51. Enhanced photodegradation activity of ZnO:Eu3+ and ZnO:Eu3+@Au 3D hierarchical structures
- Author
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Patryk Florczak, Barbara Peplińska, Marcin Jarek, Stefan Jurga, Nataliya Babayevska, and Igor Iatsunskyi
- Subjects
Photoluminescence ,Materials science ,Scanning electron microscope ,Doping ,Nanoparticle ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Rhodamine 6G ,chemistry.chemical_compound ,chemistry ,Geochemistry and Petrology ,Photocatalysis ,0210 nano-technology ,Photodegradation ,Luminescence ,Nuclear chemistry - Abstract
In this work the flower-like hierarchical structures (HS) based on 3D pristine ZnO, ZnO:Eu3+ and ZnO:Eu3+@Au were successfully obtained by a template-free solvothermal and deposition-precipitation method. The decolorization/photodegradation of these structures towards model organic dye (rhodamine 6G) was studied. The synthesized ZnO-based HS were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis and photoluminescence (PL) spectroscopies. The proposed synthesis approaches allow to obtain highly crystalline 3D ZnO, ZnO:Eu3+ and ZnO:Eu3+@Au composites. Results of scanning microscopy show that ZnO flower-like HS are assemblies from smaller components, forming larger ones, the whole ZnO structure was approximately 3 μm. Au nanoparticles (size ∼ 10 nm) are successfully deposited on ZnO HS surface. Luminescent studies show that ZnO is an ideal matrix for incorporation of Eu3+ ions in broad concentration range (Eu3+ = 1.0 at%–5.0 at%) with an efficient red luminescence. The strong UV emission in ZnO, as well as ZnO:Eu3+ HS is observed under 325 nm excitation. Doping of ZnO HS matrix by Eu3+ ions leads to the red shift of deep level emission peak (DLE). The PL intensity reaches the maximum up to 5 at% Eu3+. The photocatalytic properties of ZnO and ZnO:Eu3+@Au HS were investigated under UV–Vis light irradiation towards rhodamine 6G. The obtained results demonstrate the synergetic effect of the deposited gold nanoparticles and Eu3+ doping on photocatalytic activity of ZnO:Eu3+@Au HS in comparison to pristine ZnO and ZnO:Eu3+ HS.
- Published
- 2020