Enhanced photodegradation activity of ZnO:Eu³⁺and ZnO:Eu³⁺@Au 3D hierarchical structures

更新时间:2023-05-28

【摘要】In this work the flower-like hierarchical structures（HS） based on 3 D 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 6 G） 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 3 D 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 6 G.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.

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