A　new　functional　fluorinated　material　taking　n-propyltrimethoxysilicane　(n-propyl-TriMOS)　and　3,3,3-trifluoropropyltrimethoxysilicane　(TFP-TriMOS)　as　precursors　was　applied　to　construct　a　novel　dissolved　oxygen　sensing　film.　The　sensing　film　was　fabricated　by　dip-coating　the　functional　fluorinated　material-doped　[meso-tetrakis(pentafluorophenyl)　porphyinato]　platinum(II)　(PtF20TPP)　onto　a　glass　slide.　The　oxygen　sensing　film　exhibited　a　good　linear　relationship,　fast　response　time,　long　stability　and　high　sensitivity　to　dissolved　oxygen.　In　the　developed　optical　oxygen　sensor,　an　LED　and　a　photodiode　were　composed　to　construct　a　back-detection　optical　system　not　needing　an　optical　fiber　based　on　fluorescence　intensity　detection.　The　smart　optical　oxygen　sensor　based　on　the　PtF20TPP　fluorescence　quenching　possesses　the　advantages　of　portability　and　low　cost　and　can　be　applied　to　the　dissolved　oxygen　in　situ　monitoring　in　seawater.　Copyright　(C)　2009　John　Wiley　&　Sons,　Ltd.