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	Three-dimensional electron ptychography of organic–inorganic hybrid nanostructures Zhiyuan Ding , Si Gao , Weina Fang , Chen Huang , Liqi Zhou , Xudong Pei , Xiaoguo Liu , Xiaoqing Pan , Chunhai Fan , Angus I. Kirkland , Peng Wang Nature Communications 13 DOI: 10.1038/s41467-022-32548-x Open Access Show Abstract ▼ Abstract: Three dimensional scaffolded DNA origami with inorganic nanoparticles has been used to create tailored multidimensional nanostructures. However, the image contrast of DNA is poorer than those of the heavy nanoparticles in conventional transmission electron microscopy at high defocus so that the biological and non-biological components in 3D scaffolds cannot be simultaneously resolved using tomography of samples in a native state. We demonstrate the use of electron ptychography to recover high contrast phase information from all components in a DNA origami scaffold without staining. We further quantitatively evaluate the enhancement of contrast in comparison with conventional transmission electron microscopy. In addition, We show that for ptychography post-reconstruction focusing simplifies the workflow and reduces electron dose and beam damage.	Aug 2022

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