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Superior Photostability and Photocatalytic Activity of ZnO Nanoparticles Coated with Ultrathin TiO2 Layers through Atomic-Layer Deposition

Authors
Sridharan, KishoreJang, EunyongPark, Young MinPark, Tae Joo
Issue Date
Dec-2015
Publisher
John Wiley & Sons Ltd.
Keywords
atomic-layer-deposition; core-shell structures; nanoparticles; photochemistry; rotary ALD
Citation
Chemistry - A European Journal, v.21, no.52, pp.19136 - 19141
Indexed
SCIE
SCOPUS
Journal Title
Chemistry - A European Journal
Volume
21
Number
52
Start Page
19136
End Page
19141
URI
https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/16131
DOI
10.1002/chem.201502876
ISSN
0947-6539
Abstract
Atomic-layer deposition (ALD) is a thin-film growth technology that allows for conformal growth of thin films with atomic-level control over their thickness. Although ALD is successful in the semiconductor manufacturing industry, its feasibility for nanoparticle coating has been less explored. Herein, the ALD coating of TiO2 layers on ZnO nanoparticles by employing a specialized rotary reactor is demonstrated. The photocatalytic activity and photostability of ZnO nanoparticles coated with TiO2 layers by ALD and chemical methods were examined by the photodegradation of Rhodamine B dye under UV irradiation. Even though the photo-catalytic activity of the presynthesized ZnO nanoparticles is higher than that of commercial P25 TiO2 nanoparticles, their activity tends to decline due to severe photocorrosion. The chemically synthesized TiO2 coating layer on ZnO resulted in severely declined photoactivity despite the improved photostability. However, ultrathin and conformal ALD TiO2 coatings (approximate to 0.75-1.5 nm) on ZnO improved its photostability without degradation of photocatalytic activity. Surprisingly, the photostability is comparable to that of pure TiO2, and the photocatalytic activity to that of pure ZnO.
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Park, Tae Joo
ERICA 공학대학 (DEPARTMENT OF MATERIALS SCIENCE AND CHEMICAL ENGINEERING)
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