Your browser has javascript turned off or blocked. This will lead to some parts of our website to not work properly or at all. Turn on javascript for best performance.

The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Knut Deppert

Knut Deppert

Professor

Knut Deppert

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

Author

  • 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

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.].

Department/s

  • Synchrotron Radiation Research
  • NanoLund
  • MAX IV Laboratory
  • Solid State Physics

Publishing year

2019-01

Language

English

Pages

25-31

Publication/Series

Nano Research

Volume

12

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Condensed Matter Physics
  • Nano Technology

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1998-0124