| Texto completo | |
| Autor(es): |
Homann, Christian
;
Peeters, Regis
;
Mirmajidi, Hana
;
Berg, Jessica
;
Fay, Michael
;
Rodrigues, Lucas Carvalho Veloso
;
Radicchi, Eros
;
Jain, Akhil
;
Speghini, Adolfo
;
Hemmer, Eva
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF MATERIALS CHEMISTRY C; v. N/A, p. 16-pg., 2025-08-05. |
| Resumo | |
Gadolinium oxysulfide (Gd2O2S) is an attractive material of demonstrated suitability for a variety of imaging applications, leveraging its magnetic, scintillating, and luminescent properties, particularly when doped with optically active lanthanide ions (Ln3+). For many of these applications, control over size and morphology at the nanoscale is crucial. This study demonstrates the rapid microwave-assisted synthesis of colloidal Ln2O2S (Ln = Gd and dopants Yb, Er, Tb) nanostructures in as little as 20 min. Structural characterization using X-ray diffraction analysis (XRD), Raman spectroscopy, as well as transmission electron microscopy (TEM), including elemental mapping via energy dispersive X-ray spectroscopy (EDS), unveiled the key role of elemental sulphur (S8) in the reaction mixtures for materials growth. By systematically varying the Ln-to-S ratio from 1 : 0.5 to 1 : 15, controlled morphologies ranging from triangular nanoplatelets to berry- and flower-like shapes were achieved. Doping with Er3+/Yb3+ endowed the nano-triangles with upconverting and near-infrared emitting properties. Tb3+-doped Gd2O2S exhibited the characteristic green Tb3+ emission under UV excitation, while also showing X-ray excited optical luminescence (XEOL), rendering the material interesting as a potential nano-scintillator. (AU) | |
| Processo FAPESP: | 22/11983-4 - Espectroscopias com intensificação de sinal: nanomateriais, teoria e simulação computacional |
| Beneficiário: | Mauro Carlos Costa Ribeiro |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 24/03006-4 - Luminescência Estimulada de Minerais Simuladores Marcianos e Lunares |
| Beneficiário: | Neilo Marcos Trindade |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 19/05915-3 - Caracterização de Minerais para Dosimetria Luminescente das Radiações Ionizantes |
| Beneficiário: | Neilo Marcos Trindade |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 21/08111-2 - Materiais conversores de luz à base de terras raras: marcadores luminescentes, sensores e amplificadores ópticos |
| Beneficiário: | Hermi Felinto de Brito |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 23/18315-0 - Síntese e caracterização de Al2O3:C,Mg para aplicação em dosimetria luminescente. |
| Beneficiário: | Matheus Cavalcanti dos Santos Nunes |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |