Aerosol sample preparation methods for X-ray diffractive imaging: Size-selected spherical nanoparticles on silicon nitride foils

Michael J. Bogan, W. Henry Benner, Stefan P. Hau-Riege, Henry N. Chapman, Matthias Frank

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

We are developing aerosol generating and processing methods for X-ray analyses of nanoscale materials using conventional synchrotron radiation sources and using the newly operational soft X-ray free-electron laser in Hamburg (FLASH) at the Deutsches Elektronen Synchrotron. Charge-reduced electrospray, differential mobility analysis and an electrostatic precipitator were used to prepare samples consisting of size-monodisperse spherical nanoparticles deposited on 20 nm thick silicon nitride foils supported by silicon frames. Ninety-seven and 102 nm diameter spheres were selected from a broader distribution of 98 nm spheres using differential mobility. We measured the size distribution of the spheres using forward scattering from 1.65 nm light at the Advanced Light Source (ALS) in Lawrence Berkeley National Laboratory and scanning electron microscopy (SEM). The full-width half maximum (FWHM) of the size distribution of the size-selected spheres was as narrow as 5.4 nm when measured by SEM, as compared to 16 nm for the non-size-selected distribution. Forward scattering measurements of the 97 nm diameter size-selected spheres fit a size distribution with a FWHM of 4 nm and allowed us to validate the methodology for use in future diffraction imaging experiments at FLASH.

Original languageEnglish (US)
Pages (from-to)1119-1128
Number of pages10
JournalJournal of Aerosol Science
Volume38
Issue number11
DOIs
StatePublished - Nov 1 2007
Externally publishedYes

Keywords

  • Differential mobility
  • Electrospray
  • Nanoparticle
  • X-ray diffractive imaging

ASJC Scopus subject areas

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution

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