Tremella-like ZIF-67/rGO as electrode material for hydrogen peroxide and dopamine sensing applications

[Display omitted] •The synthetic method of ZIF-67/rGO was simple and environmentally friendly.•Synthetic ZIF-67/rGO showed a porous tremella shape.•The tremella-like ZIF-67/rGO could effectively detect both dopamine sensor and hydrogen peroxide sensor. In this study, we developed a simple and environmentally friendly approach to synthesizing a composite material comprising cobalt-based zeolitic imidazolate framework-67 and reduced graphene oxide (ZIF-67/rGO). The morphology and composition of the composite material prepared were investigated by scanning electron microscopy, powder X-ray diffraction, and N2 absorption–desorption. Evidence indicated ZIF-67/rGO to be a porous tremella-like shape with a diameter of 4 μm. This material was employed to fabricate a modified electrode that was tested as a hydrogen peroxide and dopamine sensor. Results from electrochemical experiments indicated that both hydrogen peroxide and dopamine sensors had linearity ranges of five magnitudes with sensitivity of 51.9 μA mM−1 cm−2 and 93.7 μA mM−1 cm−2, respectively. Moreover, the detection limit of the hydrogen peroxide and dopamine sensors were determined to be 1.57 μM and 0.052 μM severally. The results indicated that tremella-like ZIF-67/rGO modified electrodes can be efficiently used for sensing applications.