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From Structure to Optics: The pH-Temperature Interplay in Aqueous Solution CdS Nanoparticles.

Elvia Angelica Sanchez-Ramirez1, Ramón Arellano-Piña1, M A Hernandez-Perez2

  • 1Departamento de Ingeniería Metalúrgica-UPIIZ, Instituto Politécnico Nacional, Zacatecas CP 98160, Mexico.

Nanomaterials (Basel, Switzerland)
|January 9, 2026
PubMed
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Synthesis conditions significantly impact cadmium sulfide (CdS) nanoparticle properties. Adjusting pH and temperature alters crystallite size, phase, and optical characteristics for tailored electronic applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Cadmium sulfide (CdS) nanoparticles are II-VI semiconductors vital for optoelectronic devices.
  • Their properties are tunable via synthesis parameters, influencing performance.

Purpose of the Study:

  • To investigate the influence of pH and temperature on CdS nanoparticle synthesis.
  • To correlate synthesis conditions with structural, optical, and morphological characteristics.

Main Methods:

  • Chemical precipitation method for CdS nanoparticle synthesis.
  • Systematic variation of pH (4.8-10.1) and temperature (50, 75, 90 °C).
  • Characterization using UV-VIS spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM).
Keywords:
CdS nanoparticlesaqueous mediumoptical propertiespH effectsemiconductor materialsstructural properties

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Main Results:

  • Synthesis variables critically determine crystallite size, cluster size, and optical properties.
  • pH influences CdS phase formation (cubic in alkaline, hexagonal in acidic conditions) more than temperature.
  • Elevated temperatures enhance nanoparticle quality by reducing secondary phase impurities.
  • Band gap (Eg) is significantly affected, ranging from 2.21 to 2.40 eV.
  • Acidic conditions yield uniform, rounded nanoparticles; alkaline conditions produce larger CdS crystals.

Conclusions:

  • Synthesis conditions, particularly pH and temperature, offer precise control over CdS nanoparticle characteristics.
  • Tailored CdS nanoparticles with specific semiconductor profiles can be developed for diverse electronic device applications.