| Texto completo | |
| Autor(es): |
Santos, Joao A. O.
[1, 2, 3]
;
Mutti, Alessandra M. G.
[2, 3]
;
Bispo-Jr, Airton G.
;
Pires, Ana M.
[2, 3, 4]
;
Lima, Sergio A. M.
[3]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Sao Paulo State Univ, Inst Chem, UNESP, BR-14800900 Araraquara, SP - Brazil
[2] Sao Paulo State Univ, UNESP, Inst Biosci Humanities & Exact Sci, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil
[3] Sao Paulo State Univ, Sch Technol & Sci, UNESP, BR-19060900 Presidente Prudente, SP - Brazil
[4] Bispo-Jr, Jr., Airton G., Sao Paulo State Univ, Inst Chem, UNESP, BR-14800900 Araraquara, SP - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MATERIALS; v. 13, n. 23 DEC 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
Luminescent organic-inorganic hybrids containing lanthanides (Ln(3+)) have been prominent for applications such as luminescent bio-probes in biological assays. In this sense, a luminescent hybrid based on dense silica (SiO2) nanospheres decorated with Eu3+ beta-diketonate complexes using dibenzoylmethane (Hdbm) as a luminescent antenna was developed by using a hierarchical organization in four steps: (i) anchoring of 3-aminopropyltriethoxysilane (APTES) organosilane on the SiO2 surface, (ii) formation of a carboxylic acid ligand, (iii) coordination of Eu3+ to the carboxylate groups and (iv) coordination of dbm(-) to Eu3+. The hybrid structure was elucidated through the correlation of thermogravimetry, silicon nuclear magnetic resonance and photoluminescence. Results indicate that the carboxylic acid-Eu3+-dbm hybrid was formed on the surface of the particles with no detectable changes on their size or shape after all the four steps (average size of 32 +/- 7 nm). A surface charge of -27.8 mV was achieved for the hybrid, assuring a stable suspension in aqueous media. The Eu3+ complex provides intense red luminescence, characteristic of Eu3+ D-5(0)-> F-7(J) electronic transitions, with an intrinsic emission quantum yield of 38%, even in an aqueous suspension. Therefore, the correlation of luminescence, structure, particle morphology and fluorescence microscopy images make the hybrid promising for application in bioimaging. (AU) | |
| Processo FAPESP: | 19/26103-7 - Partículas de sílica decoradas com complexos luminescentes para aplicação em sensoriamento e imageamento celular |
| Beneficiário: | Sergio Antonio Marques de Lima |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 14/04907-3 - Nanopartículas de sílica funcionalizadas com base de Schiff |
| Beneficiário: | João Antonio Oliveira Santos |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |