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Synthesis and Optical Properties of Bi3+ Doped NaTaO3 Nano-Size Photocatalysts

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Abstract:

Well-crystallized NaTaO3 nanoparticles doped with and without Bi were synthesized by a hydrothermal method. X-ray diffraction (XRD) patterns showed a systematic shift toward lower angles, which was followed by broadened peaks as the dopant content of Bi3+ increased. The doping of Bi3+ in NaTaO3 was also found to give rise to finer particle sizes. For undoped samples, transmission electron microscopy (TEM) showed the well-crystallized cubic morphology, which however, changed to fairly rough surfaces and somewhat irregular distorted cube-like shaped geometries with the addition of Bi3+. The swelling of the crystallized cell volume was demonstrated by the increased lattice d-spacing from high-resolution transmission electron microscopy (HRTEM) studies. The diffuse reflection spectra showed a red shift in absorbance wavelength with Bi3+ doping, which suggests a decreased band gap energy. Emissions of the TaO6 octahedra unit were observed at 435 nm in the photoluminescence (PL) spectra. The PL intensities increased with the doping content of Bi3+, which was attributed to the increase of oxygen vacancies caused by the substitution of Ta5+ by Bi3+. The photocatalytic degradation of methylenebluechloride was taken as the model reaction to examine the activity of the sample. It was found that the activity decreased with the Bi3+ content.

Keywords: BAND GAP; HYDROTHERMAL METHOD; LUMINESCENCE; NATAO3; PHOTOCATALYTIC

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2122

Publication date: March 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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