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Issue 7, 2016
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In situ functionalization of self-assembled dendrimer nanofibers with cadmium sulfide quantum dots through simple ionic-substitution

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Abstract

Cadmium sulfide quantum dots (CdS-QDs) can be generated along poly(propylene imine) (PPI) dendrimer-based self-assembled nanofibers through a simple approach based on ionic substitution. Supramolecular nanofibers are obtained via self-assembly of cationic PPI dendrimers in aqueous solution containing cadmium acetate. The dissociated asymmetric acetate ions (AcO) are the “glue” for the self-assembly process. The semiconductive CdS nanoparticles are synthesized at room temperature along the self-assembled nanofibers by the addition of sodium sulphide (Na2S) in solution. Molecular dynamics (MD) simulation shows that the higher affinity of SH ions (from dissociated Na2S) for Cd2+, compared to that of AcO, triggers ionic substitution at the interface between the dendrimers. TEM and AFM measurements confirm the self-assembly of the fibers and the formation of CdS quantum dots along the filaments having a final size of ∼2 nanometers. The obtained absorbance results show the presence of quantum confinement effect. Since these self-assembled fibers can be disassembled by a simple addition of sodium chloride in solution (ionic competition), this work proposes a new facile route to obtain functional materials in a convenient way.

Graphical abstract: In situ functionalization of self-assembled dendrimer nanofibers with cadmium sulfide quantum dots through simple ionic-substitution

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Supplementary files

Article information


Submitted
16 Dec 2015
Accepted
03 May 2016
First published
04 May 2016

New J. Chem., 2016,40, 6325-6331
Article type
Paper

In situ functionalization of self-assembled dendrimer nanofibers with cadmium sulfide quantum dots through simple ionic-substitution

V. Astachov, M. Garzoni, A. Danani, K.-L. Choy, G. M. Pavan and A. Fahmi, New J. Chem., 2016, 40, 6325
DOI: 10.1039/C5NJ03580E

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