Why do gold nanoparticles form aggregates even after sonicating the colloidal sample? How we may troubleshoot? Potential causes and solutions?

I would like to know how we may confirm that the monolayer of APTES on the glass slide is uniform and/or that it is indeed a monolayer and not multi-layer coating of APTES? Even after sonicating...

14 March 2019 5,307 5 View