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Effective optoelectronic and photocatalytic response of Eu3+-doped TiO2 nanoscale systems synthesized via a rapid condensation technique

Published online by Cambridge University Press:  22 May 2013

Nibedita Paul  and
Dambarudhar Mohanta
Nibedita Paul
Affiliation:
Department of Physics, Nanoscience and Soft Matter Laboratory, Tezpur University, Tezpur 784 028, Assam, India
Dambarudhar Mohanta*
Affiliation:
Department of Physics, Nanoscience and Soft Matter Laboratory, Tezpur University, Tezpur 784 028, Assam, India; and Department of Physics and School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
*
a)Address all correspondence to this author. e-mail: best@tezu.ernet.in, mohanta@seas.harvard.edu
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Abstract

In this work, we report on the optoelectronic and photocatalytic features of europium (Eu3+)-doped TiO2 nanoscale particles synthesized via a sol-gel mediated rapid-condensation technique. X-ray diffraction studies have revealed the mixed phases of the synthesized systems. In particular, a mixture of anatase, brookite, and rutile phases was found to coexist beyond a sintering temperature of 600 °C while a pure anatase phase was witnessed below 500 °C. The photoluminescence spectra of ∼7 nm sized anatase TiO2 nanoparticles have exhibited different intra 4f (Eu3+ ion related) transitions with the most intense red emission (5D0→7F2) peak located at ∼613 nm. The emissions due to color centers and oxygen vacancies of TiO2 were also evident in the PL spectra. The Brunauer-Emmett-Teller surface area analysis has revealed a significant increment of surface area and pore volume owing to the enhanced interfacial region introduced by point defects and dislocations due to Eu doping. The photocatalytic activity of the Eu3+ doped TiO2 nanoscale system was found to be ∼12% stronger than its un-doped counterpart, as assessed from the degradation of methyl orange (MO) solution under UV light irradiation. The percentage of degradation was found to be strongly dependent on the duration of the UV exposure and Eu doping concentration. As an efficient photosensitive candidate, rare earth sensitized TiO2 systems would bring new insights while displaying both optoelectronic and photocatalytic characteristics through use of the localized states present in the band gap of the host.

Keywords

78.67.Bf81.16.Hc81.20.Fw82.33.Ln
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 11 , 14 June 2013 , pp. 1471 - 1480
Copyright
Copyright © Materials Research Society 2013 

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References

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