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Analysis of Electron Transparent Beam-Sensitive Samples Using Scanning Electron Microscopy Coupled With Energy-Dispersive X-ray Spectroscopy

Published online by Cambridge University Press:  01 June 2020

Anders Brostrøm
Affiliation:
Technical University of Denmark, DTU Nanolab – National Centre for Nano Fabrication and Characterization, Fysikvej, Building 307, Kgs Lyngby2800, Denmark National Research Centre for the Working Environment, Lersø Parkallé 105, Copenhagen2100, Denmark
Kirsten Inga Kling
Affiliation:
Technical University of Denmark, DTU Nanolab – National Centre for Nano Fabrication and Characterization, Fysikvej, Building 307, Kgs Lyngby2800, Denmark SAXOCON A/S, Bredevej 2D, Virum2830, Denmark
Karin Sørig Hougaard
Affiliation:
National Research Centre for the Working Environment, Lersø Parkallé 105, Copenhagen2100, Denmark
Kristian Mølhave*
Affiliation:
Technical University of Denmark, DTU Nanolab – National Centre for Nano Fabrication and Characterization, Fysikvej, Building 307, Kgs Lyngby2800, Denmark
*
*Authors for correspondence: Kristian Mølhave, E-mail: krmo@dtu.dk, Anders Brostrøm, E-mail: abbl@dtu.dk
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Abstract

Scanning electron microscopy, coupled with energy-dispersive X-ray spectroscopy (EDS), is a powerful tool used in many scientific fields. It can provide nanoscale images, allowing size and morphology measurements, as well as provide information on the spatial distribution of elements in a sample. This study compares the capabilities of a traditional EDS detector with a recently developed annular EDS detector when analyzing electron transparent and beam-sensitive NaCl particles on a TEM grid. The optimal settings for single particle analysis are identified in order to minimize beam damage and optimize sample throughput via the choice of acceleration voltage, EDS acquisition time, and quantification model. Here, a linear combination of two models is used to bridge results for particle sizes, which are neither bulk nor sufficiently thin to assume electron transparent. Additionally, we show that the increased count rate obtainable with the annular detector enables mapping as a viable analysis strategy compared with feature detection methods, which only scan segmented regions. Finally, we discuss advantages and disadvantages of the two analysis strategies.

Type
Materials Science Applications
Copyright
Copyright © Microscopy Society of America 2020

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