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Tuning the photoelectronic and photocatalytic properties of single-crystalline TiO nanosheet array films with dominant {001} facets by controlling the hydrochloric acid concentration.
- Source :
-
Journal of Materials Science . Jan2016, Vol. 51 Issue 2, p950-957. 8p. 2 Black and White Photographs, 1 Chart, 6 Graphs. - Publication Year :
- 2016
-
Abstract
- Single-crystalline TiO nanosheet array films with tunable percentage of exposed {001} facets were synthesized on FTO by a simple hydrothermal method. The effects of the hydrochloric acid concentration on morphology, crystal structure, and optical property have been investigated by scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, micro-Raman spectroscope system, and UV-Vis spectrophotometer. When the hydrochloric acid concentration increases from 4.8 to 5.2 mol/L, dense regular nanosheets tend to grow perpendicular to the substrate surface, and the percentage of exposed {001} facets is increasing from 76 to 84 %. Evolution of these nanosheet array films has accompanied by significant variations of photoelectronic and photocatalytic properties. The intensity of Raman peak E at 144 cm decreases, and the photocurrent increases when more proportion areas of {001} facets are exposed. The sample prepared at hydrochloric acid concentration of 4.8 mol/L shows the highest photocatalytic activity. This can be explained by the preferential carrier transport to different facets of the TiO crystal with tradeoff relation between the {101} and {001} facets, and a increasing of total catalytic sites. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 51
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 110953073
- Full Text :
- https://doi.org/10.1007/s10853-015-9424-z