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Martin Magnusson

Ställföreträdande prefekt & studierektor för grundutbildning

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In situ observation of synthesized nanoparticles in ultra-dilute aerosols via X-ray scattering

Författare

  • Sarah R. McKibbin
  • Sofie Yngman
  • Olivier Balmes
  • Bengt O. Meuller
  • Simon Tågerud
  • Maria E. Messing
  • Giuseppe Portale
  • Michael Sztucki
  • Knut Deppert
  • Lars Samuelson
  • Martin H. Magnusson
  • Edvin Lundgren
  • Anders Mikkelsen
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Summary, in English

In-air epitaxy of nanostructures (Aerotaxy) has recently emerged as a viable route for fast, large-scale production. In this study, we use small-angle X-ray scattering to perform direct in-flight characterizations of the first step of this process, i.e., the engineered formation of Au and Pt aerosol nanoparticles by spark generation in a flow of N2 gas. This represents a particular challenge for characterization because the particle density can be extremely low in controlled production. The particles produced are examined during production at operational pressures close to atmospheric conditions and exhibit a lognormal size distribution ranging from 5–100 nm. The Au and Pt particle production and detection are compared. We observe and characterize the nanoparticles at different stages of synthesis and extract the corresponding dominant physical properties, including the average particle diameter and sphericity, as influenced by particle sintering and the presence of aggregates. We observe highly sorted and sintered spherical Au nanoparticles at ultra-dilute concentrations (< 5 × 105 particles/cm3) corresponding to a volume fraction below 3 × 10–10, which is orders of magnitude below that of previously measured aerosols. We independently confirm an average particle radius of 25 nm via Guinier and Kratky plot analysis. Our study indicates that with high-intensity synchrotron beams and careful consideration of background removal, size and shape information can be obtained for extremely low particle concentrations with industrially relevant narrow size distributions. [Figure not available: see fulltext.].

Avdelning/ar

  • Synkrotronljusfysik
  • NanoLund: Centre for Nanoscience
  • MAX IV-laboratoriet
  • Fasta tillståndets fysik

Publiceringsår

2019-01

Språk

Engelska

Sidor

25-31

Publikation/Tidskrift/Serie

Nano Research

Volym

12

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

  • Condensed Matter Physics
  • Nano Technology

Nyckelord

  • aerosol
  • Aerotaxy
  • in situ analysis
  • nanoparticle synthesis
  • small-angle X-ray scattering

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1998-0124