Electron coherent diffraction tomography of a nanocrystal

Dronyak, Roman; Liang, Keng S.; Jin-Sheng Tsai; Stetsko, Yuri P.; Ting-Kuo Lee; Fu-Rong Chen
May 2010
Applied Physics Letters;5/31/2010, Vol. 96 Issue 22, p221907
Academic Journal
Coherent diffractive imaging (CDI) with electron or x-ray sources is a promising technique for investigating the structure of nanoparticles down to the atomic scale. In electron CDI, a two-dimensional reconstruction is demonstrated using highly coherent illumination from a field-emission gun as a source of electrons. In a three-dimensional (3D) electron CDI, we experimentally determine the morphology of a single MgO nanocrystal using the Bragg diffraction geometry. An iterative algorithm is applied to invert the 3D diffraction pattern about a (200) reflection of the nanoparticle measured at an angular range of 1.8°. The results reveal a 3D image of the sample at ∼8 nm resolution, and agree with a simulation. Our work demonstrates an alternative approach to obtain the 3D structure of nanocrystals with an electron microscope.


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