Pyramid-Shaped Wurtzite CdSe Nanocrystals with Inverted Polarity

Ghosh, Sandeep; Gaspari, Roberto; Bertoni, Giovanni; Spadaro, Maria Chiara; Prato, Mirko; Turner, Stuart; Cavalli, Andrea; Manna, Liberato; Brescia, Rosaria

doi:10.1021/acsnano.5b03636

Cited by 30 publications

(40 citation statements)

References 56 publications

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“…(d) Clovers formed through self-assembly of the NPYs where the nonpolar lateral facets congregate inward with the polar basal facets pointing outward. Reproduced from ref ( 59 ). Copyright 2015 American Chemical Society.…”

Section: Semiconductor Nanocrystalsmentioning

confidence: 99%

“…The CdSe NPYs with reversed polarity, when exploited to grow CdS pods, led to such a peculiar structure. 59 The seeded growth method was carried out in the presence of chloride ions introduced as CdCl 2 and is schematically represented in Figure 22 a. The as-prepared branched NCs exhibited an unusual rocket-like shape with a dominant central asymmetric pod and three shorter pods emanating from its base.…”

Section: Semiconductor Nanocrystalsmentioning

confidence: 99%

“…For instance, this strategy has been used to suppress homogeneous nucleation in the synthesis of rod-shaped and branched NCs starting from preformed NC seeds. 11 , 58 , 59 …”

Section: Introductionmentioning

confidence: 99%

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The Many “Facets” of Halide Ions in the Chemistry of Colloidal Inorganic Nanocrystals

2018

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Over the years, scientists have identified various synthetic “handles” while developing wet chemical protocols for achieving a high level of shape and compositional complexity in colloidal nanomaterials. Halide ions have emerged as one such handle which serve as important surface active species that regulate nanocrystal (NC) growth and concomitant physicochemical properties. Halide ions affect the NC growth kinetics through several means, including selective binding on crystal facets, complexation with the precursors, and oxidative etching. On the other hand, their presence on the surfaces of semiconducting NCs stimulates interesting changes in the intrinsic electronic structure and interparticle communication in the NC solids eventually assembled from them. Then again, halide ions also induce optoelectronic tunability in NCs where they form part of the core, through sheer composition variation. In this review, we describe these roles of halide ions in the growth of nanostructures and the physical changes introduced by them and thereafter demonstrate the commonality of these effects across different classes of nanomaterials.

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Section: Semiconductor Nanocrystalsmentioning

confidence: 99%

Section: Semiconductor Nanocrystalsmentioning

confidence: 99%

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The Many “Facets” of Halide Ions in the Chemistry of Colloidal Inorganic Nanocrystals

2018

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“…The CN of an atom in the interior of a tetrahedrally coordinated nanocrystal is 4, whereas a surface atom is missing one bond (CN=3) or two bonds (CN=2). An atom with CN=1 is usually considered to constitute an adatom, a high energy atomic configuration that will either be readily removed due to weak associations or migrate to a different set of surface facets [29], although exceptions have been observed when using chloride ion ligands with CN=1 Cd 2+ -terminated facets [30]. As shown in Fig.…”

Section: Quantum Dot Crystal Facetsmentioning

confidence: 99%

“…WZ and ZB domains can also exist on the same QD to yield a polytypic crystal [23], and lower symmetry facets beyond those shown in Fig. 2 can also be present such as {404̄5} WZ [30], which together provide a high degree of QD facet and shape diversity [32]. …”

Section: Quantum Dot Crystal Facetsmentioning

confidence: 99%

Quantum dot surface engineering: Toward inert fluorophores with compact size and bright, stable emission

Lim

Schleife

et al. 2016

Coordination Chemistry Reviews

109

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The surfaces of colloidal nanocrystals are complex interfaces between solid crystals, coordinating ligands, and liquid solutions. For fluorescent quantum dots, the properties of the surface vastly influence the efficiency of light emission, stability, and physical interactions, and thus determine their sensitivity and specificity when they are used to detect and image biological molecules. But after more than 30 years of study, the surfaces of quantum dots remain poorly understood and continue to be an important subject of both experimental and theoretical research. In this article, we review the physics and chemistry of quantum dot surfaces and describe approaches to engineer optimal fluorescent probes for applications in biomolecular imaging and sensing. We describe the structure and electronic properties of crystalline facets, the chemistry of ligand coordination, and the impact of ligands on optical properties. We further describe recent advances in compact coatings that have significantly improved their properties by providing small hydrodynamic size, high stability and fluorescence efficiency, and minimal nonspecific interactions with cells and biological molecules. While major progress has been made in both basic and applied research, many questions remain in the chemistry and physics of quantum dot surfaces that have hindered key breakthroughs to fully optimize their properties.

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Anisotropic3DColloidal Quantum Nanostructures

Govan¹,

Spiridonov

Fëdorov

et al. 2016

Encyclopedia of Inorganic and Bioinorganic Chemistry

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3D anisotropic semiconductor nanostructures have unique physical properties including a high aspect ratio, optical polarization anisotropy, polarized photoluminescence, giant birefringence, and many others. Theoretical studies of anisotropic semiconductor nanostructures have shown that their electronic and optical properties dramatically depend on their shape and size. These factors open up an access to new generation of optical, optoelectronic, and light‐harvesting devices. In this article, we demonstrate advances in the development of new 3D quantum‐confined colloidal nanostructures such as semiconductor nanotetrapods, nanomultipods, nanoflowers, nanostar and other shapes. We present the latest progress in various colloidal chemistry approaches for the synthesis of these nanostructures. We also consider the self‐organization of quantum dots in 3D superparticles. We discuss structure–property relations as well as the corresponding potential applications of these nanomaterials in light‐harvesting, energy‐conversion devices, sensing, photocatalysis, biology, and other areas. Finally, we provide conclusions and an outlook for the future development of anisotropic semiconductor nanomaterials and their technological prospects.

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Pyramid-Shaped Wurtzite CdSe Nanocrystals with Inverted Polarity

Cited by 30 publications

References 56 publications

The Many “Facets” of Halide Ions in the Chemistry of Colloidal Inorganic Nanocrystals

The Many “Facets” of Halide Ions in the Chemistry of Colloidal Inorganic Nanocrystals

Quantum dot surface engineering: Toward inert fluorophores with compact size and bright, stable emission

Anisotropic3DColloidal Quantum Nanostructures

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