Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1796
Title: Hydrothermal synthesis of highly crystalline nanotubes/nanoplates of pure and silver-doped anatase-titania using acid-catalyst-modified sol–gel precursors
Authors: Manu Jose
Mahitha, K
Remya, K
Shukla, S
Keywords: Sol–gel
Acid-catalyst
Ion-exchange
Nanocrystalline
Titania
Issue Date: 2015
Publisher: Springer
Citation: Journal of Sol-Gel Science and Technology 73(1):38-47;Jan 2015
Abstract: Highly crystalline nanotubes/nanoplates of pure and Ag-doped anatase-titania (TiO2) having high aspect-ratio have been synthesized, without the involvement of thermal treatment, via the hydrothermal method using the acetic-acidmodified sol–gel processed nanocrystalline pure and Agdoped anatase-TiO2 as precursors. The samples have been characterized for analyzing their morphology, structure, specific surface-area, and surface-chemistry using the transmission electron microscope, selected-area electron diffraction (SAED), X-ray diffraction, Brunauer–Emmett–Teller specific surface-area measurement, and Fourier transform infrared techniques. It has been observed that the hydrothermal treatment of acid-catyalyst-modified pure and Ag doped nanocrystalline anatase-TiO2 precursors and the subsequent washing of hydrothermal products result in the formation of nanotubes/nanoplates of pure and Ag-doped anatase-TiO2 instead of those of hydrogen titanate which is invariably obtained with the use of unmodified precursors. It has been proposed that the formation of nanotubes/nanoplates of pure and Ag-doped anatase-TiO2 via the hydrothermal method without the involvement of thermal treatment, under the given processing conditions, is due to the operation of double ion-exchange mechanism which is in contrast to that of conventional single ion-exchange mechanism responsible for the formation of nanotubes of hydrogen titanate. The operation of as-proposed double ion-exchange mechanism has been strongly supported by the experimentally observed variation in the solution-pH involved during the washing treatment of hydrothermal product.
URI: http://ir.niist.res.in:8080/jspui/handle/123456789/1796
ISSN: 0928-0707
Appears in Collections:2015

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