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• W4200502407 startingPage "105915" @default.
• W4200502407 abstract "The size and composition of nanoparticles are instrumental to many catalytic processes; for example, their controlled synthesis is key to achieving high yield and quality in aerosol chemical vapor deposition (CVD) of carbon nanotubes (CNTs). Using a custom-built atmospheric pressure DC microplasma reactor, we synthesize sub-3 nm iron nanoparticle aerosols at high number concentration ( > 1 0 9 #/cm 3 ) with narrow size distribution ( σ g < 1 . 3 ) from a ferrocene vapor precursor. We demonstrate precise diameter control down to 1.1 nm and maximum yield near unity. We invoke a charge-mediated formation mechanism to show that the ∼ 10 μ s plasma residence time is sufficient to dissociate the precursor and partially ionize the resulting iron vapor, yet too short for the aggregation of clusters beyond 10 atoms. Thus, particle growth occurs primarily downstream of the plasma domain through aggregation of neutral and ionized vapor and clusters. This model closely reproduces the observed particle size distributions with the selection of an appropriate fractional ionization, yet is insufficient to entirely explain the rapid growth rate observed experimentally. This mechanism is different from that of existing microplasma processes, which have a longer residence time allowing particle formation to occur within the plasma, and may explain the demonstrated capability to co-optimize nanoparticle yield, throughput, and diameter control at a level exceeding the performance of previously published thermal and microplasma methods. • Designed and fabricated atmospheric pressure microplasma reactor for synthesis of nanoparticles. • Synthesized Fe aerosol with 1.1–3.0 nm diameter at high number concentration and yield. • Tuned particle size and diameter via precursor concentration and carrier gas flow rates. • Charge-mediated mechanism explains rapid particle formation and narrow size distribution." @default.
• W4200502407 created "2021-12-31" @default.
• W4200502407 creator A5024470411 @default.
• W4200502407 creator A5053697296 @default.
• W4200502407 date "2022-03-01" @default.
• W4200502407 modified "2023-10-13" @default.
• W4200502407 title "High-yield microplasma synthesis of monodisperse sub-3 nm diameter metal nanoparticles explained by a charge-mediated formation mechanism" @default.
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• W4200502407 doi "https://doi.org/10.1016/j.jaerosci.2021.105915" @default.
• W4200502407 hasPublicationYear "2022" @default.
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