Three dimensional accurate morphology measurements of polystyrene standard particles on silicon substrate by electron tomography

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DOIResolve DOI: http://doi.org/10.1016/j.micron.2015.08.003
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TypeArticle
Journal titleMicron
ISSN0968-4328
Volume79
Pages5358
Subjectelectron tomography; (scanning) transmission electron microscopy ((S)TEM); polystyrene latex spheres; calibration sample; metrology; accurate shape measurement; surface energy; nanoparticle deformation; quantitative electron tomography
AbstractPolystyrene latex (PSL) nanoparticle (NP) sample is one of the most widely used standard materials. It is used for calibration of particle counters and particle size measurement tools. It has been reported that the measured NP sizes by various methods, such as Differential Mobility Analysis, dynamic light scattering (DLS), optical microscopy (OM), scanning electron microscopy (SEM) and atomic force microscopy (AFM), differ from each other. Deformation of PSL NPs on mica substrate has been reported in AFM measurements: the lateral width of PSL NPs is smaller than their vertical height. To provide a reliable calibration standard, the deformation must be measured by a method that can reliably visualize the entire three dimensional (3D) shape of the PSL NPs. Here we present a method for detailed measurement of PSL NP 3D shape by means of electron tomography in a transmission electron microscope. The observed shape of the PSL NPs with 100 nm and 50 nm diameter were not spherical, but squished in direction perpendicular to the support substrate by about 7.4% and 12.1%, respectively. The high difference in surface energy of the PSL NPs and that of substrate together with their low Young modulus appear to explain the squishing of the NPs without presence of water film.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationNational Institute for Nanotechnology; National Research Council Canada
Peer reviewedYes
NPARC number23001698
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Record identifiercc54dc45-2a52-4463-b4ca-abe279bd86de
Record created2017-03-20
Record modified2017-03-20
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