Synthesis and Characterization of CdSe Nanoparticles with Cadmium Precursor Variation in Colloidal Synthesis

Abstract:

A comparative study of the synthesis of cadmium selenide (CdSe) nanoparticles (NPs) using different cadmium precursors such as, cadmium nitrate (Cd (NO₃)₂·4H₂O), cadmium acetate ((CH₃COO)₂Cd·2H₂O) and cadmium chloride (CdCl₂·2.5H₂O) is presented in this work. The method used to obtain the CdSe NPs was the colloidal synthesis at low temperature and atmospheric pressure. The Cd²⁺ ions were obtained in aqueous solution at room temperature, the surfactant used in the process was an aqueous solution of sodium hydroxide (NaOH), penta-sodium tripolyphosphate and H₂O named commonly extran, which not only helps to stabilize the NPs, but also allows adjusting the pH of the solution. Se^2- ions were obtained with sodium borohydride (NaBH₄) as reductant at 75 oC. The by-products from the reaction were eliminated through a cleaning process with hydrochloric acid (HCl). Molar concentration of Cd:Se was varied from 3:1 to 1:3 and the pH value was varied between 8 and 11. The obtained samples were characterized by X-ray diffraction (XRD), it was seen that the obtained NPs present cubic centered face structure. The crystallite size from the powder was calculated using the Debye-Scherrer equation and was found between 3.3 nm and 5.6 nm, the variation in size depends on the molar concentration of cadmium and selenium. Morphological study was done using scanning electron microscopy (SEM) and compositional analysis was done by energy dispersive x-ray analysis (EDAX).

• Periodical: Advanced Materials Research (Volume 976)
• Pages: 52-58
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.976.52
• Online since: June 2014
• Authors: Janeth Sarmiento Arellano*, Enrique Rosendo, Román Romano, Gabriela Nieto, Tomás Díaz, Godofredo García, Héctor Juárez, Mauricio Pacio, R. Galeazzi, C. Morales, A. Ivan Oliva
• Keywords: CdSe, Colloidal Synthesis, Nanoparticle

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