期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 904, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.115923
关键词
Ion selective electrodes; Potentiometric sensor; Copper ion; Conductive MOF
资金
- National Natural Science Foundation of China [21974031, 21974032, U2006208, 21805052, 21627809]
- China Postdoctoral Science Foundation [2020M672568]
- Department of Science and Technology of Guangdong Province [2019B010933001]
The conductive metal organic framework (MOF) demonstrates efficient electron transfer ability and ion recognition. An ISM-free SC-ISE based on this conductive MOF shows high sensitivity and short response time for Cu2+ detection, offering normal potentiometric responses even under short conditioning time.
The conductive metal organic framework (MOF) discloses efficient electron transfer ability and its specific framework structure could realize ion recognition. The state-of-the-art solid-contact ion-selective electrodes (SC-ISEs) rely on both solid contact (SC) and ion-selective membrane (ISM) for respective functions of ion-to-electron transduction and ion recognition. Herein, we report an ISM-free SC-ISE by using the conductive MOF of Cu-3(HHTP)(2) (Cu as metallic nodes and 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) as triph-enylene-based organic linkers) as a bifunctional role of SC and ISM for Cu2+ sensing. The experimental results demonstrated a Nernstian and selective response to Cu2+ with a slope of 29.5 +/- 0.3 mV dec(-1). Compared with traditional Cu2+-ISM-based SC-ISEs, the potentiometric response time has been greatly reduced from similar to 50 s to 10 s. Moreover, the ISM-free conductive MOF could offer normal potentiometric responses even under a short conditioning time in solution (minutes). In addition, organic solvent tolerance has also been proved for the ISM-free conductive MOF-based SC-ISE. This work demonstrates that the MOF could be feasible for constructing a type of ISM-free solid potentiometric ion sensors.
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