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Detailed Characterization of Surface Ln-Doped Anatase TiO2 Nanoparticles by Hydrothermal Treatment for Photocatalysis and Gas Sensing Applications

Published online by Cambridge University Press:  01 June 2015

Rezwanur Rahman ,
Sean T. Anderson ,
Sonal Dey  and
Robert A. Mayanovic
Rezwanur Rahman
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, 901 South National Avenue, Springfield, MO 65897
Sean T. Anderson
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, 901 South National Avenue, Springfield, MO 65897
Sonal Dey
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, 901 South National Avenue, Springfield, MO 65897
Robert A. Mayanovic
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, 901 South National Avenue, Springfield, MO 65897
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Abstract

Nanostructured anatase TiO2 is a promising material for gas sensing and photocatalysis. In order to modify its catalytic properties, the lanthanide (Ln) ions Eu3+, Gd3+, Nd3+ and Yb3+ were precipitated on the surface of TiO2 nanoparticles (NPs) by hydrothermal treatment. Results from Raman spectroscopy and X-ray diffraction (XRD) measurements show that the anatase structure of the TiO2 nanoparticles was preserved after hydrothermal treatment. SEM and TEM show a heterogeneous distribution in size and a nanocrystallite morphology of the TiO2 NPs (∼ 14 nm in size) and EDX confirmed the presence of the Ln-ion surface doping after hydrothermal treatment. An increase in photoluminescence (PL) was observed for the Ln-surface-doped TiO2 NPs when measurements were made in forming gas (5% H2 + 95% Ar) at 520 °C. In contrast, the PL measurements made at room temperature did not show any noticeable difference in forming gas or in ambient air. Our temperature-dependent PL results obtained in different gas environments are consistent with modification of oxygen-vacancies and hole-defects due to a combination of hydrothermal treatment and surface Ln-doping.

Keywords

hydrothermallanthanideRaman spectroscopy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1806: Symposium UU – Titanium Oxides―From Fundamental Understanding to Applications , 2015 , pp. 25 - 30
Copyright
Copyright © Materials Research Society 2015 

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