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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.)

Surfactant-Mediated Morphology and Photocatalytic Activity of alpha-Ag2WO4 Material

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Author(s):
Macedo, Nadia G. [1] ; Gouveia, Amanda F. [1] ; Roca, Roman A. [1] ; Assis, Marcelo [1] ; Gracia, Lourdes [2] ; Andres, Juan [3] ; Leite, Edson R. [4] ; Longo, Elson [1]
Total Authors: 8
Affiliation:
[1] Univ Fed Sao Carlos, CDMF, LIEC, POB 676, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Valencia, Dept Phys Chem, E-46100 Burjassot - Spain
[3] Univ Jaume 1, Dept Analyt & Phys Chem, Castellon de La Plana 12071 - Spain
[4] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 122, n. 15, p. 8667-8679, APR 19 2018.
Web of Science Citations: 15
Abstract

In the present work, the morphology (hexagonal rod-like vs cuboid-like) of an alpha-Ag2WO4 solid-state material is manipulated by a simple controlled-precipitation method, with and without the presence of the anionic surfactant sodium dodecyl sulfate (SDS), respectively, over short reaction times. Characterization techniques, such as X-ray diffraction analysis, Rietveld refinement analysis, Fourier-transform (FT) infrared spectroscopy, FT Raman spectroscopy, UV-vis spectroscopy, transmission electron microscopy (TEM), high-resolution TEM, selected area electron diffraction, energy-dispersive X-ray spectroscopy, field emission-scanning electron microscopy (FE-SEM), and photoluminescence emission, are employed to disclose the structural and electronic properties of the a-Ag2WO4 material. First-principles calculations were performed to (i) obtain the relative stability of the six low-index surfaces of alpha-Ag2WO4; (ii) rationalize the crystal morphologies observed in FE-SEM images (using the Wulff construction); and (iii) determine the energy profiles associated with the transformation process between both morphologies induced by the presence of SDS. Finally, we demonstrate a relationship between morphology and photocatalytic activity, evaluated by photodegradation of Rhodamine B dye under UV light, based on the different numbers of unsaturated superficial Ag and W cations (local coordination, i.e., clusters) of each surface. (AU)

FAPESP's process: 17/07240-8 - Catalytic activity of the TiO2 nanotube in the water splitting process
Grantee:Amanda Fernandes Gouveia
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
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
FAPESP's process: 13/26671-9 - Theoretical and experimental study of multifunctional semiconductors
Grantee:Amanda Fernandes Gouveia
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 12/14004-5 - Investigation of the photoluminescence and photocatalytic properties of pure and Mn, Cu, and Zn-doped BaWO4 and BaMoO4 powders
Grantee:Júlio César Sczancoski
Support Opportunities: Scholarships in Brazil - Post-Doctoral