Effect of polyvinyl alcohol on the shape, photoluminescence and photocatalytic properties of PbMoO4 microcrystals

Autor(es)

Araujo, V. D. ^[1] ; Tranquilin, R. L. ^[2] ; Motta, F. V. ^[1] ; Paskocimas, C. A. ^[1] ; Bernardi, M. I. B. ^[3] ; Cavalcante, L. S. ^[4] ; Andres, J. ^[5] ; Longo, E. ^[2] ; Bomio, M. R. D. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio Grande Norte UFRN, LSQM Lab Sintese Quim Mat DEMat, BR-5907897 Natal, RN - Brazil

^[2] Univ Fed Sao Carlos UFSCar, LIEC, BR-13565905 Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Inst Fis Sao Carlos, USP, BR-13560970 Sao Carlos, SP - Brazil

^[4] Univ Estadual Piaui, Dept Quim, CCN, BR-64002150 Teresina, PI - Brazil

^[5] Univ Jaume 1, Dept Quim Fis & Analit, Castellon de La Plana 12071 - Spain

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING; v. 26, p. 425-430, OCT 2014.
• Citações Web of Science: 13

Resumo

For this study, lead molybdate (PbMoO4) microcrystals were prepared by the co-precipitation method and processed using a conventional hydrothermal method at 100 degrees C for 10 min with polyvinyl alcohol (PVA) as the capping agent. These microcrystals were structurally characterized by X-ray diffraction (XRD) and micro-Raman spectroscopy, and their morphology was investigated by field-emission gun scanning electron microscopy (FEG-SEM). The optical properties were analyzed by ultraviolet-visible (UV-vis) absorption spectroscopy and photoluminescence (PL) measurements. XRD patterns and MR spectrum indicate that the PbMoO4 microcrystals have a scheelite-type tetragonal structure. FE-SEM images reveal that the PVA promotes the aggregation of several octahedrons and the formation of large porous stake-like PbMoO4 microcrystals which are related to the oriented attachment growth process. Moreover, the effect of the capping agent hinders the growth of a large amount of micro-octahedrons which can be verified with by several nanocrystals on large crystals. Intense green PL emission was observed at room temperature for PbMoO4 microcrystals which are related to structural defects at medium range and intermediary energy levels between the valence band (VB) and the conduction band (CB). Photocatalytic activity was observed for PbMoO4 as a catalyst in the degradation of the rhodamine B (RhB) dye, achieving total degradation after 90 min under UV-light. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• 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