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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Enhancement of the photocatalytic activity and white emission of CaIn2O4 nanocrystals

Full text
Author(s):
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]
Total Authors: 9
Affiliation:
[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
Total Affiliations: 5
Document type: Journal article
Source: Journal of Alloys and Compounds; v. 658, p. 316-323, FEB 15 2016.
Web of Science Citations: 6
Abstract

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)

FAPESP's process: 08/57872-1 - National Institute for Materials Science in Nanotechnology
Grantee:Elson Longo da Silva
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC