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Title: Titanate nanotube thin films with enhanced thermal stability and high-transparency prepared from additive-free sols

Abstract

Titanate nanotubes were synthesized from TiO{sub 2} in alkaline medium by a conventional hydrothermal method (150 Degree-Sign C, 4.7 bar). To obtain hydrogen titanates, the as-prepared sodium titanates were treated with either HCl or H{sub 3}PO{sub 4} aqueous solutions. A simple synthesis procedure was devised for stable titanate nanotube sols without using any additives. These highly stable ethanolic sols can readily be used to prepare transparent titanate nanotube thin films of high quality. The resulting samples were studied by X-ray diffraction, N{sub 2}-sorption measurements, Raman spectroscopy, transmission and scanning electron microscopy, X-ray photoelectron spectroscopy and spectroscopic ellipsometry. The comparative results of using two kinds of acids shed light on the superior thermal stability of the H{sub 3}PO{sub 4}-treated titanate nanotubes (P-TNTs). X-ray photoelectron spectroscopy revealed that P-TNTs contains P in the near-surface region and the thermal stability was enhanced even at a low ({approx}0.5 at%) concentration of P. After calcination at 500 Degree-Sign C, the specific surface areas of the HCl- and H{sub 3}PO{sub 4}-treated samples were 153 and 244 m{sup 2} g{sup -1}, respectively. The effects of H{sub 3}PO{sub 4} treatment on the structure, morphology and porosity of titanate nanotubes are discussed. - Graphical Abstract: TEM picture (left) showsmore » P-TNTs with diameters about 5-6 nm. Inset shows a stable titanate nanotube sol illuminated by a 532 nm laser beam. Due to the presence of the nanoparticles the way of the light is visible in the sol. Cross sectional SEM picture (right) as well as ellipsometry revealed the formation of optical quality P-TNT films with thicknesses below 50 nm. Highlights: Black-Right-Pointing-Pointer H{sub 3}PO{sub 4} treatment led to TNTs with high surface area even after calcination at 500 Degree-Sign C. Black-Right-Pointing-Pointer H{sub 3}PO{sub 4}-treated TNTs preserved their nanotube morphology up to 500 Degree-Sign C. Black-Right-Pointing-Pointer Stable TNT sols can be prepared by the peptization of TNT gels. Black-Right-Pointing-Pointer High-transparency TNT thin films of high quality were fabricated.« less

