title: Cadmium oxide nanoparticles grown in situ on reduced graphene oxide for enhanced photocatalytic degradation of methylene blue dye under ultraviolet irradiation.
abstract: Cadmium oxide (CdO) nanoparticles (NPs), reduced graphene oxide (rGO) and rGO-CdO nanocomposites have been synthesized using one step hydrothermal method. The structural and optical properties of CdO NPs, rGO, and rGO-CdO nanocomposites were investigated by X-ray diffraction (XRD), energy dispersive X-ray (EDX), high resolution transmission electron microscopy (HR-TEM), Raman spectroscopy (RS), ultraviolet-visible spectroscopy (UV-Vis.) and photoluminescence (PL) spectroscopy techniques. The rGO has a sharp 2D peak compared to GO. The sharp nature of 2D band may be due to the larger contribution from single layer sheet. The photocatalytic activity of the synthesized samples has been investigated under UV irradiation. The results of photocatalytic measurements revealed that ~80% of MB dye is degraded by adding the rGO-CdO nanocomposites as photocatalysts into the dye solution. The decrease in the intensity of emission peaks indicates that the photogenerated charge carriers have been transferred from CdO NPs to rGO sheets, which causes to increase the density of O2(-) and OH radicals in the dye solution. The CdO nanoparticles gown on the rGO sheets showed enhanced ferromagnetism (FM) at room temperature, which may be attributed to the short range magnetic interaction of magnetic moments of CdO NPs and spin units present on the rGO sheets.
authors.affiliation: Department of Physics, Motilal Nehru National Institute of Technology, Allahabad 211004, India.
authors.forename: Sumeet
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Department of Physics, Motilal Nehru National Institute of Technology, Allahabad 211004, India. Electronic address: animesh198@gmail.com.
authors.forename: Animesh K
authors.initials: AK
authors.lastname: Ojha
authors.affiliation: Department of Physical Chemistry, University of Duisburg-Essen, D-45141, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Walkenfort
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D002384:Catalysis; D006108:Graphite / Q000737:chemistry*; D008751:Methylene Blue / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D055668:Photochemical Processes; D013059:Spectrum Analysis, Raman; D014466:Ultraviolet Rays
chemical_list: D019187:Cadmium Compounds; D010087:Oxides; C029663:cadmium oxide; D006108:Graphite; D008751:Methylene Blue
keywords: CdO nanoparticles; Photocatalysts; RTFM; Raman; rGO-CdO nanocomposites