Two-Dimensional Growth of CdSe Nanocrystals, from Nanoplatelets to Nanosheets

Bouet, Cécile; Mahler, Benoît; Nadal, Brice; Abécassis, Benjamin; Tessier, Martine; Ithurria, Sandrine; Xu, Xiujuan; Dubertret, Benoît

doi:10.1021/cm304080q

Cited by 138 publications

(206 citation statements)

References 40 publications

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“…The CdSe/CdS core-shell nanoplatelets studied here are nanoparticles that have perfectly defined and controlled thicknesses, but whose lateral sizes can be tuned [35]. This allows rectangular and square core/shell nanoplatelets to be synthetized (this synthesis is described in the Electronic Supplementary Material (ESM)).…”

Section: Methodsmentioning

confidence: 99%

Consequence of shape elongation on emission asymmetry for colloidal CdSe/CdS nanoplatelets

et al. 2018

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In this paper, we demonstrate that for colloidal CdSe/CdS nanoplatelets, a rectangular shape induces emission asymmetry, in terms of both polarization and emission patterns. Polarimetry and emission pattern analyses are combined to provide information on the orientation of the transition dipoles involved in the nanoplatelet emission. It is shown that for rectangular nanoplatelets, the emission is polarized and the emission patterns are anisotropic, whereas they remain nonpolarized and isotropic for square nanoplatelets. This can be appropriately described by the dielectric antenna effect induced by the elongated shape of the rectangular platelet.

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Section: Methodsmentioning

confidence: 99%

Consequence of shape elongation on emission asymmetry for colloidal CdSe/CdS nanoplatelets

et al. 2018

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“…130 These 2D nanoparticles 127,131,132 have been named nanoribbons, nanobelts, 118 nanosheets, nanoplatelets 13 (NPLs) by the different groups. 133 What makes them appealing is their anisotropic growth controlled at the atomic scale.…”

Section: The Case Of Zinc-blende Cadmium Chalcogenides Nanoplateletsmentioning

confidence: 99%

“…136 The lateral extension also strongly depends on the thickness of the NPL. Thinner NPLs tend to present a larger lateral extension, up to the point where they are able to roll on themselves 132,137 (see Figure 21 b). …”

Section: The Case Of Zinc-blende Cadmium Chalcogenides Nanoplateletsmentioning

confidence: 99%

Two-Dimensional Colloidal Nanocrystals

et al. 2016

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Abstract:In this paper, we review recent progresses on colloidal growth of 2D nanocrystals.We identify four main sources of anisotropy which lead to the formation of plate-and sheetlike colloidal nanomaterials. Defect induced anisotropy is a growth method which relies on the presence of topological defects at the nanoscale to induce 2D shapes objects. Such a method is particularly important in the growth of metallic nanoobjects. Another way to induce anisotropy is based on ligand engineering. The availability of some nanocrystal facets can be tuned by selectively covering the surface with ligands of tunable thickness. Cadmium chalcogenides nanoplatelets (NPLs) strongly rely on this method which offers atomic control in the thinner direction, down to a few monolayers. 2D objects can also be obtained by post or in situ self-assembly of nanocrystals. This growth method differs from the previous ones in the sense that the elementary objects are not molecular precursors, and is a common method for lead chalcogenide compounds. Finally, anisotropy may simply rely on the lattice anisotropy itself as it is common for rod-like nanocrystals. Colloidally grown Transition Metal DiChalcogenides (TMDC) in particular result from such process. We also present hybrid syntheses which combine several of the previously described methods and other paths, such as cation exchange, which expand the range of available materials. Finally, we discuss in which sense 2D-objects differ from 0D nanocrystals and review some of their applications in optoelectronics, including lasing and photodetection, and biology.

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“…The found absorption and emission bands for ZB-CdSe NSs are comparable to those for the CdSe nanoplatelets by the Dubertret group. [20][21][22] The sharp absorption and emission features of the CdSe NSs clearly demonstrate that the origin must be structures which are strongly in confinement. We also measured the quantum yield (QY) in respect to the standard quinine sulfate.…”

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Size, Shape, and Phase Control in Ultrathin CdSe Nanosheets

Gerdes¹,

Navío

Juárez

et al. 2017

Nano Lett.

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Ultrathin two-dimensional nanosheets raise a rapidly increasing interest due to their unique dimensionality-dependent properties. Most of the two-dimensional materials are obtained by exfoliation of layered bulk materials or are grown on substrates by vapor deposition methods. To produce free-standing nanosheets, solution-based colloidal methods are emerging as promising routes. In this work, we demonstrate ultrathin CdSe nanosheets with controllable size, shape and phase. The key of our approach is the use of halogenated alkanes as additives in a hot-injection synthesis. Increasing concentrations of bromoalkanes can tune the shape from sexangular to quadrangular to triangular and the phase from zinc blende to wurtzite. Geometry and crystal structure evolution of the nanosheets take place in the presence of halide ions, acting as cadmium complexing agents and as surface X-type ligands, according to mass spectrometry and X-ray photoelectron spectroscopies. Our experimental findings show that the degree of these changes depends on the molecular structure of the halogen alkanes and the type of halogen atom.Comment: 24 pages, 6 figure

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Two-Dimensional Growth of CdSe Nanocrystals, from Nanoplatelets to Nanosheets

Cited by 138 publications

References 40 publications

Consequence of shape elongation on emission asymmetry for colloidal CdSe/CdS nanoplatelets

Consequence of shape elongation on emission asymmetry for colloidal CdSe/CdS nanoplatelets

Two-Dimensional Colloidal Nanocrystals

Size, Shape, and Phase Control in Ultrathin CdSe Nanosheets

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