Fluidized bed coupled rotary reactor for nanoparticles coating via atomic layer deposition

Area of Science:

• Materials Science
• Chemical Engineering
• Nanotechnology

Background:

• Atomic layer deposition (ALD) is crucial for nanoscale coatings.
• Conventional ALD methods face challenges in uniform coating on nanoparticles.
• Efficient precursor delivery and utilization are key for ALD processes.

Purpose of the Study:

• To design and evaluate a novel fluidized bed coupled rotary reactor for nanoparticle coating via ALD.
• To enhance gas-solid interactions and precursor delivery for faster coating.
• To achieve high precursor utilization and uniform nanoscale film growth.

Main Methods:

• A fluidized bed coupled rotary reactor with a specialized particle cartridge was designed.
• Continuous particle fluidization and rotation were employed to homogenize the particle bed.
• In situ mass spectrometry, ICP-OES, HAADF-TEM, and EDS were used for characterization.

Main Results:

• The reactor design demonstrated stable fluidization and enhanced gas-solid contact.
• Optimized conditions reduced minimum pulse time for complete coating.
• Precursor utilization reached up to 90% with uniform Al2O3 nanoscale film growth on SiO2 NPs.

Conclusions:

• The fluidized bed coupled rotary reactor is effective for efficient and uniform atomic layer deposition on nanoparticles.
• The reactor design facilitates high precursor utilization and reduced processing times.
• This technology offers a promising approach for scalable nanoparticle coating applications.