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Synthesis and Characterization of Amphiphilic Gold Nanoparticles

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Phosphonic and sulfonic acid-functionalized gold nanoparticles: a solid-state NMR study.

Petr Fiurasek¹, Linda Reven

¹Centre for Self-Assembled Chemical Structures (CSACS), Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, Canada H3A 2K6.

Langmuir : the ACS Journal of Surfaces and Colloids

|February 21, 2007

Summary

Gold nanoparticles capped with MUP and MDS ligands show distinct molecular behaviors. MUP ligands form ordered, stable monolayers, while MDS ligands exhibit reversible disordering near room temperature.

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Area of Science:

Nanotechnology
Materials Science
Surface Chemistry

Background:

Gold nanoparticles (AuNPs) are widely used in various applications.
Surface ligands critically influence nanoparticle properties and assembly.
Understanding ligand behavior on nanoparticle surfaces is essential for tailored applications.

Purpose of the Study:

To compare the conformational and dynamic properties of 11-mercaptoundecanylphosphonic acid (MUP) and sodium 10-mercaptodecanesulfonic acid (MDS) capping ligands on gold nanoparticles.
To investigate the thermal stability and ordering of these ligand monolayers.
To assess the utility of solid-state 31P NMR for probing ligand-surface interactions.

Main Methods:

Characterization of MUP- and MDS-capped gold nanoparticles.
Utilized solid-state 31P and 13C Nuclear Magnetic Resonance (NMR) spectroscopies.
Analyzed ligand conformation, dynamics, and thermal behavior.

Main Results:

MDS-capped AuNPs exhibit ordered monolayers with reversible disordering above room temperature, contrasting with disordered layers on planar surfaces.
MUP-capped AuNPs display highly ordered, motionally restricted alkyl chains due to hydrogen bonding.
MUP monolayer order is thermally stable, persisting until decomposition and desorption.
Solid-state 31P NMR effectively probes interactions of phosphonic acid terminal groups.

Conclusions:

Ligand structure and bonding significantly impact molecular ordering and dynamics on gold nanoparticle surfaces.
MUP ligands form robust, ordered monolayers on AuNPs, suitable for applications requiring stable surface functionalization.
MDS ligands offer tunable surface properties with temperature-dependent ordering.
Solid-state NMR is a powerful tool for characterizing ligand behavior on nanomaterials.