Highly efficient fluorescent film probe of hydrogen peroxide vapor.

• The new fluorescence material, DB-WCZ , served as a turn-off type fluorescent film probe to H 2 O 2 vapor with high sensitivity and selectivity. • The quenching rate of DB-WCZ films toward H 2 O 2 can play up to 62% in 120 sand the fluorescent detection limit of DB-WCZ can be as low as 2.2 ppb. • The sensing mechanism was studied in detail and proved to be attributed to the deboronation of DB-WCZ. Because of the increasing use in improvised explosives and serious influences on the public society, peroxide-based explosives are vital targets for detection. Herein, we reported two new fluorescent compounds, DB-WCZ and DB-W , served as turn-off type fluorescent film probes to H 2 O 2 (a typical substitute for TATP) vapor. Both of DB-WCZ and DB-W are fluorene-pyrene compounds linked two borate ester units. The deboronation was contributed to the fluorescence quenching during the H 2 O 2 detecting process. Compared with DB-W , DB-WCZ film shows higher selectivity and sensitivity to H 2 O 2 vapor. The quenching rate can play up to 62% in 120 s and the fluorescent detection limit of DB-WCZ can be as low as 2.2 ppb, which might be due to the pendent carbazole units to DB-WCZ to form the porous microstructures and benefit the diffusion of H 2 O 2 vapor. [ABSTRACT FROM AUTHOR]