In　this　work,　a　multi-functional　nanoparticle　(TiO2-KH570-DOPO)　has　been　successfully　synthesized　through　the　attachment　of　9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide　(DOPO)-methacryloxy　propyl　trimethoxyl　silane　on　the　surface　of　titanium　dioxide　(TiO2).　Supercritical　carbon　dioxide　was　used　as　the　solvent　in　order　to　increase　the　grafting　level.　The　chemical　structure　of　TiO2-KH570-DOPO　was　fully　characterized　using　Fourier　transform　infrared　spectra,　thermogravimetric　analysis　and　transmission　electron　microscopy.　The　modified　TiO2　was　incorporated　into　flexible　polyurethane　foam　(FPUF).　The　fire　performance　of　FPUF　blends　was　evaluated　using　microscale　combustion　calorimetry.　Peak　heat　release　rate　and　total　heat　release　values　were　reduced　from　657.0　W/g　and　28.9　kJ/g　for　neat　FPUF　sample　to　519.2　W/g　and　26.8　kJ/g　of　FPUF　specimen　containing　10　wt　%　of　TiO2-KH570-DOPO.　Analysis　of　thermal　stability　and　the　observation　of　char　formation　suggests　that　TiO2-KH570-DOPO　is　active　in　the　condensed　phase.