Lyes LAMIRI - Academia.edu (original) (raw)

Lyes LAMIRI

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Judith L Green

E. Wayne Ross

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Professor Dr. Loutfy H . Madkour

Arunkumar Paulraj

Guilherme Moerbeck

Guilherme Moerbeck

UERJ - Universidade do Estado do Rio de Janeiro / Rio de Janeiro State University

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Papers by Lyes LAMIRI

Research paper thumbnail of Density Functional Theory Study of Gold Doped Armchair Graphene Nanoribbons with Vacancies

Journal of Computational and Theoretical Nanoscience, 2018

Research paper thumbnail of Structural, morphological and steady state photoluminescence spectroscopy studies of red Eu(3+) -doped Y2 O3 nanophosphors prepared by the sol-gel method

Luminescence : the journal of biological and chemical luminescence, Jan 31, 2015

Europium trivalent (Eu(3+) )-doped Y2 O3 nanopowders of different concentrations (0.5, 2.5, 5 or ... more Europium trivalent (Eu(3+) )-doped Y2 O3 nanopowders of different concentrations (0.5, 2.5, 5 or 7 at.%) were synthesized by the sol-gel method, at different pH values (pH 2, 5 or 8) and annealing temperatures (600°C, 800°C or 1000°C). The nanopowders samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR) and steady state photoluminescence spectroscopy. The effect of pH of solution and annealing temperatures on structural, morphological and photoluminescence properties of Eu(3+) -doped Y2 O3 were studied and are discussed. It was found that the average crystallite size of the nanopowders increased with increasing pH and annealing temperature values. The Y2 O3 :Eu(3+) material presented different morphology and its evolution depended on the pH value and the annealing temperature. Activation energies at different pH values were determined and are discussed. Under ultraviolet (UV) ligh...

Research paper thumbnail of Density Functional Theory Study of Gold Doped Armchair Graphene Nanoribbons with Vacancies

Journal of Computational and Theoretical Nanoscience, 2018

Research paper thumbnail of Structural, morphological and steady state photoluminescence spectroscopy studies of red Eu(3+) -doped Y2 O3 nanophosphors prepared by the sol-gel method

Luminescence : the journal of biological and chemical luminescence, Jan 31, 2015

Europium trivalent (Eu(3+) )-doped Y2 O3 nanopowders of different concentrations (0.5, 2.5, 5 or ... more Europium trivalent (Eu(3+) )-doped Y2 O3 nanopowders of different concentrations (0.5, 2.5, 5 or 7 at.%) were synthesized by the sol-gel method, at different pH values (pH 2, 5 or 8) and annealing temperatures (600°C, 800°C or 1000°C). The nanopowders samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR) and steady state photoluminescence spectroscopy. The effect of pH of solution and annealing temperatures on structural, morphological and photoluminescence properties of Eu(3+) -doped Y2 O3 were studied and are discussed. It was found that the average crystallite size of the nanopowders increased with increasing pH and annealing temperature values. The Y2 O3 :Eu(3+) material presented different morphology and its evolution depended on the pH value and the annealing temperature. Activation energies at different pH values were determined and are discussed. Under ultraviolet (UV) ligh...

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