Synthesis of Nd3+ Doped TiO2 Nanoparticles and Its Optical Behaviour

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Mechanics, Materials Science & Engineering, May 2017

ISSN 2412-5954

Synthesis of Nd3+ Doped TiO2 Nanoparticles and Its Optical Behaviour21 Ezhil Arasi S.1,a, Victor Antony Raj M.1, Madhavan J.1 1

Department of Physics, Loyola College, Chennai-34, India

a

jmadhavang@gmail.com DOI 10.2412/mmse.21.46.481 provided by Seo4U.link

Keywords: sol-gel method, optical studies, energy transfer.

ABSTRACT. Pure and Rare earth ion doped TiO 2 nanoparticles were synthesized by Sol-gel method. The synthesized TiO2 nanoparticles were characterized by X-ray diffraction, Raman spectroscopy, UV Vis spectroscopy and photoluminescence emission spectra. From the UV-visible measurement, the absorption edge of Nd 3+-TiO2 was shifted to a higher wavelength side with decreasing band gap. Photoluminescence emission studies reveal the energy transfer mechanism of Nd 3+ doped TiO2 nanoparticles explain.

Introduction. In the recent years, remarkable progress has been achieved in synthesis and characterization of titanium dioxide (TiO2) nanostructures due to their unique physical and chemical properties leading to extensive use as sensing materials, photo catalyst, H2 storage, and electrode materials [1]. Compounds doped with rare earth ions have received considerable interest in both fundamental and application studies due to their significant technological importance and are used as high performance luminescent devices, solar cells, solid-state lasers, time-resolved fluorescence labels for biological detection and other functional applications. As a host material, TiO2 is considered as a promising semiconductor with outstanding optical properties [2]. Due to wide band gaps, TiO2 is an important applicant for UV light absorption, and is almost transparent for infrared (IR) and visible light. It is a known fact that when dopants are added to a semiconductor they introduce band gap states inside the band gap and these mid-states act as luminescent centers or nonradiative traps. Because of the effective emission in the visible and near IR region, doping of TiO2 with rare earth elements has attracted much attention [3]. Synthesis of TiO2 nanoparticles. Pure and doped TiO2 samples were synthesized by a sol-gel method. 5ml of Titanium (IV) isopropoxide was added drop wise under vigorous stirring into 30ml of isopropanol. This mixture was added drop wise into 30ml of distilled water under stirring. The final pH was adjusted with an aqueous solution of ammonia. The mixture was left for 24 hours at room temperature to complete the hydrolysis. The precipit resultant white powder was milled. The obtained samples were centrifuged in distilled water and The metal ion doped TiO2 nanoparticles were synthesized using the same technique as described above. The Nd compound of Nd2O3 was used as a dopant source. Result and Discussion: X-Ray Diffraction Study. The synthesized TiO2 nanoparticles were characterized by a X-ray Diffractometer with monochromatic CuK ( range 20 70 by step scanning with a step size of 0.05 . The strongest peak for the anatase (101) phase of TiO2 was used to determine the average size of the metal oxide nanocrystallites 21

The Authors. Published by Magnolithe GmbH. This is an open access article under the CC BY-NC-ND license http://creativecommons.org/licenses/by-nc-nd/4.0/

MMSE Journal. Open Access www.mmse.xyz

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