In:
Journal of Applied Crystallography, International Union of Crystallography (IUCr), Vol. 53, No. 3 ( 2020-06-01), p. 741-747
Abstract:
This work describes the application of X-ray ptychography for the inspection of complex assemblies of highly anisotropic nanocrystals embedded in a thick polymer matrix. More specifically, this case deals with CdSe/CdS octapods, with pod length L = 39 ± 2 nm and pod diameter D = 12 ± 2 nm, dispersed in free-standing thick films (24 ± 4 µm) of polymethyl methacrylate and polystyrene, with different molecular weights. Ptychography is the only imaging method available to date that can be used to study architectures made by these types of nanocrystals in thick polymeric films, as any other alternative direct method, such as scanning/transmission electron microscopy, can be definitively ruled out as a result of the large thickness of the free-standing films. The electron density maps of the investigated samples are reconstructed by combining iterative difference map algorithms and a maximum likelihood optimization algorithm. In addition, post image processing techniques are applied to both reduce noise and provide a better visualization of the material morphological details. Through this process, at a final resolution of 27 nm, the reconstructed maps allow us to visualize the intricate network of octapods inside the polymeric matrices.
Type of Medium:
Online Resource
ISSN:
1600-5767
DOI:
10.1107/S160057672000583X
Language:
Unknown
Publisher:
International Union of Crystallography (IUCr)
Publication Date:
2020
detail.hit.zdb_id:
2020879-0
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