The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate
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Títol
The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrateAutoria
Data de publicació
2020-11-01Editor
ElsevierISSN
0169-4332Cita bibliogràfica
A. C. Catto, M: M. Ferrer, O. F. Lopes, V.R. Mastelaro, J. Andrés, L. F. da Silva, E. Longo, W. Avansi. The role of counter-ions in crystal morphology, surface structure and photocatalytic activity of ZnO crystals grown onto a substrate. Applied Surface Science, 529 (2020), 147057Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://www.sciencedirect.com/science/article/pii/S0169433220318146Versió
info:eu-repo/semantics/submittedVersionParaules clau / Matèries
Resum
In this contribution, we present an experimental and theoretical investigation of the role of counter-ions in the crystal morphology, surface structure, and photocatalytic activity of hierarchical ZnO nanostructures. ... [+]
In this contribution, we present an experimental and theoretical investigation of the role of counter-ions in the crystal morphology, surface structure, and photocatalytic activity of hierarchical ZnO nanostructures. The effect of zinc precursor (nitrate, acetate and, sulfate) along the synthesis of ZnO nanostructures grown directly onto a substrate by means of a simple hydrothermal method was analyzed in detail. Scanning electron microscopy images showed a preferential growth of ZnO nanostructures along the c-axis, with a slight reduction in the orientation depending on the choice of the Zn source. Theoretical calculations based on the Wulff theory allowed us to better understand the morphological changes and directly relate the photocatalytic performance at the different exposed surfaces of the as-observed crystal shapes. Our results showed that photocatalytic activities in the discoloration of organic dyes became superior for hierarchical ZnO nanostructures obtained from zinc nitrate. This finding was explained by X-ray photoelectron and photoluminescence spectroscopies, which revealed that in addition to, the attached counter-ions and the abundance of carboxylate groups and organic residuals on ZnO surfaces, the presence of surface defects are determinant to enhance the photocatalytic performance of the material. [-]
Publicat a
Applied Surface Science, 2020, vol. 529Proyecto de investigación
National Council for Scientific and Technological Development (CNPq); 405140/2018-5, 426511/2018-2, 311463/2017-7, 432242/2018-0; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP): 2018/18208-0, 2017/12437-5, 2013/07296-2, 2012/15170-6, 2013/13888-0; CAPES: 001; Brazilian Nanotechnology National Laboratory, LNNano, Campinas, SP, Brazil: XPS-18304; Ministerio de Ciencia, Innovacion y Universidades (Spain): PGC2018-094417-B-I00; Universitat Jaume I: UJI-B2019-30; CAPES: 88881.368050/2019-01Drets d'accés
Copyright © Elsevier B.V.
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