Enhancement of the photocatalytic activity and white emission of CaIn2O4 nanocrystals

Autor(es)

Tavares, M. T. S. ^[1] ; Melo, M. M. ^[2] ; Araujo, V. D. ^[3] ; Tranquilin, R. L. ^[4] ; Almeida, C. R. R. ^[4] ; Paskocimas, C. A. ^[4] ; Bomio, M. R. D. ^[4] ; Longo, E. ^[5] ; Motta, F. V. ^[4]

Afiliação do(s) autor(es)

^[1] IFBA, BR-44096486 Salvador, BA - Brazil

^[2] IFRN, BR-59200000 Santa Cruz, RN - Brazil

^[3] Univ Fed Rural Pernambuco, UACSA, BR-52171900 Recife, PE - Brazil

^[4] Univ Fed Rio Grande do Norte, DEMAT, LSQM, BR-59078900 Natal, RN - Brazil

^[5] Univ Fed Sao Carlos, LIEC, DQ, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 658, p. 316-323, FEB 15 2016.
• Citações Web of Science: 6

Resumo

CaIn2O4 (CIO) nanocrystals (NCs) were prepared by ultrasonic spray pyrolysis at 1223 K without the use of surfactants to investigate the influences of the nanostructure on the photoluminescence and photocatalytic properties of this white-light emitter. The optical properties were analyzed by ultraviolet evisible (UV-vis) absorption spectroscopy, which indicated a band gap energy of 3.83 eV, and photoluminescence (PL) measurements at room temperature that showed a broad and intense emission band. X-ray diffraction (XRD) analysis confirmed that the CIO NCs adopted the orthorhombic crystalline phase. Field-emission gun scanning electron microscopy (FEG-SEM) micrographs demonstrated the spherical morphology of the CIO NCs, comprising aggregates of several CIO NCs. Furthermore, the as-synthesized CIO NCs exhibited enhanced activity for the photodegradation of methylene blue (MB) under UV-vis irradiation. The chromaticity coordinates were calculated for the sample based on the PL spectrum; the CIO NCs had values of x = 0.31 and y = 0.38, and this point is located on the white region of the CIE diagram. Ultrasonic spray pyrolysis provides a feasible approach for preparing shape- and size-controlled CIO nanocrystals that hold great potential for photocatalytic applications and as photoluminescent white emitters. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/57872-1 - Instituto Nacional de Ciências dos Materiais em Nanotecnologia
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs