Inorganic Surface Ligands for Colloidal Nanomaterials

Nag, Angshuman; Zhang, Hao; Janke, Eric M.; Talapin, Dmitri V.

doi:10.1515/zpch-2014-0604

Cited by 50 publications

(56 citation statements)

References 61 publications

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“…103 In a generic method that allows the preparation of a large variety of MCCs, bulk metal chalcogenide is dissolved in hydrazine with excess chalcogenide. 103 In a generic method that allows the preparation of a large variety of MCCs, bulk metal chalcogenide is dissolved in hydrazine with excess chalcogenide.…”

Section: Ligand Orbital Mixingmentioning

confidence: 99%

“…toluene) are mixed with an immiscible polar solvent containing the ions (i.e. 103 Many NC based devices contain rectifying P-N junction which rely on stable electron-rich (n-type) NCs in addition to better investigated hole-rich (p-type) NC. 108 The ligand exchange is easily monitored as the (coloured) S 2À passivated NCs phase transfer into the polar solvent.…”

Section: Ligand Orbital Mixingmentioning

confidence: 99%

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Linking surface chemistry to optical properties of semiconductor nanocrystals

Krause

Kambhampati

2015

Phys. Chem. Chem. Phys.

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The intricate chemistry occurring at the surface of semiconductor nanocrystals is crucial to tailoring their optical properties to a myriad of applications. This perspective aims to re-evaluate long held ideas in semiconductor nanocrystal surface science in the light of a body of new and rich research. We start by reviewing recent developments in ligand chemistry, followed by a discussion of spectroscopic and computational approaches used for advancing the poorly-understood electronic structure of the surface. With the insights gained, we show how the surface impacts emissive behaviour and we summarize strategies to increase fluorescent quantum yield. This discussion is followed by a review of experimental approaches for quantitative analysis of the surface chemistry at concentrations relevant to spectroscopic measurements. We end by highlighting some new directions in ligand chemistry, namely all-inorganically passivated semiconductor nanocrystals and new applications of surface emission.

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Section: Ligand Orbital Mixingmentioning

confidence: 99%

Section: Ligand Orbital Mixingmentioning

confidence: 99%

Linking surface chemistry to optical properties of semiconductor nanocrystals

Krause

Kambhampati

2015

Phys. Chem. Chem. Phys.

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“…The ligand exchange between the existing ligand and a new one is generally based on a two-step stripping route in which the existing ligand is replaced by the new once, typically displaying higher affinity and stronger binding to the targeted surface. Ligand exchange [6,195,211,222,240,251,255,[275][276][277][278][279][280][281][282][283][284] is required to replace insulating organic surfactants and allow charge transport in nanocrystal solids as well as to prepare water-soluble nanocrystals that target specific cellular sites.…”

Section: Nanocrystal-ligand Interactions and Ligands Exchange Dynamicsmentioning

confidence: 99%

“…In this regard, a novel and fascinating approach for the post-functionalisation of nanocrystals, among which also metal sulphide colloids, is based on the use of inorganic ligands [279]. In particular, various inorganic anions including metal-free chalcogenides, oxoanions/oxometallates, and halides/ pseudohalides/halometallates have been employed to replace the original long-chain organic ligands on NCs.…”

Section: Applications-oriented Functionalisation Of Transition Metal mentioning

confidence: 99%

Functionalisation of Colloidal Transition Metal Sulphides Nanocrystals: A Fascinating and Challenging Playground for the Chemist

2017

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Abstract:Metal sulphides, and in particular transition metal sulphide colloids, are a broad, versatile and exciting class of inorganic compounds which deserve growing interest and attention ascribable to the functional properties that many of them display. With respect to their oxide homologues, however, they are characterised by noticeably different chemical, structural and hence functional features. Their potential applications span several fields, and in many of the foreseen applications (e.g., in bioimaging and related fields), the achievement of stable colloidal suspensions of metal sulphides is highly desirable or either an unavoidable requirement to be met. To this aim, robust functionalisation strategies should be devised, which however are, with respect to metal or metal oxides colloids, much more challenging. This has to be ascribed, inter alia, also to the still limited knowledge of the sulphides surface chemistry, particularly when comparing it to the better established, though multifaceted, oxide surface chemistry. A ground-breaking endeavour in this field is hence the detailed understanding of the nature of the complex surface chemistry of transition metal sulphides, which ideally requires an integrated experimental and modelling approach. In this review, an overview of the state-of-the-art on the existing examples of functionalisation of transition metal sulphides is provided, also by focusing on selected case studies, exemplifying the manifold nature of this class of binary inorganic compounds.

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“…10 His group has over the years demonstrated that, with these modifications, charge mobility in nanoparticle superlattices can be greatly enhanced. 10 His group has over the years demonstrated that, with these modifications, charge mobility in nanoparticle superlattices can be greatly enhanced.…”

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confidence: 99%