“…This implies that chemical interaction between the silica substrate and coated PDMS was weak. It is worth noting that the coating of PDMS thin films can be achieved on other substrates such as TiO 2 , ZnO, SiO 2 , Ni, and carbon using the same method as used in the present study, showing that the PDMS layer can form on the surface independent of the surface structure . This also indicates that the interaction of PDMS and the substrate surface can be regarded as weak van der Waals interactions.…”