Solution scattering from colloidal curved plates: barrel tiles, scrolls and spherical patches

Constantin, Doru

doi:10.1107/s1600576715020695

Cited by 5 publications

(7 citation statements)

References 18 publications

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“…Thus, the characteristic scattering wave fluctuation curve is caused by the presence of isolated NPLs from the decomposition of sheet stacking structures. 31 Such a result agrees well with the corresponding absorption spectra shown in panel b2 of Figure 1, which exhibit the characteristic absorption doublets at 373/ 393 nm. In panel a3 of Figure 1, the scattering fluctuation at low q tends to weaken gradually by heating the sample from 170 to 240 °C, which is attributed to the decomposition of NPLs.…”

supporting

confidence: 89%

“…For the sample at 250 °C/5 min, only the unified model is used for construction. The form factor of cylinder platelets provides the various sizes of 2D particles, 31 and the parameters of dMSCs derived from the unified model provide the size and shape of 0D particles in the solution system, with more details shown in the Supporting Information. The simulation and verification of the fluctuation signal by different size parameters for NPLs are shown in Figures S2-1 of the Supporting Information.…”

Section: The Journal Of Physical Chemistry Lettersmentioning

confidence: 99%

“…It can be roughly estimated that these particles are larger than 53 nm because the SAXS experiment does not reach its Guinier regime and the maximum length scale detected is 2π/ q min = 53 nm. Thus, the characteristic scattering wave fluctuation curve is caused by the presence of isolated NPLs from the decomposition of sheet stacking structures . Such a result agrees well with the corresponding absorption spectra shown in panel b2 of Figure , which exhibit the characteristic absorption doublets at 373/393 nm.…”

mentioning

confidence: 99%

“…SAXS signals are attributed to the presence of a large number of small size particles and a small part of large size NPLs at the same time. Thus, a two-level structure model, containing the cylinder platelet model , and the unified model, , is constructed for the sample at 170 °C/5 min. For the sample at 250 °C/5 min, only the unified model is used for construction.…”

mentioning

confidence: 99%

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Transformation Pathway from CdSe Nanoplatelets with Absorption Doublets at 373/393 nm to Nanoplatelets at 434/460 nm

Cao

Zhu

Peng

et al. 2022

J. Phys. Chem. Lett.

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For those colloidal semiconductor CdSe nanospecies that exhibit sharp optical absorption doublets, different explanations have appeared in the literature regarding their morphological nature and formation, with no consensus reached. Here, we discuss the transformation pathway in two types of CdSe nanoplatelets (NPLs), from NPL-393 to NPL-460, exhibiting absorption doublets at 373/393 and 433/460 nm, respectively. Synchrotronbased small/wide-angle X-ray scattering (SAXS/WAXS) was performed to monitor the in situ transformation associated with the temperature. Combining the results of SAXS/WAXS, optical spectroscopy, and transmission electron microscopy, we propose that the transformation pathway experiences corresponding magic-sized clusters (MSCs), which display similar optical properties but with zero-dimensional structure. From stacked NPL-393 to stacked NPL-460, the transformation goes through sequentially individual NPL-393, MSC-393, MSC-460, and individual NPL-460 at their corresponding characteristic temperature. The present findings provide compelling evidence that both MSCs and their assembled NPLs exhibit similar optical absorption.

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supporting

confidence: 89%

Section: The Journal Of Physical Chemistry Lettersmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Transformation Pathway from CdSe Nanoplatelets with Absorption Doublets at 373/393 nm to Nanoplatelets at 434/460 nm

Cao

Zhu

Peng

et al. 2022

J. Phys. Chem. Lett.

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“…We attribute these oscillations to the bending of the NPLs which depart from their flat geometry to yield tubes or scrolls as was shown previously. 12−14 To confirm this hypothesis, we computed the form factor of curved platelets with reasonable dimensions 44 (see Supporting Information for the calculation details) and noticed that indeed, marked oscillations appear in the 0.1−1 nm −1 region of the SAXS pattern when the radius of curvature is low enough. For a 30 × 60 nm plate, oscillations start to appear when the radius of curvature goes below 20 nm.…”

Section: Nano Lettersmentioning

confidence: 93%

Insights into the Formation Mechanism of CdSe Nanoplatelets Using in Situ X-ray Scattering

et al. 2019

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Two dimensional ultra thin CdSe nanoplatelets have attracted a large interest due to their optical properties but their formation mechanism is not well understood. Several 1 different mechanisms have been proposed: confined growth in a surfactant mesophase acting as a template, anisotropic ripening of small seeds into 2D nanoplatelets or continuous anisotropic growth of a limited number of nuclei. However, quantitative in situ data that could validate or disprove these formation scenarios are lacking. We use synchrotron-based small-angle and wide-angle X-ray scattering to probe the formation mechanism of CdSe nanoplatelets synthesized using a heating-up method. We prove the absence of a molecular mesophase in the reactive medium at the onset of nanoplatelet formation ruling out a templating effect. We also show that our data are inconsistent with the anisotropic ripening of small seeds whereas the evolution of the SAXS patterns during the reaction is consistent with the continuous lateral growth of nanoplatelets fed by reactive monomers. Finally, we show that when the final temperature of the synthesis is lowered, nanoplatelets with larger lateral dimensions form. We unravel that they bend in solution during their growth to yield nanoscrolls.

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Ligand Tail Controls the Conformation of Indium Sulfide Ultrathin Nanoribbons

Guillemeney,

Dutta,

Valleix

et al. 2024

J. Am. Chem. Soc.

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We report the conformational control of 2D ultrathin indium sulfide nanoribbons by tuning their amine ligands' alkyl chain. The initial orthorhombic InS nanoribbons bare n-octylamine ligands and display a highly curved geometry with a characteristic figure of eight shapes. Exchanging the native ligand by oleylamine induces their complete unfolding to yield flat boardshaped nanoribbons. Significant strain variations in the InS crystal structure accompany this shape-shifting. By tuning the linear alkyl chain length from 4 to 18 carbon atoms, we show using small-angle X-ray scattering in solution and transmission electron microscopy that the curvature of the nanoribbon subtly depends on the ligand−ligand interactions at the nanoribbon's surface. The curvature decreases gradually as the chain length increases, while carbon unsaturation has an unexpectedly significant effect at constant chain length. These experiments shed light on the critical role of the ligand monolayer on the curvature of ultrathin 2D crystalline nanosheets and demonstrate that weak supramolecular forces within the organic part of colloidal nanocrystals can dramatically impact their shape. This transduction mechanism, in which changes in the organic monolayer impact the shape of a nanocrystal, will help to devise new strategies to design stimuli-responsive systems that take advantage of both the flexibility of organic moieties and the physical properties of the inorganic core.

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Solution scattering from colloidal curved plates: barrel tiles, scrolls and spherical patches

Abstract: I provide analytical or semi-analytical expressions for the smallangle scattering of colloidal objects that can be described as curved plates. These models could help characterize a variety of inorganic or biological systems.

Cited by 5 publications

References 18 publications

Transformation Pathway from CdSe Nanoplatelets with Absorption Doublets at 373/393 nm to Nanoplatelets at 434/460 nm

Transformation Pathway from CdSe Nanoplatelets with Absorption Doublets at 373/393 nm to Nanoplatelets at 434/460 nm

Insights into the Formation Mechanism of CdSe Nanoplatelets Using in Situ X-ray Scattering

Ligand Tail Controls the Conformation of Indium Sulfide Ultrathin Nanoribbons

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