4.4 Article

ZnSe nanoparticles growth by aqueous colloidal solution at room temperature

Journal

JOURNAL OF CRYSTAL GROWTH
Volume 577, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jcrysgro.2021.126407

Keywords

A1; Crystal structure; A1; Solubility; A2; Growth from solutions; B1; Nanomaterials; B1; Zinc compounds; B2; Semiconducting II-IV materials

Funding

  1. VIEP-BUAP, Mexico [100319688-VIEP2018]
  2. PRODEP postdoctoral scholarship office [DSA/103.5/16/11331]

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ZnSe nanoparticles were synthesized in aqueous colloidal solution at different pH levels and temperature. Physicochemical analysis was conducted to study the formation and growth process of ZnSe-NPs. Characterization of the ZnSe-NPs was performed using XRD, Raman spectroscopy, SEM, and EDS techniques, revealing mixed cubic and hexagonal structures with nanoscale crystal sizes.
ZnSe nanoparticles (ZnSe-NPs) were obtained by aqueous colloidal solution at room temperature (25 degrees C) at different pH. A physicochemical study of the aqueous solution was proposed. The chemical reagents of the colloidal solution were zinc chloride, selenium elementary powder, Extran (R) as a surfactant, and sodium borohydride as a reducing agent. The species distribution diagrams (SDDs) and solubility curves (SCs) as pH functions were plotted as a result of the physicochemical analysis. The SDDs and SCs predicted the ZnSe-NPs formation and their growing process, therefore, a series of experiments according to these diagrams were performed at various pH of the colloidal solution through different Extran (R) content. The ZnSe-NPs were obtained without further purification. The ZnSe-NPs were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) techniques. The XRD results revealed that the ZnSe-NPs have mixed cubic and hexagonal crystalline structures, with crystal size at the nanoscale. The Raman spectra exhibited two peaks at 253 cm-1 of the longitudinal optical (LO) phonon mode, and 235 cm-1 of the surface phonon mode corresponding to the ZnSe bulk. The SEM images showed a variety of morphologies with different Zn/Se atomic ratios estimated from the EDS analysis.

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