Europium Polyoxometalates Encapsulated in Silica Nanoparticles Characterization and Photoluminescence Studies

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

Cristina S Neves (Autor) Outra; Carlos M Granadeiro (Autor) FCUP; Luis Cunha Silva (Autor) Outra; Duarte Ananias (Autor) Outra; Sandra Gago (Autor) Outra; Gabriel Feio (Autor) Outra; Patricia A Carvalho (Autor) Outra; Peter Eaton (Autor) Outra; Salete S Balula (Autor) Outra; Eulalia Pereira (Autor) FCUP

Revista

Título: European Journal of Inorganic Chemistry

Vol. 2013

Páginas: 2877-2886

ISSN: 1434-1948

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 23 Citações

Scopus - 23 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-005-08G

DOI: 10.1002/ejic.201201482

Abstract (EN): The incorporation of europium polyoxometalates into silica nanoparticles can lead to a biocompatible nanomaterial with luminescent properties suitable for applications in biosensors, biological probes, and imaging. Keggin-type europium polyoxometalates Eu(PW11)x (x = 1 and 2) with different europium coordination environments were prepared by using simple methodologies and no expensive reactants. These luminescent compounds were then encapsulated into silica nanoparticles for the first time through the water-in-oil microemulsion methodology with a nonionic surfactant. The europium polyoxometalates and the nanoparticles were characterized by using several techniques [FTIR, FT-Raman, 31P magic angle spinning (MAS) NMR, and TEM/energy-dispersive X-ray spectroscopy (TEM-EDS), AFM, dynamic light scattering (DLS), and inductively coupled plasma MS (ICP-MS) analysis]. The stability of the material and the integrity of the europium compounds incorporated were also examined. Furthermore, the photoluminescence properties of the Eu(PW11)x@SiO2 nanomaterials were evaluated and compared with those of the free europium polyoxometalates. The silica surface of the most stable nanoparticles was successfully functionalized with appropriate organosilanes to enable the covalent binding of oligonucleotides.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10