I am trying to dip coat a glass into the sol-gel derived solution. But, the sufficient adhesion is not achieved after drying and annealing. What is the best pre-treatment to active the glass surface for the next sol-gel dip coating?
You should predict enough time after dipping and before drying to complete
the gelation process, because incompleted glation facilitates the volatilization of alkoxides which have not been condensed, so this one weakens the structure and adhesion by substrate.