resumo
We report a general method for the synthesis of metal oxide colloidal nanocrystals in sunflower oil using single-source precursors. In this research, iron oxide nanocrystals have been synthesized and characterized though this method can be extended to the synthesis of other common metal oxides such as ZnO and also to other types of vegetable oils as solvents. Using this method, nanoparticles with average diameters of 7 nm and 3 nm were obtained respectively for iron oxide and zinc oxide. The magnetic iron oxide phase was identified using powder XRD, surface enhanced Raman spectroscopy and magnetic measurements as maghemite as the main component. The magnetic measurements demonstrate the superparamagnetic behavior of the iron oxide nanoparticles. This synthetic approach is an interesting way to synthesize metal oxide nanocrystals in eco-friendly solvents of natural origin.
palavras-chave
PHOSPHINE-FREE SYNTHESIS; FT-RAMAN SPECTROSCOPY; CDSE NANOCRYSTALS; THERMAL-DECOMPOSITION; MAGNETIC-PROPERTIES; EDIBLE OILS; MONODISPERSE; MAGHEMITE; COMPLEX; GROWTH
categoria
Chemistry; Science & Technology - Other Topics; Materials Science; Physics
autores
Pereira, AS; Silva, NJO; Trindade, T; Pereira, S
nossos autores
Angela Sofia dos Santos Pereira
Bolseiro de pós-Doutoramento
Nuno João Silva
Investigador Principal
Sérgio Manuel de Sousa Pereira
Investigador principal
Tito Trindade
Professor Catedráticoagradecimentos
We thank Fundacao para a Ciencia e Tecnologia (FCT/FEDER) for the following grants: SFRH/BPD/44398/2008 and PTDC/CTM/101453/2008. NJOS acknowledges FCT for Ciencia 2008 program. The authors would like to acknowledge Dr Marta Ferro for microscopy analysis, which was supported by RNME-Pole University of Aveiro FCT Project REDE/1509/RME/2005.