resumo
ZnO-ZnS-Ag2S ternary nanostructures were prepared by a simple and low-cost chemical precipitation method. The sample was characterised by X-ray diffraction, energy-dispersive X-ray, UV-Vis-NIR, Raman and Fourier transform infrared spectroscopy. Morphology of the sample was studied by scanning electron microscopy and it was observed that ZnO nanoplates were covered with ZnS and Ag2S nanoparticles. A high resolution transmission electron microscope was used to obtain further information about the crystalline domains of the prepared ternary nanostructure. The Kramers-Kronig method and classical dispersion theory were utilised to study the optical properties of the sample in the far-infrared region. Photocatalytic activity of the prepared samples was also attained in the gas solid phase by using a solar lamp (simulating outdoor lighting) and monitoring NOx degradation.
palavras-chave
ZNO-ZNS NANOCABLES; OPTICAL-PROPERTIES; HOLLOW SPHERES; THIN-FILMS; CORE-SHELL; NANOPARTICLES; NANOCRYSTALS; COMPOSITES; REMOVAL; DIOXIDE
categoria
Chemistry; Physics
autores
Zamiri, R; Ahangar, HA; Tobaldi, DM; Rebelo, A; Seabra, MP; Shabani, M; Ferreira, JMF
nossos autores
Avito Rebelo
Estudante de doutoramento
David Maria Tobaldi
Investigador
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)
Maria Paula Seabra
Professor Auxiliar
Mehdi Shabani
Bolseiro de pós-Doutoramento
Reza Zamiri
Bolseiro de pós-DoutoramentoGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G4 - Materiais Renováveis e Economia Circular
G5 - Materiais Biomiméticos, Biológicos e Vivos
agradecimentos
The author R. Zamiri would like to express his personal thanks to FCT (Fundacao para a Ciencia e a Tecnologia) for a post-doctoral research grant with reference number (SFRH/BPD/76185/2011). D. M. Tobaldi is grateful to the ECO-SEE project (funding from the European Union's Seventh Framework Programme for Research, Technological Development and Demonstration under grant agreement no. 609234. Note: The views expressed are purely those of the authors and may not, in any circumstances, be regarded as stating the official position of the European Commission). The support from CICECO is also acknowledged. Dr R. C. Pullar (University of Aveiro, Portugal) is kindly acknowledged for editing the English language of the manuscript.