Abstract
The present work synthesized MIL-101(Cr)-SO3H on the surface of rGO in situ with polyethyleneimine (PEI) as an intermediate linker to prepare MIL-101(Cr)-SO3H/PEI-rGO composite. Furthermore, a new dopamine electrochemical sensor was successfully constructed based on the composite. The morphological and structural characteristics of MIL-101(Cr)-SO3H/PEI-rGO were investigated by scanning electron microscope (SEM), X-ray powder diffractometer (XRD), X-ray photoelectron spectrometer (XPS), and Fourier transform infrared spectrometer (FTIR), which revealed that the MIL-101(Cr)-SO3H spheres were uniformly anchored on PEI-rGO surface. The findings indicate that MIL-101(Cr)-SO3H particles can be effectively stabilized and prevented from agglomeration by means of in-situ growth on rGO surface with PEI as an intermediate linker. Electrochemical studies proved that the proposed dopamine sensor possessed a linear range, limit of detection and sensitivity of 0.25–238.75 μM, 0.07 μM and 327.7 μA mM−1 cm−2 respectively. The results reveal that MIL-101(Cr)-SO3H/PEI-rGO is a promising electrode modification material.
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