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PREPARATION OF COBALT NANOSTRUCTURES USING PULSED Nd: YAG LASER
PREPARACIÓN DE NANOESTRUCTURAS DE COBALTO UTILIZANDO UN LÁSER Nd:YAG PULSADO
DOI:
https://doi.org/10.15446/mo.n72.118854Keywords:
cobalt nanoparticles, laser ablation, Cobalt nanoparticles, Laser ablation, physical properties of nanostructures (en)nanopartículas de cobalto, ablación láser, propiedades físicas de las nanoestructuras (es)
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This study presents the preparation and characterization of cobalt nanoscale particles, focusing on several of their physical properties. Cobalt nanostructures were synthesized using the Pulsed Laser Ablation in Liquid (PLAL) method, employing a Q-switched Nd: laser with a fundamental wavelength of 1064 nm, a pulse duration of 10 ns, and a repetition rate of 1 Hz. Laser ablation energies of 200 and 400 mJ, along with varying pulse counts of 100, 200, and 300 per energy setting, were used for synthesis. The measured physical properties include optical absorbance, absorption coefficient, energy gap, refractive index, and extinction coefficient. Three energy gap values, 1.53, 2.36, and 3.53 eV, were observed, showing a slight increase with the total number of pulses, with minimal influence from the pulse energy. Other optical parameters, including refractive index, absorption coefficient, extinction coefficient, and optical conductivity, exhibited an increasing trend with a higher total number of pulses.
Este estudio presenta la preparación y caracterización de nanopartículas de cobalto, centrándose en varias de sus propiedades físicas. Las nanoestructuras de cobalto se sintetizaron mediante la técnica de ablación láser pulsada en líquido (PLAL, por sus siglas en inglés), empleando un láser Nd:YAG conmutado en Q, con una longitud de onda fundamental de 1064 nm, una duración de pulso de 10 ns y una frecuencia de repetición de 1 Hz. Se emplearon energías de ablación láser de 200 y 400 mJ, junto con diferentes números de pulsos (100, 200 y 300) para cada valor de energía. Las propiedades físicas medidas incluyen la absorbancia óptica, el coeficiente de absorción, la banda prohibida, el índice de refracción y el coeficiente de extinción. Se observaron tres valores de energía de banda (1,53; 2,36 y 3,53 eV), los cuales mostraron un ligero incremento con el número total de pulsos y una influencia mínima de la energía de ablación. Otros parámetros ópticos, como el índice de refracción, el coeficiente de absorción, el coeficiente de extinción y la conductividad óptica, mostraron una tendencia creciente al aumentar el número total de pulsos.
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