I had success in bonding PDMS to thin TiO2 films.  I did
not however measure the bond strength.

Direct Writing of Metal Nanoparticle Films Inside Sealed
Microfluidic Channels
Castellana, E. T.; Kataoka, S.; Albertorio, F.; Cremer, P.
S.
Anal. Chem.; (Article); 2006; 78(1); 107-112.

Ed

  Hi, All,

  I have a question about PDMS/Ti bonding. Does anybody
try
to do the use
  plasma treament on both pdms and Ti surface and then
bind
it? What is the
  bonding strength?