Platinum porphyrin embedded in poly(1-trimethylsilyl-1-propyne) film as anoptical sensor for trace analysis of oxygen

A highly gas permeable polymer, poly(1-trimethylsilyl-1-propyne) (poly(TMSP )), was applied as an optical oxygen sensing matrix using luminescence quen ching of platinum octaethylporphyrin (PtOEP) by oxygen. PtOEP was homogeneo usly embedded in poly(TMSP) to give a mechanically tough film with a thickn ess of 10 mum. The luminescence intensity of PtOEP embedded in the poly(TMS P) film drastically decreased with an increase in oxygen concentration. The oxygen sensitivity of the film (I-0/I-100 ) was very high and estimated to be 225. The Stern-Volmer plot for the poly(TMSP) film-embedded PtOEP was o beyed at lower oxygen concentrations between 0 and 10% and the Stern-Volmer constant is estimated to be 5.7%(-1). The limit of oxygen detection was le ss than 0.3%. The response times of PtOEP embedded in the poly(TMSP) film a re 3.6 s on going from argon to oxygen and 73.2 s on going from oxygen to a rgon, respectively. These results indicate that PtOEP embedded in the poly( TMSP) film is a novel optical sensing material for trace analysis of oxygen .