Binary nanophase of bimetal organic frameworks/graphene nanoribbon for extremely sensitive dopamine detection

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Electrochemical detection of dopamine in low concentration with some interferents has driven increasing interest in the development of material capable of delivering high sensitivity. In this work, a novel Ni-Zn bimetallic organic framework (Ni 3 /Zn-BTC)/graphene nanoribbon (GONR) was synthesized via a relatively simple strategy. The Ni 3 /Zn-BTC@GONR31 (the ratio of Ni 3 /Zn-BTC and GONR is 3:1) exhibited excellent electrochemical sensing of dopamine (DA), due to the synergic effect of the Ni 3 /Zn-BTC and GONR. Under the optimal conditions, a wide linear range of 0.4–350 μM, a low limit of detection (LOD) of 3.8 nM (S/N = 3), and a response time of 0.5 s were achieved. This electrochemical sensing system has good anti-interference capability, selectivity, repeatability, and reproducibility. Theoretical calculations revealed that the combination of Ni 3 /Zn-BTC and GONR could optimized intermediate adsorption, facilitated electron transfer and reduced the energy barrier for DA oxidation. The recovery (98.6%–101.0%) and reasonable relative standard deviation (RSD) (1.14% - 1.35%) for determination of real samples indicate it is promising for future applications of the sensing system. The Ni 3 /Zn-BTC@GONR31 exhibited outstanding electrochemical sensing of dopamine performance, under the optimal conditions, a wide linear range of 0.4–350 μM, a low limit of detection of 3.8 nM, and a response time of 0.5 s were achieved. • A novel Ni/Zn-BTC@GONR was synthesized at room temperature without templates, etchants, or high-pressure conditions. • Ni 3 /Zn-BTC@GONR31 exhibited outstanding electrocatalytic activity toward DA with a wide linear range, a low limit of detection, and a quick response time. • Ni 3 /Zn-MOF@GONR31 has a satisfactory practicability for the accurate determination of DA in real environmental lake water.

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