1. Structure determination of Pt-coated Au dumbbells via fluctuation X-ray scattering.
- Author
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Chen, Gang, Modestino, Miguel A., Poon, Billy K., Schirotzek, André, Marchesini, Stefano, Segalman, Rachel A., Hexemer, Alexander, and Zwart, Peter H.
- Subjects
FLUCTUATIONS (Physics) ,X-ray scattering ,NANOPARTICLES ,SYMMETRY (Physics) ,ELECTRON distribution - Abstract
A fluctuation X-ray scattering experiment has been carried out on platinum-coated gold nanoparticles randomly oriented on a substrate. A complete algorithm for determining the electron density of an individual particle from diffraction patterns of many particles randomly oriented about a single axis is demonstrated. This algorithm operates on angular correlations among the measured intensity distributions and recovers the angular correlation functions of a single particle from measured diffraction patterns. Taking advantage of the cylindrical symmetry of the nanoparticles, a cylindrical slice model is proposed to reconstruct the structure of the nanoparticles by fitting the experimental ring angular auto-correlation and small-angle scattering data obtained from many scattering patterns. The physical meaning of the refined structure is discussed in terms of their statistical distributions of the shape and electron density profile. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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