Propiedades físicas de nanopartículas de óxido de manganeso sintetizadas usando extractos de hojas de guanábana, matico, laurel rosa, achiote y nimbo a diferentes concentraciones
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Date
2024
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Universidad Nacional de Trujillo
Abstract
Se llevó a cabo la síntesis y caracterización de nanopartículas de óxido de manganeso utilizando extractos de hojas frescas laurel rosa (ELR), matico (EM), guanábana (EG), nimbo o neem (EN), achiote (EA). Se emplearon cuatro concentraciones distintas de extracto para cada planta, con el objetivo de evaluar el efecto de las concentraciones sobre las propiedades físicas y ópticas de las nanopartículas. Los resultados de difracción de rayos X (DRX) se evidencio la formación de Mn3O4, donde el efecto de la concentración de EA y EN fue notorio en la cristalinidad de las nanopartículas. Con los datos de espectroscopia UV-vis-NIR (reflectancia) y mediante la recta de Tauc se obtuvo la banda prohibida, para las nanopartículas obtenidas con EM y EN la banda gap disminuye al aumentar la concentración de extracto. Los resultados de espectroscopia Raman confirman la formación de las nanopartículas Mn3O4 con todo el extracto, además hay un corrimiento a la izquierda del modo A1g respecto al material granel. Los resultados espectroscopia de fotoluminiscencia (FL) muestran seis bandas de emisión, donde indica que el material tiene vacancias de oxígeno y defectos. Los resultados de espectroscopía infrarroja por transformada de Fourier (FTIR) se corroboro la formación de Mn3O4, además se obtuvo otras bandas que se atribuyen a vibraciones de grupos funcionales presentes en los extractos. Mediate microscopía electrónica de transmisión (TEM) y dispersión de luz dinámica (DLS) se confirmó que le material tiende a aglomerarse
Abstract The synthesis and characterization of manganese oxide nanoparticles was carried out using extracts of fresh rose laurel (ELR), matico (EM), soursop (EG), nimbus or neem (EN), annatto (EA) leaves. Four different concentrations of extract were used for each plant, with the aim of evaluating the effect of the concentrations on the physical and optical properties of the nanoparticles. The X-ray diffraction (XRD) results showed the formation of Mn3O4, where the effect of the concentration of EA and EN was noticeable on the crystallinity of the nanoparticles. With the UV-vis-NIR spectroscopy data (reflectance) and the Tauc line, the band gap was obtained. For the nanoparticles obtained with EM and EN, the band gap decreases with increasing extract concentration. The Raman spectroscopy results confirm the formation of Mn3O4 nanoparticles with the entire extract, and there is also a shift to the left of the A1g mode with respect to the bulk material. The photoluminescence (FL) spectroscopy results show six emission bands, indicating that the material has oxygen vacancies and defects. The results of Fourier transform infrared spectroscopy (FTIR) confirmed the formation of Mn3O4, and other bands were obtained that are attributed to vibrations of functional groups present in the extracts. Through transmission electron microscopy (TEM) and dynamic light scattering (DLS) it was confirmed that the material tends to agglomerate
Abstract The synthesis and characterization of manganese oxide nanoparticles was carried out using extracts of fresh rose laurel (ELR), matico (EM), soursop (EG), nimbus or neem (EN), annatto (EA) leaves. Four different concentrations of extract were used for each plant, with the aim of evaluating the effect of the concentrations on the physical and optical properties of the nanoparticles. The X-ray diffraction (XRD) results showed the formation of Mn3O4, where the effect of the concentration of EA and EN was noticeable on the crystallinity of the nanoparticles. With the UV-vis-NIR spectroscopy data (reflectance) and the Tauc line, the band gap was obtained. For the nanoparticles obtained with EM and EN, the band gap decreases with increasing extract concentration. The Raman spectroscopy results confirm the formation of Mn3O4 nanoparticles with the entire extract, and there is also a shift to the left of the A1g mode with respect to the bulk material. The photoluminescence (FL) spectroscopy results show six emission bands, indicating that the material has oxygen vacancies and defects. The results of Fourier transform infrared spectroscopy (FTIR) confirmed the formation of Mn3O4, and other bands were obtained that are attributed to vibrations of functional groups present in the extracts. Through transmission electron microscopy (TEM) and dynamic light scattering (DLS) it was confirmed that the material tends to agglomerate
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Keywords
Nanopartículas, Mn3O4, extractos vegetales, reflectancia, fotoluminiscencia, Raman, estructura cristalina