X-ray ptychographic mode of self-assembled CdSe/CdS octapod-shaped nanocrystals in thick polymers

De, Liberato; Scattarella, Francesco; Altamura, Davide; Arciniegas, Milena P.; Siliqi, Dritan; Manna, Liberato; Giannini, Cinzia

doi:10.1107/s160057672000583x

Cited by 2 publications

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“…Perovskite materials can be driven to self-assembly into 1D, 2D or 3D superlattices which has given rise to focused research on targeted functionalization of low dimensional perovskites and perovskite NC superlattice structures. ,,,,,− Improved strategies to control shape and size have been found in recent years and targeted tuning is within reach. , As more methods for self-assembly and directed superlattice growth of NCs become available also the need for more detailed structural, superstructural and morphological characterization techniques arises. Long-range ordering of the NCs leads to a scattering signal.…”

Section: Morphological and Structural Characterizationmentioning

confidence: 99%

State of the Art and Prospects for Halide Perovskite Nanocrystals

et al. 2021

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Metal-halide perovskites have rapidly emerged as one of the most promising materials of the 21st century, with many exciting properties and great potential for a broad range of applications, from photovoltaics to optoelectronics and photocatalysis. The ease with which metal-halide perovskites can be synthesized in the form of brightly luminescent colloidal nanocrystals, as well as their tunable and intriguing optical and electronic properties, has attracted researchers from different disciplines of science and technology. In the last few years, there has been a significant progress in the shape-controlled synthesis of perovskite nanocrystals and understanding of their properties and applications. In this comprehensive review, researchers having expertise in different fields (chemistry, physics, and device engineering) of metal-halide perovskite nanocrystals have joined together to provide a state of the art overview and future prospects of metal-halide perovskite nanocrystal research.

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Section: Morphological and Structural Characterizationmentioning

confidence: 99%

State of the Art and Prospects for Halide Perovskite Nanocrystals

et al. 2021

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Introduction to the special issue on Ptychography: software and technical developments

2021

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Ptychography is an X-ray technique that achieves resolutions of one billionth of a metre, can reach a macroscopic field of view, and has the capability to retrieve chemical or magnetic contrast, among other features. It includes variants such as ptycho-tomography and spectro-ptychography, which are some of the most computationally intensive techniques being developed at X-ray light sources around the world.In the past few years ptychography has grown into a diverse landscape of methods to address ever more complex systems. These techniques involve beautiful mathematics, from harmonic analysis and algebraic geometry to complex numerical analysis.The Ptycho Developers 2019 workshop held at Berkeley Laboratory on 3-5 June 2019 was attended by 60 participants from five continents. The goal of the workshop was to bring together developers and practitioners of ptychography to assess the current landscape of available algorithms and software, investigate commonalities, and discuss a range of topics, from required theoretical and algorithmic advancements and unmet needs to practical issues of implementation and deployment. Other topics included workflows, beamlines, optics and high-performance computing solutions.Several ideas presented at the Berkeley workshop were later turned into manuscripts. These manuscripts formed the seed that grew into this virtual special issue, being complemented by diverse contributions from around the world.This special issue provides us with an opportunity to take a glimpse of some of the developments addressed in the workshop. The 14 articles it contains cover a broad variety of subjects but can be roughly divided into the following groups:(1) A new speckle-based ptychography variant is introduced by Morgan, Murray, Prasciolu et al. (2020), aimed at wavefront metrology. This is accompanied by two further manuscripts, headed by the same author: one of them (Morgan, Murray, Quiney et al., 2020) describing speckle-tracking, an open-source software package for the analysis of data from the newly developed X-ray speckle-tracking ptychography variant, and the other (Morgan, Quiney et al., 2020) showcasing its first application, aiding the fabrication of wedged multi-layer Laue lenses by providing a way to accurately characterize them.(2) Du et al. (2020) address the dose requirements of multiple X-ray microscopy techniques with detailed numerical simulations and conclude that it is the photon fluence, and not the experimental geometry, that limits the resolution of a properly conducted measurement.(3) Two manuscripts highlight a broad range of direct applications of ptychography. De Caro et al. (2020) use it to image some peculiarly shaped nanocrystals in a polymer matrix. Sala et al. (2020) show us how ptychography can be used with a range of sources and a variety of purposes by imaging the wavefront of an X-ray free-electron laser.(4) Significant advances in instrumentation are presented by three manuscripts. Khant et al. (2020) show us that NanoMAX is ready for ptycho-tomographic measuremen...

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X-ray ptychographic mode of self-assembled CdSe/CdS octapod-shaped nanocrystals in thick polymers

Cited by 2 publications

References 60 publications

State of the Art and Prospects for Halide Perovskite Nanocrystals

State of the Art and Prospects for Halide Perovskite Nanocrystals

Introduction to the special issue on Ptychography: software and technical developments

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