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Growth of ZnO Nanoparticles Using Microwave Hydrothermal Method-Search for Defect-Free Particles.

Julita Rosowska1,2, Jarosław Kaszewski2, Marcin Krajewski3

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Selecting specific chemical reagents during microwave-assisted hydrothermal synthesis of zinc oxide (ZnO) nanoparticles significantly controls their optical properties. This method successfully produced ZnO nanoparticles with low defect-related luminescence, ideal for biomedical applications.

Keywords:
cathodoluminescence (CL)deep-level emission (DLE)defect-related luminescenceluminescent properties of ZnOmicrowave hydrothermal methodmicrowave-assisted synthesisnear-band-edge (NBE) emissionphotoluminescence (PL)zinc oxide (ZnO) nanoparticles

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Chemistry

Background:

  • Zinc oxide (ZnO) nanoparticles possess tunable optical properties crucial for various applications.
  • Controlling defect-related emissions is essential for optimizing ZnO nanoparticle performance.
  • The microwave-assisted hydrothermal method offers efficient synthesis of nanomaterials.

Purpose of the Study:

  • To investigate how chemical reagent selection impacts the optical properties of ZnO nanoparticles.
  • To control the intensities of near-band-edge (NBE) and defect-related deep-level emissions (DLE).
  • To achieve synthesis of ZnO nanoparticles with minimized defect-related luminescence.

Main Methods:

  • Synthesis of ZnO nanoparticles using the microwave-assisted hydrothermal method.
  • Utilized two zinc precursors: zinc nitrate and zinc chloride.
  • Employed three precipitating agents: sodium hydroxide (NaOH), potassium hydroxide (KOH), and ammonium hydroxide (NH₄OH).

Main Results:

  • ZnO nanoparticles synthesized using zinc chloride (ZnCl₂) exhibited a significantly higher NBE/DLE intensity ratio compared to those from zinc nitrate.
  • Chlorine ions (Cl⁻) were identified as key in passivating defects, forming V₀-Cl₂ complexes and reducing oxygen vacancy (V₀) related luminescence.
  • Post-synthesis thermal treatment in a nitrogen atmosphere enhanced defect-related luminescence, suggesting chlorine atom diffusion.

Conclusions:

  • Chemical reagent selection is critical for tailoring the optical properties and defect density of ZnO nanoparticles.
  • The microwave-assisted hydrothermal method, with appropriate reagent choice, can yield ZnO nanoparticles with low defect-related luminescence.
  • Optimized ZnO nanoparticles are promising for biomedical applications including bioimaging, antibacterial treatments, and photocatalysis.