| Full text | |
| Author(s): |
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
|
| Affiliation: | [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 |
| Abstract | |
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: | 07/55723-6 - Nanoparticulas de aluminas e silica dopadas com luminoforos, funcionalizadas e biocompativeis com potencial aplicacao como marcadores luminescentes em biotecnologia. |
| Grantee: | José Maurício Almeida Caiut |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 11/21551-0 - Bio-compatible luminescent nanoparticles: synthesis, characterization and applications |
| Grantee: | José Maurício Almeida Caiut |
| Support Opportunities: | Regular Research Grants |