Autor(es)

Teixeira, Alexandre Candido ; Netzlaff Fachini, Natan Felipe ; Kakinami, Henrique Kenzo Carvalho ; Mustafa, Danilo

• Tipo de documento: Artigo Científico
• Fonte: ACS OMEGA; v. 10, n. 38, p. 10-pg., 2025-09-17.

Resumo

The use of layered double hydroxides (LDHs) as luminescent hybrid materials has gained attention due to their structural versatility and ability to incorporate functional anions. In this study, we report the synthesis of a ZnAlEu-LDH intercalated with dibenzoylmethane (DBM) via the memory effect as an alternative strategy to obtain luminescent materials. The LDH precursor was synthesized by coprecipitation and then calcined at 460 degrees C to form a mixed oxide, followed by structural reconstruction in an aqueous DBM solution. The structural transformation and intercalation processes were confirmed by powder X-ray diffraction, Fourier-transform infrared spectroscopy, and elemental analysis (CHN and inductively coupled plasma optical emission spectrometry). Morphological changes were evaluated by scanning electron microscopy. Photoluminescence spectroscopy revealed that the DBM-intercalated LDHs exhibited a significant enhancement in the Eu3+ emission intensity due to the antenna effect from DBM, as demonstrated by the appearance of a broad S0(pi) -> S n (pi*) excitation band around 390 nm. The emission spectra also showed characteristic Eu3+ transitions with spectral shifts indicative of changes in the local ligand field upon DBM coordination. This work demonstrates that the memory effect is an effective strategy for incorporating photofunctional ligands into LDH matrices, opening new possibilities for the design of luminescent hybrid materials with tailored properties. (AU)

• Processo FAPESP: 15/19210-0 - Hidróxidos duplos lamelares (LDH) nanoestruturados com propriedades de up e down-conversion para aplicações como sensibilizadores em células solares
• Beneficiário: Danilo Mustafa
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 22/01314-8 - Estudo de hidróxidos duplos lamelares (HDL) como potencial fotocatalisador bifuncional
• Beneficiário: Danilo Mustafa
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 25/00720-0 - Espectrocopia de terras raras como ferramenta para monitorar a troca iônica de espécies incorporados entre as camadas de Hidróxidos Duplos Lamelares híbridos
• Beneficiário: Danilo Mustafa
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 24/17433-1 - Estudo in situ de espalhamento de raios X de baixos ângulos (SAXS) em hidróxido duplo lamelares (HDLs) nanoestruturados
• Beneficiário: Natan Felipe Netzlaff Fachini
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica