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research article

Colloidal-ALD Grown Hybrid Shells Nucleate via a Ligand–Precursor Complex

Segura Lecina, Ona  
•
Hope, Michael Allan  
•
Venkatesh, Amrit  
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2022
Journal of the American Chemical Society

Colloidal atomic layer deposition (c-ALD) enables the growth of hybrid organic/inorganic oxide shells with tunable thickness at the nanometer scale around ligand-functionalized inorganic nanoparticles (NPs). This recently developed method has demonstrated improved stability of NPs and of their dispersions, a key requirement for their application. Nevertheless, the mechanism by which the inorganic shells forms is still unknown, as is the nature of the multiple complex interfaces between the NPs, the organic ligands functionalizing the surface, and the shell. Here, we demonstrate that carboxylate ligands are the key element that enables the synthesis of these core–shell structures. Dynamic nuclear polarization surface enhanced nuclear magnetic resonance spectroscopy (DNP SENS) in combination with density functional theory (DFT) structure calculations show that the addition of the aluminum organometallic precursor forms a ligand–precursor complex that interacts with the NP surface. This ligand–precursor complex is the first step for the nucleation of the shell and enables its further growth.

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Type
research article
DOI
10.1021/jacs.1c12538
Author(s)
Segura Lecina, Ona  
Hope, Michael Allan  
Venkatesh, Amrit  
Björgvinsdóttir, Snaedis  
Rossi, Kevin  
Loiudice, Anna  
Emsley, Lyndon  
Buonsanti, Raffaella  
Date Issued

2022

Published in
Journal of the American Chemical Society
Volume

144

Issue

9

Start page

3998

End page

4008

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LNCE  
LRM  
FunderGrant Number

FNS

200020_178860

Available on Infoscience
February 15, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/185553
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