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  • Title: Three-dimensional chemical imaging of embedded nanoparticles using atom probe tomography.
    Author: Kuchibhatla SV, Shutthanandan V, Prosa TJ, Adusumilli P, Arey B, Buxbaum A, Wang YC, Tessner T, Ulfig R, Wang CM, Thevuthasan S.
    Journal: Nanotechnology; 2012 Jun 01; 23(21):215704. PubMed ID: 22551877.
    Abstract:
    Analysis of nanoparticles is often challenging especially when they are embedded in a matrix. Hence, we have used laser-assisted atom probe tomography (APT) to analyze the Au nanoclusters synthesized in situ using ion-beam implantation in a single crystal MgO matrix. APT analysis along with scanning transmission electron microscopy and energy dispersive spectroscopy (STEM-EDX) indicated that the nanoparticles have an average size ~8-12 nm. While it is difficult to analyze the composition of individual nanoparticles using STEM, APT analysis can give three-dimensional compositions of the same. It was shown that the maximum Au concentration in the nanoparticles increases with increasing particle size, with a maximum Au concentration of up to 50%.
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