期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 27, 页码 30770-30778出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06291
关键词
MOFs; ratiometric electrochemical sensor; bifunctional MOFs; Cu2+
资金
- National Natural Science Foundation of China [21864026, 21605130, 21465026]
- Natural Science Foundation of Yunnan Province [2016FD017, 2018FB016]
In this study, a ratiometric electrochemical sensor based on metal-organic frameworks (MOFs) was developed for sensing of multiplex metal ions. The bifunctional MOFs were prepared in a way to integrate two signal tags and a detection probe. In the presence of target metal ions, the target metal ions can replace the framework metal-ion center in the original MOFs through an ion-exchange reaction, leading to ratiometric electrochemical signals under different applied potentials. One consisted of the Cu2+ signal generated from electroactive MOFs selected as internal reference signals. The other consisted of the signal induced by other target metal ions. Using the I-metal ions/ICu2+ signal as the output, the prepared ratiometric probe was able to eliminate disturbance caused by the sensing environment. Moreover, the large surface area and abundant active sites in MOFs produced a multiplex ratiometric electrochemical sensor with improved characteristics in terms of reproducibility, stability, and sensitivity. The sensor was also simple without sophisticated instrumentation, amplification processes, or an acid dissolution/preconcentration procedure, hence promising for practical applications.
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