Ionic liquid assisted sonochemical synthesis of NiS submicron particles |
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| Affiliation: | 1. Departamento de Física, Universidade Estadual de Ponta Grossa, Av. General Carlos Cavalcanti, 4748 - Ponta Grossa, PR 87030-900, Brazil;2. National Institute of Science and Technology for Complex Systems, Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150 - Rio de Janeiro, RJ 22290-180, Brazil;3. Departamento de Engenharia Química, Universidade Federal do Paraná, Av. Cel. Francisco H. dos Santos, 210 - Jardim das Americas - Curitiba, PR 81531 - 990, Brazil |
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| Abstract: | A novel synthesis methodology is reported for the preparation of NiS submicron particles in a green solvent 1-butyl-3methylimidazolium tetrafluoroborate (BMImBF4) ionic liquid (IL), using ultrasonic sonochemical technique. Structural, morphological and optical properties of nickel sulfide powders were obtained by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and diffuse reflectance spectroscopy (DRS). Composition was corroborated by energy dispersive X-ray spectroscopy (EDXS), both in the SEM and in the TEM. Regular shape particles were obtained under high-intensity ultrasonic irradiation for 105 min from the reaction between nickel nitrate and thioacetamide in ethanol/BMImBF4 (80:20), respectively. After vacuum annealing treatment at 180 °C overnight, spherical crystalline NiS particles were observed. The powders showed a band gap of 0.74 eV. |
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| Keywords: | Ionic liquid Sonochemistry NiS Semiconductor |
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