Assume we have to deposit gold nanoparticles prepared using thiols as capping ligand and I wish to deposit it onto the SiO2. To use them for catalysis I need to remove the ligand, which will eventually result in agglomeration of gold nanoparticles. What are the strategies to avoid this?
Modify the silica surface with thiol groups. Adsorb the nanoparticles with citrate as ligand for instance. By the way, removing thiols from the gold nanoparticle surface will be hard.
Why put the ligand on if you have to remove it? Simply start with chloroauric acid, absorb on the support, and then reduce with an appropriate reducing agent e.g. hydrazine hydrate, H2, citrate etc...
I hope you need to consider the issues related to solvent polarity (of thiols) and surface charge of the nano particles.
Check the temperature (work at lower temperature to see if it solves the problem), the concentration/the ionic strength.
Put pluronic F-127 as a polymer in the AuNPs colloid. it will cover NPs. Pluronic stop agglomeration of NPs.
study the following article
Article Biocompatible Au@Carbynoid/Pluronic-F127 nanocomposites synt...
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