Cover Picture: Standardization and Control of Grignard Reactions in a Universal Chemical Synthesis Machine using online NMR (Angew. Chem. Int. Ed. 43/2021)

Bornemann‐Pfeiffer, Martin; Wolf, Jakob; Meyer, Klas; Kern, Simon; Angelone, Davide; Leonov, Artem; Cronin, Leroy; Emmerling, Franziska

doi:10.1002/anie.202111515

Angew Chem Int Ed

2021

DOI: 10.1002/anie.202111515

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Cover Picture: Standardization and Control of Grignard Reactions in a Universal Chemical Synthesis Machine using online NMR (Angew. Chem. Int. Ed. 43/2021)

Martin Bornemann‐Pfeiffer

Jakob Wolf

Klas Meyer

et al.

Abstract: The digitization of chemistry requires that synthesis procedures can be written and optimized in a chemical programming language to perform reliable “chemputation” for the synthesis on the “chemputer” robot, a universal synthesis machine. The cover image shows how a universal chemical synthesis engine equipped with an NMR sensor can be used to optimize reactions producing the automated synthesis procedure as an optimized process code ensuring that the chemputation can be improved and is reliable. Details are r… Show more

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Modulating the Distribution of Formamidinium Iodide by Ultrahigh Humidity Treatment Strategy for High‐Quality Sequential Vapor Deposited Perovskite

Lin,

Fang,

Yang

et al. 2023

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The quality of two‐step processed perovskites is significantly influenced by the distribution of organic amine salts. Especially, modulating the distribution of organic amine salts remains a grand challenge for sequential vapor‐deposited perovskites due to the blocking effect of bottom compact PbI2. Herein, an ultrahigh humidity treatment strategy is developed to facilitate the diffusion of formamidinium iodide (FAI) from the top surface to the buried bottom interface on the sequential vapor‐deposited bilayer structure. Both experimental and theoretical investigations elucidate the mechanism that moisture helps to i) create FAI diffusion channels by inducing a phase transition from α‐ to δ‐phase in the perovskite, and ii) enhance the diffusivity of FAI by forming hydrogen bonds. This ultrahigh humidity treatment strategy enables the formation of a desired homogeneous and high‐quality α‐phase after annealing. As a result, a champion efficiency of 22.0% is achieved and 97.5% of its initial performance is maintained after aging for 1050 h under ambient air with a relative humidity of up to 80%. This FAI diffusion strategy provides new insights into the reproducible, scalable, and high‐performance sequential vapor‐deposited perovskite solar cells.

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Modulating the Distribution of Formamidinium Iodide by Ultrahigh Humidity Treatment Strategy for High‐Quality Sequential Vapor Deposited Perovskite

Lin,

Fang,

Yang

et al. 2023

Small

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Towards automation of the polyol process for the synthesis of silver nanoparticles

Wolf

Stawski

Smales

et al. 2022

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Metal nanoparticles have a substantial impact across different fields of science, such as photochemistry, energy conversion, and medicine. Among the commonly used nanoparticles, silver nanoparticles are of special interest due to their antibacterial properties and applications in sensing and catalysis. However, many of the methods used to synthesize silver nanoparticles often do not result in well-defined products, the main obstacles being high polydispersity or a lack of particle size tunability. We describe an automated approach to on-demand synthesis of adjustable particles with mean radii of 3 and 5 nm using the polyol route. The polyol process is a promising route for silver nanoparticles e.g., to be used as reference materials. We characterised the as-synthesized nanoparticles using small-angle X-ray scattering, dynamic light scattering and further methods, showing that automated synthesis can yield colloids with reproducible and tuneable properties.

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Cover Picture: Standardization and Control of Grignard Reactions in a Universal Chemical Synthesis Machine using online NMR (Angew. Chem. Int. Ed. 43/2021)

Cited by 2 publications

References 0 publications

Modulating the Distribution of Formamidinium Iodide by Ultrahigh Humidity Treatment Strategy for High‐Quality Sequential Vapor Deposited Perovskite

Modulating the Distribution of Formamidinium Iodide by Ultrahigh Humidity Treatment Strategy for High‐Quality Sequential Vapor Deposited Perovskite

Towards automation of the polyol process for the synthesis of silver nanoparticles

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