Synthesis, characterization, low temperature solid state PL and photocatalytic activities of Ag₂O·CeO₂·ZnO nanocomposite

A novel multi-metal nanocomposite oxide Ag2O·CeO2·ZnO has been prepared by co-precipitation of their carbonates from aqueous solutions of the metal nitrates following calcinations and annealing 5h at 450°C and 4h at 600°C. Ag2O·CeO2·ZnO has been characterized by XRD, SEM, EDS and PL spectra. According to XRD results the crystallite size of Ag2O·CeO2·ZnO varies in the range of 19-111 nm with an average size of 50 nm, which is in good agreement with SEM results. Elemental analysis was performed by SEM-EDS. Emissions of Ag2O·CeO2·ZnO has been observed in UV (NBE emission), visible and NIR regions at 325 nm excitation by a line of He-Cd laser. Photocatalytic as well as anti-bacterial activities have been studied. The nano composite Ag2O·CeO2·ZnO shows an excellent photocatalytic dye degradation activity.

Photoluminescence, photocatalytic and antibacterial activities of CeO2·CuO·ZnO nanocomposite fabricated by co-precipitation method

A novel tri-metallic oxide nanocomposite CeO2·CuO·ZnO has been synthesized by a simple co-precipitation method. The nanocomposite has been characterized by XRD, SEM, EDS, FTIR and PL spectra. The crystallite size of the CeO2·CuO·ZnO was calculated using XRD data. The crystallite size of the CeO2·CuO·ZnO mixed metal oxide annealed at 600 °C is found to be in range of 15.34-44.81 nm, with an average size of 29.51 nm. Excitation at different wavelengths showed PL in UV and visible regions. It has been found that PL behavior of CeO2·CuO·ZnO is excitation wavelength dependent. This flexible PL property is conflicting to well-known Kasha's rule of excitation wavelength dependence of emission spectrum. The catalyst shows better photo-catalytic dye degradation efficiency in slightly alkaline pH in presence of H2O2. Nanocomposite CeO2·CuO·ZnO was found to be effective against pathogenic bacteria.

Synthesis, structure, PL and photocatalytic activities of La2O2CO3·CeO2·ZnO fabricated by co-precipitation method

A novel tri metallic oxide nanocomposite La2O2CO3·CeO2·ZnO has been synthesized by a simple co-precipitation method. The nanocomposite has been characterized by XRD, SEM, EDS, FTIR and PL spectra. The crystallite size of the La2O2CO3·CeO2·ZnO was calculated using XRD data. The crystallite size of the as synthesized sample varies in the range of 16-30nm and those annealed at 950°C in the range of 26-70nm. Excitation at different wavelengths showed PL in UV and visible regions. It has been found that PL behavior of La2O2CO3·CeO2·ZnO is excitation wavelength dependent. This PL property is conflicting to well-known Kasha's rule of excitation wavelength dependence of emission spectrum. The catalyst shows better photocatalytic dye degradation efficiency in slightly alkaline pH in presence of H2O2.

Synthesis, characterization, PL properties, photocatalytic and antibacterial activities of nano multi-metal oxide NiO⋅CeO2⋅ZnO

A novel multi-metal nanocomposite, NiO⋅CeO2⋅ZnO has been prepared by co-precipitation of their carbonates from aqueous solutions of the metal nitrates following calcination and annealing 5 h at 450°C and 10 h at 950°C. NiO⋅CeO2⋅ZnO has been characterized by XRD, SEM, EDS, IR and PL spectra. The crystallite size of the as-synthesized sample varies in the range of 14-23 nm and those of the annealed sample in the range of 17-50 nm. Emissions of NiO⋅CeO2⋅ZnO have been observed in UV (NBE emission) and visible region at different excitations. Excitation wavelength dependent PL behavior of NiO⋅CeO2⋅ZnO has been observed in acetone at room temperature. This PL property is in disagreement with Kasha's rule of excitation wavelength dependence of emission spectrum. Photocatalytic as well as anti-bacterial activities were studied.

Synthesis, structure and excitation wavelength dependent PL properties of novel nanocomposite La2O2CO3·CuO·ZnO

A novel multi-metal nanocomposite, La2O2CO3·CuO·ZnO has been synthesized by co-precipitation method and characterized by XRD, SEM, EDS and PL spectra. XRD showed the presence of La2O2CO3, CuO and ZnO phases with an average particle size of 20 nm. Excitation at different wavelengths showed PL in UV and visible regions. Excitation at 220-270 nm provided UV emissions. Excitations at 298, 324 and 355 nm showed PL in the violet and blue regions. Excitation at 395 and 450 nm provided green and red luminescence, respectively. It has been found that PL behavior of La2O2CO3·CuO·ZnO is excitation wavelength dependent. This PL property is contrary to well-known Kasha's rule of excitation wavelength dependence of emission spectrum. The excitation peaks at 300-325 (broad band), 353, 371, 394, 408 nm were observed when monitored at 450 nm.

Synthesis, characterization and spectroscopic investigations of novel nano multi-metal oxide Co3O4·CeO2·ZnO

A novel multi-metal nanocomposite, Co3O4·CeO2·ZnO has been prepared by co-precipitation of their carbonates from aqueous solutions of the metal nitrates following calcining and annealing 5h at 450°C and 10h at 950°C. Co3O4·CeO2·ZnO has been characterized by XRD, SEM, EDS, IR and PL spectra. The crystallite size of the as-synthesized sample varies in the range of 9-33nm and those of the annealed sample in the range of 19-42nm. Emissions of Co3O4·CeO2·ZnO were observed in UV and visible region at different excitations. Excitation wavelength dependent PL behavior of Co3O4·CeO2·ZnO has been observed in acetone. This PL property is contrary to the well-known Kasha's rule of excitation wavelength dependence of emission spectrum.