAAVAN SWAPNA CHALLAGULLA SOURI BANERJEE SOUNAK ROY

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      Cu–ZnO was synthesized by sol–gel routewith a varied copper concentration of 1, 2 and 3 mol%. The synthesizedmaterials were structurally characterized with powder X-ray diffraction and Raman spectroscopy, morphologically usinga field emission scanning electron microscope, and electronic properties were studied with UV–visible spectroscopy andphotoluminescence spectroscopy. Variation in Cu doping showed enhancement/quenching in photoluminescence of ZnO.This special characteristic is reflected in photocatalytic reduction of Cr(VI).

    • Role of synthesis of upconversion nanoparticles towards surface modification and photocatalysis

      SWAPNA CHALLAGULLA SOUMITRA PAYRA MAYUR BAJAJ SOUNAK ROY

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      TiO$_2$ being a wide band gap semiconducting material cannot use the solar insolation for photocatalysis. An interesting strategy is to dope TiO$_2$ with upconverting rare earth materials, which upon infrared (IR) or visible light irradiation can emit ultraviolet light to generate excitons in TiO$_2$ for further catalytic reactions. This manuscript reports the incorporationof Er$_2$O$_3$/Yb$_2$O$_3$ into TiO$_2$ via two synthetic methodologies. One of which yields the co-presence of rare earth oxides and TiO$_2$ on the surface, while the other synthetic route yields the rare earth oxides in the core of the TiO$_2$ shell. The detailed structural, morphological and optical properties of the laboratory synthesized materials were studied by powder XRD, FESEM,STEM, HR-TEM, BET, UV-DRS and PL. The surfaces of the materials did show some difference in their properties depending on their synthesis route, however, the two photon excitation was similar to both the set of materials.The synthesizedmaterials were studied for degradation of rhodamine B dye, and the results suggested that the presence of Er$_2$O$_3$/Yb$_2$O$_3$ on the TiO$_2$ surface was detrimental for catalytic application, while TiO$_2$ exposed on the surface with Er$_2$O$_3$/Yb$_2$O$_3$ in the core can be a choice of materials for photocatalytic application.

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