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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Chemistry

Background:

  • Engineering emissive defects in boron-based materials is crucial for advanced optics and sensing.
  • Developing fluorescent or phosphorescent compounds requires precise control over material properties.

Purpose of the Study:

  • To report a bottom-up synthesis of pure boron oxide nanoparticles from crystalline boron.
  • To investigate the formation of emissive defects and their influence on nanoparticle fluorescence.
  • To establish a green and scalable method for producing defect-engineered boron oxide nanoparticles.

Main Methods:

  • A two-step synthesis involving ultrasonication of boron powder in water followed by thermal annealing in air.
  • Characterization of nanoparticle composition and defect structures.
  • Analysis of fluorescence properties modulated by annealing temperature and defect concentration.

Main Results:

  • Successfully synthesized pure boron oxide nanoparticles without organic solvents or contaminants.
  • Identified nonstoichiometric oxo-hydroxy BOH compounds formed during ultrasonication.
  • Demonstrated that annealing temperature controls defect formation, primarily nonbridging oxygen in trigonal BO3 units, which enhances fluorescence.
  • Established a correlation between defect density and nanoparticle luminescence.

Conclusions:

  • The developed method provides a controlled and environmentally friendly route to synthesize fluorescent boron oxide nanoparticles.
  • Defect engineering, specifically the creation of nonbridging oxygen defects, is a viable strategy to tune the optical properties of boron oxide nanoparticles.
  • These nanoparticles hold potential for applications in optics and sensing due to their tunable fluorescence.