Gas-phase Coating of Metal Particles via Control of Gas–Liquid–Solid Interfaces

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Key Points

This research proposes a simple gas-phase synthesis method for core-shell particles via aerosol processes, focusing on interface control.
Developed a one-step aerosol process for synthesizing core-shell structures with metal particle cores.
Controlled precursor concentration and hydrogen gas flow rate to adjust particle morphology, size, and crystal structure.
Optimized the balance of formation and reduction behaviors of Fe, FeO, and SiO2 phases during the synthesis.
Core size increases with higher precursor concentration while SiO2 shell tends to be thinner, aligning well with theoretical predictions.
Sufficient hydrogen supply is essential for achieving complete reduction to metal and suppressing impurity oxide formation, as revealed by powder X-ray diffraction.
The synthesized core-shell particles exhibit uniform spherical shapes and distinct core-shell structures, confirming the effectiveness of interface control.

Demonstrates the formation of stable core-shell structures in metal particles, indicating effective interface control during gas-phase synthesis.

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Ratnasari et al. (2026) studied this question.

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