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

• Autorzy: Nina Kaneva , Irina Stambolova , Vladimir Blaskov , Alexander Eliyas , Sasho Vassilev
• Języki publikacji: EN

Abstrakty

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. [...]

Słowa kluczowe

EN

Microwaves; Amorphous thin films; Sol-gel; Photocatalysis

• Czasopismo: Open Chemistry
• Rocznik: 2013
• Tom: 11
• Numer: 7
• Strony: 1055-1065

Daty

wydano

2013-07-01

online

2013-04-26

Twórcy

autor

Nina Kaneva

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

autor

Irina Stambolova

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

autor

Vladimir Blaskov

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

autor

Alexander Eliyas

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

autor

Sasho Vassilev

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

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Identyfikatory

DOI

10.2478/s11532-013-0240-5