Optical and photocatalytic properties of rare earth metal-modified ZnO quantum dots

Jakub Sowik , Magdalena Miodyńska , Beata Bajorowicz , Alicja Mikołajczyk , Wojciech Lisowski , Tomasz Klimczuk , Daniel Kaczor , Adriana Zaleska-Medynska , Anna Malankowska

Abstract

A series of novel ZnO quantum dots modified with rare earth metals was successfully prepared by a simple sol-gel approach. The effects of types (Eu, Er, Tb, Yb, Ho, La) and amounts (from 0.09 to 0.45 mmol) of lanthanides on the optical properties, structural characterization and photocatalytic activity of ZnO/RE QDs were systematically investigated. The X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) with energy dispersive X-ray analysis (EDX) and UV–Vis diffuse reflectance spectroscopy were used to characterize surface properties, while photoluminescence (PL) emission spectroscopy and UV–Vis-driven degradation of phenol in aqueous phase were applied to understand optical and photocatalytic properties. The experiments demonstrated that generally modification of ZnO QDs by lanthanides resulted in increase of photoactivity while photoluminesce decrease at the same moment. The highest photocatalytic activity among all obtained nanomaterials and the lowest photoluminescence quantum yield among ZnO/Er photocatalysts were observed for ZnO QDs modified with 0.09 mmol of erbium. Increased photocatalytic activity has been shown in successive samples: ZnO/0.09_Er > ZnO/0.18_Eu > ZnO/0.09_La > ZnO/0.27_Er > ZnO/0.18_Tb > pristine ZnO QDs. The experimental results were supported by calculations based on density functional theory (DFT) which revealed atomic and electronic structure of Er/La modified ZnO QDs.
Author Jakub Sowik (FCh / DET / LPh)
Jakub Sowik,,
- Laboratory of Photocatalysis
, Magdalena Miodyńska (FCh / DET / LPh)
Magdalena Miodyńska,,
- Laboratory of Photocatalysis
, Beata Bajorowicz (FCh / DET / LPh)
Beata Bajorowicz,,
- Laboratory of Photocatalysis
, Alicja Mikołajczyk (FCh / DET / LPh)
Alicja Mikołajczyk,,
- Laboratory of Photocatalysis
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Tomasz Klimczuk
Tomasz Klimczuk,,
-
, Daniel Kaczor
Daniel Kaczor,,
-
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
, Anna Malankowska (FCh / DET / LPh)
Anna Malankowska,,
- Laboratory of Photocatalysis
Journal seriesApplied Surface Science, ISSN 0169-4332, (A 35 pkt)
Issue year2019
Vol464
Pages651-663
Publication size in sheets0.6
Keywords in Englishquantum dots, ZnO QDs, rare earth metal, photocatalysis, photoluminescence
DOIDOI:10.1016/j.apsusc.2018.09.104
URL https://doi.org/10.1016/j.apsusc.2018.09.104
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 35.0, 25-09-2018, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 25-09-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.387 (2) - 2016=3.184 (5)
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