荧光
选择性
检出限
水溶液中的金属离子
金属有机骨架
乙醇
材料科学
化学
热稳定性
色散(光学)
金属
纳米技术
催化作用
色谱法
有机化学
冶金
吸附
物理
光学
量子力学
作者
Zhuo Zhang,Chen Li,Yuying Bian,Yuxin Han,Guang Wang
标识
DOI:10.1007/s43630-022-00288-y
摘要
A new NCDs@ZIF-90 composite as fluorescence sensor was designed and prepared by encapsulation of N-doped carbon dots (NCDs) in metal-organic framework (MOF) ZIF-90 in one-pot synthesis. NCDs@ZIF-90 retained the crystal structure and high thermal stability of ZIF-90; meanwhile, it also displayed the good chemical stability. NCDs@ZIF-90 dispersion in ethanol exhibited selective "turn-on" fluorescence response towards Al3+. The other coexisting competing metal ions had no obvious influence on the sensing performance of NCDs@ZIF-90 for Al3+. The fluorescence intensity at 447 nm of NCDs@ZIF-90 dispersion in ethanol had good linear relation with the concentrations of Al3+ with a low detection limit of 3.196 μM. The fluorescence enhancement after the addition of Al3+ was attributed to the release of NCDs from the inside of ZIF-90 to ethanol solution. In addition, NCDs@ZIF-90 displayed good recovery in detection of Al3+ in water samples indicating its practical application capability. The high selectivity and sensitivity indicate that NCDs@ZIF-90 is a good candidate as a "turn-on" fluorescence chemosensor to identify and detect Al3+.
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