Novel metal-organic frameworks-based hydrogen sulfide cataluminescence sensors

In the present work, a novel H2S cataluminescence (CTL) sensor based on metal-organic frameworks (MOFs) was established. Four MOFs, including MIL-100(Fe), MIL-101(Cr), Zn3(BTC)2·12H2O and ZIF-8 were tested as CTL sensing materials. Among them, MIL-100(Fe) showed high CTL intensity for H2S, but it would be damaged after CTL experiment. MIL-101(Cr) showed just a low CTL signal and also destructed after contacting with H2S. Excitingly, Zn3(BTC)2·12H2O and ZIF-8 displayed good sensitivity and stability for H2S. 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 H2S concentration have linear regression coefficients (R) of >0.99 at low concentration, which renders MOFs interesting candidates for constructing H2S CTL sensor.