Authors:
 [1];  [1];  [1];  [2]; ; ;  [3];  [1]
  1. Supramolecular and Nanostructured Materials Research Group of the Hungarian Academy of Sciences, University of Szeged, Aradi vertanuk tere 1, H-6720 Szeged (Hungary)
  2. Department of Physical Chemistry and Materials Science, University of Szeged, Aradi vertanuk tere 1, H-6720 Szeged (Hungary)
  3. Institute for Technical Physics and Materials Science MFA, Research Center for Natural Sciences, Konkoly-Thege ut 29-33, H-1121 Budapest (Hungary)
Publication Date:
OSTI Identifier:
22131141
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 192; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CALCINATION; HYDROCHLORIC ACID; HYDROTHERMAL SYNTHESIS; NANOTUBES; PHOSPHORIC ACID; RAMAN SPECTROSCOPY; SCANNING ELECTRON MICROSCOPY; SOLS; STABILITY; THIN FILMS; TITANATES; TITANIUM OXIDES; VISIBLE RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Koroesi, Laszlo, Department of Biotechnology, Nanophage Therapy Center, Enviroinvest Corporation, Kertvaros utca 2, H-7632 Pecs, Papp, Szilvia, Department of Biotechnology, Nanophage Therapy Center, Enviroinvest Corporation, Kertvaros utca 2, H-7632 Pecs, Hornok, Viktoria, Oszko, Albert, Petrik, Peter, Patko, Daniel, Horvath, Robert, and Dekany, Imre. Titanate nanotube thin films with enhanced thermal stability and high-transparency prepared from additive-free sols. United States: N. p., 2012. Web. doi:10.1016/J.JSSC.2012.04.038.
Koroesi, Laszlo, Department of Biotechnology, Nanophage Therapy Center, Enviroinvest Corporation, Kertvaros utca 2, H-7632 Pecs, Papp, Szilvia, Department of Biotechnology, Nanophage Therapy Center, Enviroinvest Corporation, Kertvaros utca 2, H-7632 Pecs, Hornok, Viktoria, Oszko, Albert, Petrik, Peter, Patko, Daniel, Horvath, Robert, & Dekany, Imre. Titanate nanotube thin films with enhanced thermal stability and high-transparency prepared from additive-free sols. United States. https://doi.org/10.1016/J.JSSC.2012.04.038
Koroesi, Laszlo, Department of Biotechnology, Nanophage Therapy Center, Enviroinvest Corporation, Kertvaros utca 2, H-7632 Pecs, Papp, Szilvia, Department of Biotechnology, Nanophage Therapy Center, Enviroinvest Corporation, Kertvaros utca 2, H-7632 Pecs, Hornok, Viktoria, Oszko, Albert, Petrik, Peter, Patko, Daniel, Horvath, Robert, and Dekany, Imre. 2012. "Titanate nanotube thin films with enhanced thermal stability and high-transparency prepared from additive-free sols". United States. https://doi.org/10.1016/J.JSSC.2012.04.038.
@article{osti_22131141,
title = {Titanate nanotube thin films with enhanced thermal stability and high-transparency prepared from additive-free sols},
author = {Koroesi, Laszlo and Department of Biotechnology, Nanophage Therapy Center, Enviroinvest Corporation, Kertvaros utca 2, H-7632 Pecs and Papp, Szilvia and Department of Biotechnology, Nanophage Therapy Center, Enviroinvest Corporation, Kertvaros utca 2, H-7632 Pecs and Hornok, Viktoria and Oszko, Albert and Petrik, Peter and Patko, Daniel and Horvath, Robert and Dekany, Imre},
abstractNote = {Titanate nanotubes were synthesized from TiO{sub 2} in alkaline medium by a conventional hydrothermal method (150 Degree-Sign C, 4.7 bar). To obtain hydrogen titanates, the as-prepared sodium titanates were treated with either HCl or H{sub 3}PO{sub 4} aqueous solutions. A simple synthesis procedure was devised for stable titanate nanotube sols without using any additives. These highly stable ethanolic sols can readily be used to prepare transparent titanate nanotube thin films of high quality. The resulting samples were studied by X-ray diffraction, N{sub 2}-sorption measurements, Raman spectroscopy, transmission and scanning electron microscopy, X-ray photoelectron spectroscopy and spectroscopic ellipsometry. The comparative results of using two kinds of acids shed light on the superior thermal stability of the H{sub 3}PO{sub 4}-treated titanate nanotubes (P-TNTs). X-ray photoelectron spectroscopy revealed that P-TNTs contains P in the near-surface region and the thermal stability was enhanced even at a low ({approx}0.5 at%) concentration of P. After calcination at 500 Degree-Sign C, the specific surface areas of the HCl- and H{sub 3}PO{sub 4}-treated samples were 153 and 244 m{sup 2} g{sup -1}, respectively. The effects of H{sub 3}PO{sub 4} treatment on the structure, morphology and porosity of titanate nanotubes are discussed. - Graphical Abstract: TEM picture (left) shows P-TNTs with diameters about 5-6 nm. Inset shows a stable titanate nanotube sol illuminated by a 532 nm laser beam. Due to the presence of the nanoparticles the way of the light is visible in the sol. Cross sectional SEM picture (right) as well as ellipsometry revealed the formation of optical quality P-TNT films with thicknesses below 50 nm. Highlights: Black-Right-Pointing-Pointer H{sub 3}PO{sub 4} treatment led to TNTs with high surface area even after calcination at 500 Degree-Sign C. Black-Right-Pointing-Pointer H{sub 3}PO{sub 4}-treated TNTs preserved their nanotube morphology up to 500 Degree-Sign C. Black-Right-Pointing-Pointer Stable TNT sols can be prepared by the peptization of TNT gels. Black-Right-Pointing-Pointer High-transparency TNT thin films of high quality were fabricated.},
doi = {10.1016/J.JSSC.2012.04.038},
url = {https://www.osti.gov/biblio/22131141}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 192,
place = {United States},
year = {Wed Aug 15 00:00:00 EDT 2012},
month = {Wed Aug 15 00:00:00 EDT 2012}
}