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(A) Graphical representation for the synthesis of (A) zinc–glutamate MOF, (B) MXene, and (C) MOF-MXene nanocomposite. (D) Electrochemical sensing of melatonin and its amperometric response. (E) Scheme for the fabrication of band-aid based prototype melatonin sensor. (F) Photograph of prototype sensor connected to the portable potentiostat. (G) Various real samples analyzed. Reproduced with permission from [80].
