An efficient method for the surface functionalization of luminescent quantum dots with lipoic acid-based ligands

We describe an operationally advantageous general methodology to efficiently activate lipoic acid-based compounds - a family of popular surface ligands for semiconductor nanocrystals - by the use of a borohydride exchange resin, and the use of the activated species to replace the native surface liga...

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Bibliographic Details
Main Authors: Marcello La Rosa, Tommaso Avellini, Christophe Lincheneau, Serena Silvi, Iain Wright, Edwin C. Constable, Alberto Credi
Format: Default Article
Published: 2017
Subjects:
Inorganic chemistry not elsewhere classified
Other chemical sciences not elsewhere classified
CdSe
Nanoparticle
Phase transfer
Semiconductor nanocrystal
Solubility
Chemical Sciences not elsewhere classified
Inorganic Chemistry
Online Access:https://hdl.handle.net/2134/26613
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Summary:We describe an operationally advantageous general methodology to efficiently activate lipoic acid-based compounds - a family of popular surface ligands for semiconductor nanocrystals - by the use of a borohydride exchange resin, and the use of the activated species to replace the native surface ligands of quantum dots. The procedure enables the phase transfer of the nanocrystals between polar and aqueous media and, if unsubstituted lipoic acid is used, a facile adjustment of their solubility in a wide range of solvents with varying polarity (from hexane to water). We show that the protocol is applicable to different types of nanocrystals and a variety of lipoic acid-based ligands, and that the resulting quantum dots maintain their optical properties - in particular, an intense luminescence - and long term colloidal stability.

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