Cerium molybdate nanocrystals: Microstructural, optical and gas-sensing properties

Autor(es)

Oliveira, Fernanda K. F. ^[1] ; Santiago, Anderson A. G. ^[1] ; Catto, Ariadne C. ^[2] ; da Silva, Luis F. ^[3] ; Tranquilin, Ricardo L. ^[2] ; Longo, Elson ^[2] ; Motta, V, Fabiana ; Bomio, Mauricio R. D. ^[4]

Afiliação do(s) autor(es)

^[1] Fed Univ Rio Grande do Norte UFRN, LSQM Lab Chem Synth Mat, Dept Mat Engn, POB 1524, Natal, RN - Brazil

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

^[3] Univ Fed Sao Carlos, Lab Nanostruct Multifunct Mat, BR-13565905 Sao Carlos, SP - Brazil

^[4] Motta, Fabiana, V, Fed Univ Rio Grande do Norte UFRN, LSQM Lab Chem Synth Mat, Dept Mat Engn, POB 1524, Natal, RN - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 857, MAR 15 2021.
• Citações Web of Science: 2

Resumo

Metal molybdate compounds have attracted considerable attention due to their technological applications. Herein, we demonstrate the controllable synthesis of cerium molybdate (Ce-2(MoO4)(3)) nanocrystals via the co-precipitation method followed by microwave-assisted hydrothermal (MAH) treatment at 150 degrees C during different times (15, 30 and 60 min). The effect of MAH treatment time on the microstructural, optical, and ozone gas-sensing properties of these nanocrystals was investigated. X-ray diffraction (XRD) and Raman spectroscopy measurements revealed that the samples presented a single-crystalline phase with scheelite-type tetragonal structure. Field emission gun scanning electron microscopy (FEG-SEM) images showed that the MAH conditions favored changes in the Ce-2(MoO4)(3) nanocrystal morphology. Photoluminescence (PL) measurements indicated a significant enhancement of PL emission with MAH time, suggesting an increase in the intrinsic defects formed during the MAH treatment. The gas-sensing performance of cerium molybdate nanocrystals towards sub-ppm ozone levels was also investigated. The experiments revealed complete recovery and good repeatability as well as good sensor response, which was improved in the sample synthesized at longer MAH time. (C) 2020 Published by Elsevier B.V. (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
• Processo FAPESP: 17/12437-5 - Preparação e caracterização de nanoheterojunções semicondutoras aplicadas como sensores resistivos de gás fotoativados
• Beneficiário: Luís Fernando da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular