Hauptseite > Publikationsdatenbank > Mapping the electrostatic potential of Au nanoparticles using hybrid electron holography > print

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|a Ozsoy - Keskinbora, C.
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245 _ _ |a Mapping the electrostatic potential of Au nanoparticles using hybrid electron holography
260 _ _ |a Amsterdam
|b Elsevier Science
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520 _ _ |a Electron holography is a powerful technique for characterizing electrostatic potentials, charge distributions, electric and magnetic fields, strain distributions and semiconductor dopant distributions with sub-nm spatial resolution. Mapping internal electrostatic and magnetic fields within nanoparticles and other low-dimensional materials by TEM requires both high spatial resolution and high phase sensitivity. Carrying out such an analysis fully quantitatively is even more challenging, since artefacts such as dynamical electron scattering may strongly affect the measurement. In-line electron holography, one of the variants of electron holography, features high phase sensitivity at high spatial frequencies, but suffers from inefficient phase recovery at low spatial frequencies. Off-axis electron holography, in contrast, can recover low spatial frequency phase information much more reliably, but is less effective in retrieving phase information at high spatial frequencies when compared to in-line holography. We investigate gold nanoparticles using hybrid electron holography at both atomic-resolution and intermediate magnification. Hybrid electron holography is a novel technique that synergistically combines off-axis and in-line electron holography, allowing the measurement of the complex wave function describing the scattered electrons with excellent signal-to-noise properties at both high and low spatial frequencies. The effect of dynamical electron scattering is minimized by beam tilt averaging.
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|a Boothroyd, Christopher Brian
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|a Dunin-Borkowski, Rafal
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|a van Aken, P. A.
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|a Koch, C. T.
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