| Texto completo | |
| Autor(es): |
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]
Número total de Autores: 8
|
| Afiliação do(s) autor(es): | [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
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Physical Chemistry C; v. 122, n. 15, p. 8667-8679, APR 19 2018. |
| Citações Web of Science: | 15 |
| Resumo | |
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) | |
| Processo FAPESP: | 17/07240-8 - Atividade catalítica do nanotubo de TiO2 no processo de decomposição da água |
| Beneficiário: | Amanda Fernandes Gouveia |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |
| 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: | 13/26671-9 - Estudo teórico-experimental de semicondutores multifuncionais |
| Beneficiário: | Amanda Fernandes Gouveia |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 12/14004-5 - Investigação das propriedades fotoluminescentes e fotocatalíticas de pós de BaWO4 e BaMoO4 puros e dopados com Mn, Cu e Zn |
| Beneficiário: | Júlio César Sczancoski |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |