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Title: Synthesis and characterization of Fe{sub 3}O{sub 4}–TiO{sub 2} core-shell nanoparticles

Composite core-shell nanoparticles may have morpho-structural, magnetic, and optical (photoluminescence (PL)) properties different from each of the components considered separately. The properties of Fe{sub 3}O{sub 4}–TiO{sub 2} nanoparticles can be controlled by adjusting the titania amount (shell thinness). Core–shell nanoparticles were prepared by seed mediated growth of semiconductor (TiO{sub 2}) through a modified sol-gel process onto preformed magnetite (Fe{sub 3}O{sub 4}) cores resulted from the co-precipitation method. The structure and morphology of samples were characterized by X-ray diffraction, transmission electron microscopy (TEM), and high resolution-TEM respectively. X-ray photoelectron spectroscopy was correlated with ICP-AES. Magnetic measurements, optical absorption spectra, as well as PL spectroscopy indicate the presence of a charge/spin transfer from the conduction band of magnetite into the band gap of titania nanocrystals. The process modifies both Fe{sub 3}O{sub 4} and TiO{sub 2} magnetic and optical properties, respectively.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4]
  1. National Institute for R and D of Isotopic and Molecular Technology, 67–103 Donat St., 400295 Cluj-Napoca (Romania)
  2. University of Agricultural Sciences and Veterinary Medicine, 3-5 Calea Mănăştur, 400372 Cluj-Napoca (Romania)
  3. INCDO-INOE 2000, Research Institute for Analytical Instrumentation, 65 Donat St., 400293 Cluj-Napoca (Romania)
  4. Institute of Materials Jean Rouxel, 2 rue de la Houssière, P.O. Box 32229, 44322 Nantes Cedex 3 (France)
Publication Date:
OSTI Identifier:
22306018
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; AUGER ELECTRON SPECTROSCOPY; COPRECIPITATION; CRYSTAL GROWTH; FERRITES; IRON OXIDES; MAGNETITE; NANOPARTICLES; NANOSTRUCTURES; OPTICAL PROPERTIES; PHOTOLUMINESCENCE; RESOLUTION; SEMICONDUCTOR MATERIALS; SOL-GEL PROCESS; SPIN; SYNTHESIS; TITANIUM OXIDES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY