Highly sensitive electrochemical dopamine sensor based on a highly stable In-based metal-organic framework with amino-enriched pores
To.design a highly stable and sensitive metal-organic framework(MOF)electrochemical sensor for detect-ing dopamine(DA),we selected indium-based MOF[In(2-NH3-BDC)(2-NH2-BDC)]·1.5H2O(RSMOF-1,RSMOF=resistance switchable metal-organic framework,2-NH2-H2BDC=2-amino terephthalic acid)to modify the glassy car-bon electrode(RSMOF-1/GCE).The DPV test results of the prepared electrode RSMOF-1/GCE showed a linear range of 0.990-663 μmol·L-1 and a detection limit of 0.770 μmol·L-1.In the presence of various interfering sub-stances(uric acid,urea,glucose,acetaminophen),RSMOF-1/GCE still exhibited high selectivity towards DA.The theoretical simulation results demonstrated that the—NH2 on the inner wall of the RSMOF-1 pore can enhance interaction with DA molecules through hydrogen bonding,indicating its sensitive electrochemical sensing perfor-mance for DA.
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