Magic-Size II–VI Nanoclusters as Synthons for Flat Colloidal Nanocrystals

Wang, Yuanyuan; Zhou, Yang; Zhang, Ying; Buhro, William E.

doi:10.1021/ic502637q

Cited by 115 publications

(243 citation statements)

References 54 publications

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“…These precisely defined clusters can be achieved with different materials leading either to quantum platelets 120 or to quantum nanowires such as ZnTe. 129 These quantum wires exhibit similar optical properties as quantum platelets with well defined absorption peaks and unusually thin transitions.…”

Section: Ligand Templatingmentioning

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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Section: Ligand Templatingmentioning

confidence: 99%

Two-Dimensional Colloidal Nanocrystals

et al. 2016

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“…Their binding strengths are much weaker and they can be easily washed away during purification [65, 66]. While cadmium-rich QDs are typical whenever X-type ligands are used, minimizing the concentration of these ligands and including excess L-type ligands can yield a Cd:Se stoichiometry near 1:1, indicating the dominance of neutral facets on the surface [67-70]. It is also possible to prepare anion-rich QDs [71], which require an excess of Z-type ligands such as phosphines for stabilization.…”

Section: Quantum Dot Ligand Coordinationmentioning

confidence: 99%

“…Interestingly, other magic-sized clusters have been reported that seem to be distinct, either synthesized with X-type ligands to yield cadmium-rich QDs [79], or synthesized with excess L-type amines to yield neutral QDs (e.g. Cd 33 Se 33 ) [69, 70]. However, these have not been crystallized to a level suitable for X-ray crystallography presumably due to the flexibility of alkyl chains on the ligands.…”

Section: Quantum Dot Ligand Coordinationmentioning

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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“…Another report by Buhro et al. demonstrated that ZnSe nanoplates can be prepared from (ZnSe) 13 (n‐butylamine) 13 nanoclusters . Other than the direct synthetic methods, cubic ZnSe and wurtzite ZnSe spherical nanoparticles as well as wurtzite ZnSe nanorods were synthesized via a sequential cation exchange method starting from cadmium‐containing nanoparticles …”

Section: Types Of Zn‐containing Semiconductor Ncsmentioning

confidence: 99%

“…In the aspect of ZnS nanoparticles with a 2D shape, Buhro et al. assembled magic‐sized nanoclusters into stacked ZnS nanoplatelets (Figure c) . Pradhan et al.…”

Section: Types Of Zn‐containing Semiconductor Ncsmentioning

confidence: 99%

Recent Advances in Zinc‐Containing Colloidal Semiconductor Nanocrystals for Optoelectronic and Energy Conversion Applications

et al. 2019

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Colloidal semiconductor nanocrystals (NCs), especially cadmium (Cd)‐ and lead (Pb)‐containing ones, have been proved to be the promising materials for photoelectronic energy conversion applications. However, the high toxicity and cost of these materials restrict their widespread use. Zinc (Zn)‐containing colloidal semiconductor NCs are non‐/less toxic and environmentally friendly materials, manifesting in stimulating optical and electronic properties with relevance to a broad scope of applications including light‐emitting diodes (LEDs), sensors, photocatalysts, and more. In this Review, we elaborate on the shape control of Zn‐containing colloidal semiconductor NCs achieved by a variety of wet‐chemical synthetic approaches. Moreover, the formation of core‐shell, doped, and hybrid structures based on Zn‐containing colloidal semiconductor NCs allow for the optimization of their functionalities, which underpin stimulating photoelectronic energy conversion applications in quantum‐dot LEDs (QLEDs), photodetectors, and photocatalysis. Zn‐containing colloidal semiconductor NCs that combine the green chemistry with sustainable developments possess a bright future.

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Magic-Size II–VI Nanoclusters as Synthons for Flat Colloidal Nanocrystals

Cited by 115 publications

References 54 publications

Two-Dimensional Colloidal Nanocrystals

Two-Dimensional Colloidal Nanocrystals

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

Recent Advances in Zinc‐Containing Colloidal Semiconductor Nanocrystals for Optoelectronic and Energy Conversion Applications

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