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Title: Investigation on the structural and nonlinear optical properties of Pt doped TiO{sub 2} nanoparticles

Graphical abstract: The open aperture Z-scan traces of Pt doped TiO{sub 2} nanoparticles at different Pt concentrations were carried out at an irradiation wavelength of 532 nm. It was numerically found that, two photon absorption (TPA) type process gives the best fit to the obtained open aperture Z-scan data. The nonlinear transmission was found to be of third order as it fits to a two-photon absorption. The optical limiting performances of nanoparticles were greatly enhanced with increased volume ratio of Pt. Increasing particle size reduced the limiting threshold and enhanced the optical limiting performance. - Highlights: • Pt doped TiO{sub 2} nanoparticles with different concentrations of Pt have been synthesized by sol–gel method. • The average fluorescence lifetime decreases as the volume fraction of Pt dopant increases. • The effects of Pt content on the optical limiting property were investigated by open aperture Z-scan measurements done at 532 nm using 5 ns laser pulses. • The values of the third-order nonlinearities of nanoparticles are interesting from the application point of view which could be used as a potential candidate for the application of nonlinear optical device. - Abstract: Pt doped TiO{sub 2} nanoparticles with different concentrations of Pt were preparedmore » by sol–gel method. X-ray diffraction (XRD) study reveals that the samples have a homogeneous anatase phase tetragonal system and the lattice parameter analysis indicates that Pt ions substitute into the lattice of TiO{sub 2}. The addition of dopant increases the growth of TiO{sub 2} grains, agglomerates them and shifts the absorption band of TiO{sub 2} from ultraviolet to visible region. The incorporation of Pt in TiO{sub 2} is also confirmed by fluorescence quenching and the fluorescence lifetime decreases as the volume fraction of Pt dopant increases. Open aperture Z-scan measurements done at 532 nm using 7 ns laser pulses show nonlinear absorption which arises from an effective two photon absorption process. The nonlinear optical properties are characterized by using fluence dependent transmittance measurements in order to reveal the optical limiting effects. It is found that the optical limiting performances of nanoparticles were greatly enhanced with increased concentration of Pt.« less
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. Department of Chemistry, SRM Valliammai Engineering College, Kattankulathur, Chennai (India)
  2. Department of Physics, Anna University, Chennai (India)
  3. Department of Physics, VIT University, Chennai (India)
Publication Date:
OSTI Identifier:
22341746
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 48; Journal Issue: 9; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; DOPED MATERIALS; FLUORESCENCE; IRRADIATION; LATTICE PARAMETERS; NANOPARTICLES; NANOSTRUCTURES; OPTICAL PROPERTIES; PARTICLE SIZE; PHOTONS; PULSES; SOL-GEL PROCESS; TITANIUM OXIDES; WAVELENGTHS; X-RAY DIFFRACTION