Microwave-assisted and conventional sol-gel preparation of photocatalytically active ZnO/TiO2/glass multilayers

• Authors: Nina Kaneva , Irina Stambolova , Vladimir Blaskov , Alexander Eliyas , Sasho Vassilev
• Languages of publication: EN

Abstracts

EN

For the first time a combination of microwaves and/or the conventional treatment method was used to dry and heat multilayered sol-gel ZnO/TiO2/glass structures. Compact or porous TiO2 films were deposited as a bottom layer, covered with a ZnO film. The structures were characterized by X-ray Diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDX) and Scanning Electron Microscopy (SEM). Only peaks of wurtzite ZnO crystalline phase were registered on the X-Ray diffractograms. The microwave irradiation leads to a formation of poorly crystallized multilayers with very small crystallites and enhanced surface roughness. This results in a better photocatalytic activity of these structures than the structures of the samples treated conventionally. It was established that the morphology of the bottom titania layer affects the reaction of photocatalytic degradation of Malachite Green dye (MG). The structures with the compact bottom TiO2 films showed higher activities than those on porous TiO2 films. This study offers an energy saving method of producing ZnO/TiO2/glass multilayered structures of various morphologies and pronounced photocatalytic properties. The method does not involve any calcination step, normally applied to achieve a good degree of crystallization. This makes the method suitable for protecting substrates of low thermal stability. [...]

Keywords

EN

Microwaves; Amorphous thin films; Sol-gel; Photocatalysis

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2013
• Volume: 11
• Issue: 7
• Pages: 1055-1065

Dates

published

1 - 7 - 2013

online

26 - 4 - 2013

Contributors

author

Nina Kaneva

• Laboratory of Nanoparticle Science and Technology, Faculty of Chemistry and Pharmacy, University of Sofia, 1164, Sofia, Bulgaria

author

Irina Stambolova

• Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

author

Vladimir Blaskov

• Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

author

Alexander Eliyas

• Institute of Catalysis, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

author

Sasho Vassilev

• Institute of Electrochemistry and Energy Systems, Bulgarian Academy of Sciences, 1113, Sofia, Bulgaria

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Identifiers

DOI

10.2478/s11532-013-0240-5