Role of defects on the enhancement of the photocatalytic response of ZnO nanostructures

Autor(es)

Montero-Munoz, Marly ^[1] ; Ramos-Ibarra, J. E. ^[1] ; Rodriguez-Paez, Jorge E. ^[2] ; Teodoro, Marcio D. ^[3] ; Marques, Gilmar E. ^[3] ; Sanabria, Alfonso R. ^[4] ; Cajas, Paola C. ^[5] ; Paez, Carlos A. ^[6] ; Heinrichs, Benoit ^[6] ; Coaquira, Jose A. H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Brasilia, Inst Phys, BR-70910900 Brasilia, DF - Brazil

^[2] Univ Cauca, Dept Phys, Popayan, Cauca - Colombia

^[3] Univ Fed Sao Carlos, Dept Phys, BR-13565905 Sao Carlos, SP - Brazil

^[4] Univ Cauca, Dept Chem, Popayan, Cauca - Colombia

^[5] Univ Brasilia, Dept Mech Engn, BR-70910900 Brasilia, DF - Brazil

^[6] Univ Liege, Dept Chem Engn, Genie Chim Nanomat & Interfaces, Liege - Belgium

• Tipo de documento: Artigo Científico
• Fonte: Applied Surface Science; v. 448, p. 646-654, AUG 1 2018.
• Citações Web of Science: 11

Resumo

Zinc oxide (ZnO) nanostructures have been synthesized by a simple controlled precipitation method to study the effects of the type solvent - including water, acetic acid and ethylene glycol - on the formation of ZnO and on its photocatalytic activity for the decomposition of H2O2 in aqueous solution. Scanning electron microscopy (SEM) and synchrotron-based X-ray diffraction (XRD) were used to determine the morphology, crystallinity, and chemical composition of the ZnO structures. Raman spectroscopy and photoluminescence measurements were carried out to determine the nature of the defects present in the different ZnO nanostructures and how they affect the photocatalytic activity. Based on the results, we propose plausible growth mechanisms underlying the formation of ZnO with different morphology, according to the solvent used during the synthesis. A direct relation between the photocatalytic activity and the defects type was established, suggesting that defects play a vital role in modulating the photocatalytic response. (C) 2018 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 13/18719-1 - Dinâmica de portadores eletrônicos em nanoestruturas semicondutoras
• Beneficiário: Marcio Daldin Teodoro
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 14/19142-2 - Caracterização e processamento de nanoestruturas semicondutoras e aplicações como dispositivos
• Beneficiário: Gilmar Eugenio Marques
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/13771-0 - EMU concedido no processo 14/19142-2: criostato de ultra baixa vibração com campo magnético e microscópio confocal
• Beneficiário: Gilmar Eugenio Marques
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 14/07375-2 - EMU concedido no projeto 2013/18719-1: sistema de medidas resolvidas no tempo
• Beneficiário: Marcio Daldin Teodoro
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários