NMR of nanoparticles

Widdifield, Cory M.; Kaur, Navjot

doi:10.1016/b978-0-12-823144-9.00035-2

Cited by 2 publications

(1 citation statement)

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“…Liquid-and solid-state NMR spectroscopy have been infrequently used in this research field. However, employing NMR and GPC can provide interesting insights into the chemical structure of the samples [43]. In contrast to XPS, which has frequently been employed for analysing plasma polymer NPs, 1 H NMR spectroscopy provides information about hydrogen atoms, enabling the differentiation of functional groups such as CH, CH 2 , and C=C.…”

Section: Introductionmentioning

confidence: 99%

Insoluble Network Skeleton and Soluble Components of Nylon 6,6-Sputtered Nanoparticles: Insights from Liquid-State and Solid-State NMR Analysis

Šťastná,

Škorvánková,

Kuzminova

et al. 2024

Nanomaterials

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In this study, we performed a detailed analysis of -sputtered-nylon 6,6 plasma polymer nanoparticles (NPs). Following a previous study using standard techniques such as X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy, we employed unconventional approaches, specifically solid- and liquid-state high-resolution nuclear magnetic resonance (NMR) spectroscopy, supplemented by gel permeation chromatography (GPC). Scanning electron microscopy (SEM) was also used to examine changes in the size of the NPs after contact with solvents and after heating. Our investigations revealed suspected strong binding and networking of the NPs, and a soluble monomer/oligomer phase was identified and characterised. This fraction is removable using solvent or heat treatment without significantly affecting the size of the NPs. Additionally, we suggested the chemical structure of this soluble phase. Our findings support the proposed rubber-like character of plasma polymer NPs and explain their strong tendency to reflect from substrates upon high-speed impact.

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Section: Introductionmentioning

confidence: 99%

Insoluble Network Skeleton and Soluble Components of Nylon 6,6-Sputtered Nanoparticles: Insights from Liquid-State and Solid-State NMR Analysis

Šťastná,

Škorvánková,

Kuzminova

et al. 2024

Nanomaterials

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Understanding Ion-Exchange Processes in the Synthesis of ZnS_x@ZnO_1–x Heterostructures from Controlled Sulfidation of ZnO Nanocrystals

Bellan,

Jakoobi,

Collière

et al. 2024

Chem. Mater.

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Semiconducting heterostructures are considered promising candidates for meeting specific environmental challenges, such as greener or decarbonated production of energy. However, optimizing the performance of these hybrid systems largely depends on the fine understanding of the mechanisms by which they are formed in relation to their mode of preparation. We report herein the synthesis of nanosized semiconducting heterostructures of ZnS@ZnO shell-core nature; this is from well-controlled preformed ZnO nanoparticles (NPs) modified via anion exchange process using (TMS) 2 S. The formation of these ZnS@ZnO heterostructures has been investigated in depth, shedding light specifically on the sulfidation mechanism and its dynamics. Our study reveals the dynamic evolution of the nanomaterial in the sulfidation process, evidencing that it is both driven by the initial presence of oxygen vacancies�acting as gateways for sulfur atoms�and also by the action in the medium of (TMS) 2 S, which as a sulfurizing agent behaves also as an oxygen atom extractor. The structural modification of the preformed monocrystalline ZnO nanomaterial into a polycrystalline ZnS hollow nanostructure occurs via amorphization−crystallization steps, which clearly depends on the amount of (TMS) 2 S in the reaction. This morphological transition to a hollow structure has been followed by multinuclear NMR spectroscopy ( 1 H, 13 C, 17 O), and notably oxygen atoms at the interfaces of ZnS@ZnO heterostructures have been identified and quantified. Consistently, our study clearly establishes the link between the preparation mode of the ZnS@ZnO heterostructures and the modification of their optical band gaps as a function of their composition. The variation in optical properties, and the bowing of the band gap, depends on the sulfidation level, and this mode of sulfidation is clarified step-by-step by a DFT computational approach of surface and interface processes that is fully supported by the experimental characterization (XRD, WAXS, EDX line-analysis, HRTEM, STEM-HAADF) of these materials.

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NMR of nanoparticles

Cited by 2 publications

References 145 publications

Insoluble Network Skeleton and Soluble Components of Nylon 6,6-Sputtered Nanoparticles: Insights from Liquid-State and Solid-State NMR Analysis

Insoluble Network Skeleton and Soluble Components of Nylon 6,6-Sputtered Nanoparticles: Insights from Liquid-State and Solid-State NMR Analysis

Understanding Ion-Exchange Processes in the Synthesis of ZnS_x@ZnO_1–x Heterostructures from Controlled Sulfidation of ZnO Nanocrystals

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NMR of nanoparticles

Cited by 2 publications

References 145 publications

Insoluble Network Skeleton and Soluble Components of Nylon 6,6-Sputtered Nanoparticles: Insights from Liquid-State and Solid-State NMR Analysis

Insoluble Network Skeleton and Soluble Components of Nylon 6,6-Sputtered Nanoparticles: Insights from Liquid-State and Solid-State NMR Analysis

Understanding Ion-Exchange Processes in the Synthesis of ZnSx@ZnO1–x Heterostructures from Controlled Sulfidation of ZnO Nanocrystals

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Product

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Understanding Ion-Exchange Processes in the Synthesis of ZnS_x@ZnO_1–x Heterostructures from Controlled Sulfidation of ZnO Nanocrystals