Deciphering ligands' interaction with Cu and Cu2O nanocrystal surfaces by NMR solution tools
Arnaud Glaria1, Jérémy Cure, Kilian Piettre
1LCC-CNRS (Laboratoire de Chimie de Coordination), 205, route de Narbonne, BP44099, 31077 Toulouse (France).
Hexadecylamine (HDA) ligands protect copper nanocrystals from oxidation, while tetradecylphosphonic acid (TDPA) ligands accelerate their degradation. This highlights ligand choice
Area of Science:
- Nanomaterials Science
- Surface Chemistry
- Colloidal Chemistry
Background:
- Copper nanocrystals are synthesized via hydrogenolysis of a copper precursor in toluene.
- Ligand shells form multilayered structures around nanoparticles, influenced by intermolecular interactions and binding strength.
- Air oxidation of copper nanocrystals is a dynamic process influenced by surface chemistry.
Purpose of the Study:
- To investigate the role of different ligands, hexadecylamine (HDA) and tetradecylphosphonic acid (TDPA), in the air oxidation of copper nanocrystals.
- To elucidate the surface chemistry of copper nanoparticles during oxidation using solution NMR spectroscopy.
- To understand how ligand properties affect the stability and corrosion protection of copper nanocrystals.
Main Methods:
- Synthesis of 6-9 nm copper nanocrystals through hydrogenolysis.
- Utilizing solution Nuclear Magnetic Resonance (NMR) spectroscopy to monitor nanoparticle surface chemistry.
- Comparative analysis of oxidation rates under ambient atmosphere with HDA and TDPA ligands.
Main Results:
- Hexadecylamine (HDA) ligands provide efficient corrosion protection for the copper core by strongly coordinating to surface Cu(I) sites.
- Tetradecylphosphonic acid (TDPA) ligands result in rapid oxidation of copper nanoparticles.
- TDPA ligands promote the re-dissolution of copper(II) species, leading to nanocrystal degradation.
Conclusions:
- The chemical nature of ligands critically dictates the oxidation rate and stability of colloidal copper nanocrystals.
- Primary amine ligands like HDA offer superior corrosion protection compared to phosphonic acid ligands like TDPA.
- Understanding ligand-nanoparticle interactions is crucial for controlling the stability and application of copper nanocrystals.
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