Banca de QUALIFICAÇÃO: JARLEY FAGNER SILVA DO NASCIMENTO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : JARLEY FAGNER SILVA DO NASCIMENTO
DATA : 12/12/2016
HORA: 15:00
LOCAL: a definir
TÍTULO:

SYNTHESIS AND PHOTOPHYSICAL PROPERTIES OF MIXED LOFs

PALAVRAS-CHAVES:

LOFs; lanthanides; antenna effect; photoluminescence; morphology

PÁGINAS: 81
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Compostos Organo-Metálicos
RESUMO:

In this work was synthesized a new metal-organic frameworks containing lanthanide ions (LOFs) by solvothermal method at 120⁰C, using as the organic component terephthalic acid (1,4-H₂BDC). Three matrices containing gadolinium doped with 5 mol% Eu³⁺ ions were prepared (Eu/Gd-1,4-BDC-MOFs). The study focused on varying the synthesis time (3, 5 and 7 days) to understand the influence of this parameter on the morphological and luminescent properties of the net. The samples in powder form, were characterized by X-ray Diffraction (XRD), Attenuated total reflectance Fourier transform infrared spectroscopy (FTIR-ATR), Scanning Electronic Microscopy (SEM), Thermogravimetric Analysis (TGA) and Photoluminescence (PL). The results suggest that increased synthesis time has a significant influence on the morphology of the crystals. It was observed from the excitation and emission spectra intramolecular energy transfer between the ligand and the levels of Eu³⁺, which is not expected to MOFs type Eu-1,4-BDC. It was inferred from that that the high paramagnetic ion Gd³⁺ present in the matrix, it was essential to increase the antenna effect, giving a strong red emission from the sample.

MEMBROS DA BANCA:
Externo à Instituição - JOANNA ELZBIETA KULESZA - UFPE
Externo ao Programa - 338292 - JOÃO BOSCO LUCENA DE OLIVEIRA
Interno - 1958858 - LUIZ HENRIQUE DA SILVA GASPAROTTO