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Novel metal-organic frameworks-based hydrogen sulfide cataluminescence sensors

Xiangyu Wan,Liqian Wu,Lichun Zhang,Hongjie Song,Yi Lv

In the present work, a novel H 2 S cataluminescence (CTL) sensor based on metal-organic frameworks (MOFs) was established. Four MOFs, including MIL-100(Fe), MIL-101(Cr), Zn 3 (BTC) 2 ·12H 2 O and ZIF-8 were tested as CTL sensing materials. Among them, MIL-100(Fe) showed high CTL intensity for H 2 S, but it would be damaged after CTL experiment. MIL-101(Cr) showed just a low CTL signal and also destructed after contacting with H 2 S. Excitingly, Zn 3 (BTC) 2 ·12H 2 O and ZIF-8 displayed good sensitivity and stability for H 2 S. Then, the CTL characteristics and optimal parameters of these two MOFs were investigated in detail and the possible CTL mechanism was also discussed. Under the optimized conditions, the calibration curves of CTL intensity versus H 2 S concentration have linear regression coefficients ( R ) of >0.99 at low concentration, which renders MOFs interesting candidates for constructing H 2 S CTL sensor.