Weradesh Sangkhun Hi Man, thanks for your answer. Before I post the question here, I was thinking to message you and ask you directly :)
I have modified the ZnO with Silquest A-151 silane coupling agent and loaded (1 % w/v) it into PMMA solution (2 mg/mL). But I only got the contact angle about 100 degree. I want to increase it to 150 degree.
Regarding your 1st suggestion about perfluoro compounds, is perfluorosilane good enough or recommend me to use another perfluoro compounds?