Abstract
The intriguing architectures of metal-organic frameworks (MOFs), makes them an emerging class of promising materials in various application fields ranging from gas adsorption to sensing. In the present work, a three-dimensional Zn-based MOF, Zn2(BDC)2(DABCO), (H2BDC = 1,4-benzene dicarboxylic acid, DABCO = 1,4-diazabicyclo[2.2.2]octane) was prepared and its sensing behavior to metal ions was investigated by fluorescence assays. Our results show that the luminescence intensity of Zn2(BDC)2(DABCO) is strongly sensitive to Zn2+ ions. The effects of selectivity, initial concentration, the limit of detection, response time and regeneration were studied in the case of Zn2+ detection operations. The linear response to Zn2+ was obtained across the concentration range of 50–200 μM with the detection limit of 0.7 μM. The sensor also displayed excellent performance in selectivity for Zn2+ over other metal ions including Fe3+, Mn2+, Cu2+, As3+, Ni2+, Pb2+, Co2+, Al3+ and Cd2+ ions. The luminescence enhancement and recovery cycle were reiterated multiple times without much effect on the sensitivity. All the above features showed that this sensor as a sensing platform holds great potential for detection of Zn2+ with a response time of <1 min that has been rarely reported.
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