Influence of doping with Sm3+ on photocatalytic reuse of ZnO thin films obtained by spin coating

• Autor(a) principal: Andrade Neto,Nivaldo Freire de
• Data de Publicação: 2019
• Outros Autores: Carvalho,Raquel Guilherme de, Garcia,Laurênia Martins Pereira, Nascimento,Rubens Maribondo, Paskocimas,Carlos Alberto, Longo,Elson, Delmonte,Maurício Roberto Bomio, Motta,Fabiana Villela da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Matéria (Rio de Janeiro. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-70762019000400309
• topic: thermal degradation; wood; FTIR

ABSTRACT The difficulty in the powder reuse favors the study of materials in the form of thin films. ZnO based films have high photocatalytic potential. In this work, ZnO:xSm3+ (x = 0, 1, 2 and 4 %mol) thin films were prepared by spin coating method. The resins obtained to manufacture the thin films were prepared by complex polymerization method. The samples were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM), field emission scanning electron microscopy (FE-SEM) and spectroscopy UV-Vis. XRD patterns indicate that doping with 4%Sm forms Sm2O3 as the secondary phase. FE-SEM images of the cross section of thin films indicated a uniform thickness ranging from 354 to 367 nm between samples. The incorporation of Sm3+ ions in the ZnO lattice increases the Egap of the films. The photocatalytic performance of the films was tested with the photodegradation of methylene blue dye. Pure ZnO and ZnO:1%Sm3+ exhibited the best activity in the photodegradation. Thin films of pure ZnO exhibit the best photocatalytic results for the first cycle, but considerably reduce their efficiency with reuse. Sm3+ incorporation, without secondary phase formation, was efficient for the maintenance of the photocatalytic property after 3 cycles.