We　describe　a　highly　sensitive　chemical　sensor　for　the　detection　of　the　hydrazine　hydrate.　The　chemical　sensor　was　synthesized　by　simply　doping　a　UiO-66　type　metal-organic　framework　(MOF)　with　Eu3+　through　a　well-known　post-synthetic　modification　method.　The　Eu3+@MOF　was　characterized　by　powder　X-ray　diffraction　(PXRD),　nitrogen　gas　adsorption　isotherm　measurements,　FTIR,　and　ICP-MS.　This　luminescent　probe　exhibits　strong　emission　intensity,　and　more　significantly,　displays　various　merits,　such　as　high　selectivity　with　notable　photoluminescence　quenching　effect,　rapid　response　time,　and　remarkable　sensitivity　with　low　detection　of　limit　for　hydrazine　recognition.　Under　the　optimal　experimental　conditions,　hydrazine　hydrate　can　be　detected　by　this　method　in　concentrations　as　low　as　0.18　μM,　which　is　much　lower　than　the　threshold　limit　value　(10　ppb,　≈0.3　μM)　of　hydrazine　exposure　recommended　by　the　U.S.　Environmental　Protection　Agency　(EPA).　More　interestingly,　a　portable　film　sensing　device　derived　from　this　MOF　display　quick　response　to　hydrazine　hydrate　within　90　s.　A　possible　luminescent　quenching　mechanism　for　hydrazine　hydrate　was　also　investigated.　©　2018　The　Royal　Society　of　Chemistry.