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Zinc Oxide Nanoparticles-Solution-Based Synthesis and Characterizations.

Khagendra P Bhandari1, Dhurba R Sapkota2, Manoj K Jamarkattel2

  • 1Department of Physics and Astronomy, Ohio Northern University, Ada, OH 45810, USA.

Nanomaterials (Basel, Switzerland)
|June 10, 2023
PubMed
Summary
This summary is machine-generated.

This study presents a simple method for synthesizing zinc oxide (ZnO) nanoparticles, crucial for solar cell applications. Annealing the synthesized ZnO nanoparticles slightly reduces their optical band gap energy.

Keywords:
absorbanceabsorption coefficientbandgapcrystal structureellipsometrynanoparticlesurface morphologyznc oxide

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Zinc oxide (ZnO) nanoparticles offer versatile applications, particularly in solar cells.
  • Efficient synthesis methods are key to unlocking ZnO's potential.
  • Understanding ZnO's optical and structural properties is vital for device optimization.

Purpose of the Study:

  • To develop a facile, cost-effective synthesis for ZnO nanoparticles.
  • To characterize the optical and structural properties of synthesized ZnO nanoparticles.
  • To investigate the effect of annealing on ZnO nanoparticle properties.

Main Methods:

  • Controlled synthesis of ZnO nanoparticles using a simple method.
  • Optical band gap calculation via transmittance spectra and film thickness.
  • Spectroscopic ellipsometry (SE) for dielectric function analysis.
  • X-ray diffraction (XRD) and scanning electron microscopy (SEM) for structural characterization.

Main Results:

  • A simple, cost-effective synthesis method for ZnO nanoparticles was established.
  • As-synthesized ZnO nanoparticles exhibited an optical band gap of 3.40 eV.
  • Annealed ZnO films showed a reduced band gap of 3.30 eV, indicating a direct bandgap semiconductor.
  • SE analysis revealed lower photon energy absorption post-annealing.
  • XRD and SEM confirmed pure, crystalline ZnO with an average crystallite size of ~9 nm.

Conclusions:

  • The developed synthesis method is effective for producing pure, crystalline ZnO nanoparticles.
  • Annealing influences the optical properties of ZnO nanoparticles, reducing the band gap.
  • These findings contribute to the understanding and application of ZnO nanoparticles in fields like solar cells.