Europium Polyoxometalates Encapsulated in Silica Nanoparticles Characterization and Photoluminescence Studies

• Type: Article in International Scientific Journal
• Date: 2013

Authors

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

Journal

Title: European Journal of Inorganic Chemistry

Vol. 2013

Pages: 2877-2886

ISSN: 1434-1948

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 23 Citations

Scopus - 23 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10