β-Bi₂O₃ reduction by laser irradiation in a liquid environment

Area of Science:

• Materials Science
• Nanotechnology
• Physical Chemistry

Background:

• Bismuth oxide (β-Bi2O3) nanoparticles are versatile materials with potential applications.
• Developing efficient and environmentally friendly synthesis methods for nanomaterials is crucial.
• Controlling the phase and morphology of nanomaterials influences their properties and applications.

Purpose of the Study:

• To investigate the structural and stoichiometric modifications of β-Bi2O3 nanoparticles using UV pulsed laser irradiation.
• To explore the influence of different liquid environments (water and ethanol) on the outcome of the laser irradiation process.
• To characterize the resulting nanomaterials and assess their potential applications.

Main Methods:

• Synthesis of β-Bi2O3 nanospheres.
• UV pulsed laser irradiation in aqueous and ethanolic solutions.
• Characterization using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy, and high-resolution transmission electron microscopy (HRTEM).

Main Results:

• UV pulsed laser irradiation is a green, fast, and effective method for modifying β-Bi2O3 nanoparticles.
• Irradiation in water yields bismuth subcarbonate (Bi2O2CO3) nanosheets.
• Irradiation in ethanol produces metallic bismuth (Bi) nanoparticles, with the amount dependent on laser fluence.
• The liquid environment dictates the transformation pathway of β-Bi2O3 nanoparticles.

Conclusions:

• UV pulsed laser irradiation provides a controllable route to synthesize different bismuth-based nanomaterials.
• The synthesized bismuth subcarbonate nanosheets and metallic bismuth nanoparticles have potential applications in photocatalysis, light filters, and environmental sensors.
• This method offers a sustainable approach to nanomaterial fabrication.