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Nano Research

, Volume 12, Issue 1, pp 25–31 | Cite as

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

  • Sarah R. McKibbinEmail author
  • 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 MikkelsenEmail author
Open Access
Research Article

Abstract

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.

Keywords

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

Notes

Acknowledgements

This work was performed within Nanolund at Lund University, and was supported by the Knut and Alice Wallenberg Foundation, the Swedish Research Council (VR) and the Swedish Foundation for Strategic Research (SSF). The Dutch Organization for Scientific Research (NWO) and the ESRF are acknowledged for providing beamtime for this project.

Supplementary material

12274_2018_2170_MOESM1_ESM.pdf (1.7 mb)
In situ observation of synthesized nanoparticles in ultra-dilute aerosols via X-ray scattering

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Copyright information

© The Author(s) 2018

Open Access The article published in this journal is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

, corrected publication 2018

Authors and Affiliations

  • Sarah R. McKibbin
    • 1
    Email author
  • Sofie Yngman
    • 1
  • Olivier Balmes
    • 2
  • Bengt O. Meuller
    • 1
  • Simon Tågerud
    • 1
  • Maria E. Messing
    • 1
  • Giuseppe Portale
    • 3
  • Michael Sztucki
    • 4
  • Knut Deppert
    • 1
  • Lars Samuelson
    • 1
  • Martin H. Magnusson
    • 1
  • Edvin Lundgren
    • 1
  • Anders Mikkelsen
    • 1
    Email author
  1. 1.Department of Physics and NanolundLund UniversityLundSweden
  2. 2.MaxIV LaboratoryLund UniversityLundSweden
  3. 3.University of Groningen, Zernike Institute for Advanced MaterialsGroningenThe Netherlands
  4. 4.ESRF – The European SynchrotronGrenoble Cedex 9France

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