Usually capping agents are used to produce nano particles without agglomeration.
I know Mr. P. Sakthivel, what I really mean is does factors like molecular weight, mole concentration of capping agent, ionic charge or maybe others factors that could affect the synthesis of nanomaterials?
Dear,
Most of factors as such concentration, charge and chemical reaction can be combined with thermodynamics which is mainly involved on selection of capping agent.
Several of the factors that you mentioned are important. Firstly, the ionic charge. If you have an ionic capping ligand you want to add, then know the charges on the constituents of your QD. For instance, if you're making CdS dots and want the ligand to bond to the Cd, choose a negatively charged group to be on your ligand, and vice versa. While ligand bonding to QDs is not straightforward, most researchers assume metal-ligand bonding behavior when making predictions.
The mole concentration of your capping agent should be close to the mole concentration of the species you want the ligand to bond with. So again with the previous example, if you're going to add .10 mmol of Cd to your reaction flask, that would be about how much ligand you would want to add.
Reading the literature for other group's synthesis routes will help you to get a feel for what factors turn out to be important.
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