title: Structure and photoluminescence studies of CeO2·CuAlO2 mixed metal oxide fabricated by co-precipitation method.
abstract: A novel mixed metal oxide, CeO2·CuAlO2 was fabricated by co-precipitation method in aqueous medium. CeO2·CuAlO2 was characterized by XRD, SEM, EDS, TEM, FTIR and PL spectra. The optical properties of the nanoparticles were studied by photoluminescence (PL) spectra. PL spectra at different excitations were recorded. The composite showed emission in UV, visible and NIR region depending on the excitation wavelength. The special spectral feature observed for this composite is that it showed six emission bands at 364, 409, 434, 448, 465 and 481 nm when excited at 298 nm. The green and red emissions observed at 512 and 669 nm are originated from cubic CeO2 phase when excited at 450 nm. The PL spectra were found to be dependent on excitation wavelength violating Kasha's rule. The X-ray diffraction reveals a cubic CeO2 phase and hexagonal CuAlO2 phase. EDS spectra revealed the presence of cerium (Ce), copper (Cu), aluminum (Al) and oxygen (O) elements. The particle size of the CeO2·CuAlO2 mixed oxide was estimated using Scherrer's formula, which was found to be in the range of 17.2-34.2 nm. The TEM image showed particles are almost uniform size of approximately 15-50 nm with spherical morphology.
authors.affiliation: Department of Chemistry, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul 151-747, South Korea; Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh. Electronic address: subhan-che@sust.edu.
authors.forename: Md Abdus
authors.initials: MA
authors.lastname: Subhan
authors.affiliation: Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
authors.forename: Tanzir
authors.initials: T
authors.lastname: Ahmed
authors.affiliation: Department of Chemistry, Shah Jalal University of Science and Technology, Sylhet, Bangladesh.
authors.forename: M R
authors.initials: MR
authors.lastname: Awal
authors.affiliation: Department of Chemistry, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul 151-747, South Korea.
authors.forename: B Moon
authors.initials: BM
authors.lastname: Kim
mesh_terms: D002563:Cerium / Q000737:chemistry*; D011232:Chemical Precipitation; D008163:Luminescent Measurements / Q000379:methods*; D053761:Nanocomposites / Q000737:chemistry / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013052:Spectrometry, X-Ray Emission; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: C574001:CuAlO(2); D010087:Oxides; D002563:Cerium; C030583:ceric oxide
keywords: Composite oxide materials; Optical materials; Optical properties; Photoluminescence; Semiconductors