Electron emission cross section of gold nanoparticles (AuNPs) are important for assessing their radiosensitizing effects from ionizing radiation using Monte-Carlo simulations. Measurements of these data require samples of sufficiently large area density, homogenous nanoparticle distribution and a mechanically stable sample holder to ensure a low background signal. While several methods exist for the deposition of nanoparticles, there is little information regarding the deposition of AuNPs in an aqueous solution onto a self-supporting film. The aim of this work is to find suitable preparation techniques for AuNP samples which fulfill the above requirements. AuNP samples are produced using different deposition techniques and a 50 nm-thick carbon foil as the substrate. These samples are characterized with respect to the size and spatial distribution of AuNPs using a scanning electron microscope. The drop-casting technique yielded the best results, while those obtained with the spin-coater technique are less reproducible regarding sample stability. The microdrop method is deemed unsuitable due to its tendency to form AuNP clusters. Measurements conducted with a synchrotron radiation source, as well as with protons and electrons, confirmed the suitability of these samples for studying electron emission spectra of AuNPs for different radiation types.
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CC BY 4.0 ; Creative Commons Attribution 4.0 License
Themenbereich der Metrologie
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Zitierung
Hepperle, P. A., Baek, W. Y., Nettelbeck, H., & Rabus, H. (2022). Deposition of gold nanoparticles on a self-supporting carbon foil. Particle and Particle Systems Characterization, 39(11), 1–11. https://doi.org/10.1002/ppsc.202200136
