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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Luminescent Terbium Doped Aluminate Particles: Properties and Surface Modification with Asparagine

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Caiut, Jose M. A. [1, 2] ; Messaddeq, Younes [1] ; Dexpert, Herve [2] ; Verelst, Marc [2] ; Ribeiro, Sidney J. L. [1] ; Dexpert-Ghys, Jeannette [2]
Total Authors: 6
[1] Univ Estadual Paulista UNESP, Inst Quim, BR-14801970 Araraquara, SP - Brazil
[2] CNRS, Ctr Mat Elaborat & Struct Studies, F-31055 Toulouse 4 - France
Total Affiliations: 2
Document type: Journal article
Source: Journal of the Brazilian Chemical Society; v. 26, n. 12, p. 2536-2544, DEC 2015.
Web of Science Citations: 0

New luminescent organic-inorganic hybrid particles based on Tb-doped aluminates and asparagine (Asn) surface modifiers were investigated. The Tb3+ doped inorganic core was obtained by spray pyrolysis, at 200 ºC γ-AlOOH (BOE:Tbx%) or at 700 ºC γ-Al2O3 (γTA:Tbx%). The reaction of Asn with boehmite in water disaggregated the sub-micronic boehmite particles to give stable dispersion of surface modified nanoparticles Asn:BOE:Tbx% (x = 1 or 5). Concerning the Asn:γTA:Tbx% system, an Asn film wrapping alumina particles was observed. Photoluminescence spectra exhibited the bands assigned to Tb3+5D4 → 7FJ = 6-3 transitions. A broad absorption band (240 nm) was assigned to the host (aluminate) to ion (Tb3+) energy transfer. Efficient energy transfer was observed when active ions are incorporated in the defect-spinel structure of γTA, whereas it was relatively weak for BOE:Tb where Tb3+ are bonded to the hydroxyls groups at nanocrystals surface. It is noticeable that Asn strengthens the linkage of Tb3+ with the aluminate matrix, enhancing the host to dopant energy transfer. (AU)

FAPESP's process: 11/21551-0 - Bio-compatible luminescent nanoparticles: synthesis, characterization and applications
Grantee:José Maurício Almeida Caiut
Support Opportunities: Regular Research Grants