Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 914, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2022.116323
Keywords
Chloride ion; Metal organic frameworks; Polydopamine; Silver nanoparticles; Sweat analysis
Categories
Funding
- National Natural Science Foundation of China [21727815, 21890740, 21890742]
- National Natural Science Foundation of China, TUBITAK (Turkey) -NSFC (China) Bilateral Cooperation Program [82061138005]
- Shenzhen Key Laboratory for Nano-Biosensing Tech-nology [ZDSYS20210112161400001]
- SZU Top Ranking Project [86000000210]
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A novel electrochemical sensor based on ZIF-67/Ag NPs/PDA nanocomposites for chloride ion sensing is reported in this study. The nanocomposites exhibited a yolk-shell structure with a porous surface, and the oxidation of dopamine played a crucial role in their formation. The electrochemical sensor showed a strong dependence on chloride ion concentration, and it has promising potential for cystic fibrosis diagnosis.
In this study, a novel electrochemical sensor based on ZIF-67/Ag NPs/PDA nanocomposites for sensing of chloride ion with good reproducibility is reported. The ZIF-67/Ag NPs/PDA nanomaterials were prepared through reducing a pre-prepared precursor ZIF-67/Ag+ with dopamine (DA), accompanied by oxidation-of-DA-induced etching of ZIF-67. The resultant ZIF-67/Ag NPs/PDA nanocomposites had a yolk-shell structure and a characteristic porous surface with a diameter ranging from 400 nm to 600 nm. The oxidation of DA was found to play a crucial role for the formation of the core-shell-structured ZIF-67/Ag NPs/PDA nanocomposites. Furthermore, comparative experiments showed the critical role of the presence of a PDA coating in enhancing the stability of Ag NPs sandwiched between the PDA coating and the underlying ZIF-67 substrate. The as-prepared electrochemical sensor exhibited a near Nernst-equation relationship versus Cl-ion concentration ranging from 2 mM to 400 mM with a limit of detection (LOD) of 1 mM. Meanwhile, the as-prepared electrochemical sensor showed good response reproducibility for Cl- determination, indicating a promising potential for chloride determination for cystic fibrosis diagnosis.
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