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Surface microstructure regulation is an effective way to enhance the performance of sensing materials. Here, a hierarchical and flexible Brussels Sprouts-Like Ni-Co(OH)2/rGO/carbon cloth (CC) composite was constructed by optimizing the...

Dopamine (DA) is a small biological molecule that causes a variety of diseases when its concentration is abnormal. Therefore, highly sensitive detection of DA is very important for the development of biomedicine and monitoring of human health. Herein, we prepared a carbon cloth (CC)/Ti 3 C 2 T x /NiCoP composite as a highly sensitive electrochemical sensor for DA detection. Porous NiCoP was grown on the surface of CC and Ti 3 C 2 T x by hydrothermal and phosphating treatments. The composite integrated the advantages of large specific surface area of zero-dimensional NiCoP quantum dots, rich electrochemical active sites of one-dimensional porous NiCoP nanowires, hydrophilicity of two-dimensional Ti 3 C 2 T x nanosheets, and high conductivity of three-dimensional CC substrates. The sensor has high sensitivity (31.4101 μA μM −1 cm −2 ), wide detection range (0.17−784.55 μM), low detection limit (0.18 nM), elevated stability, and anti-interference ability. By analyzing the conductivity, hydrophilicity, and electrochemically active surface area of the CC/Ti 3 C 2 T x /NiCoP composite, the reasons for its excellent performances are revealed for DA detection. At present, the research on NiCoP mainly focuses on hydrogen evolution, oxygen evolution, and supercapacitor. This research provides a regulatory strategy for the application of phosphide materials in sensors.

In this work, we prepared two-dimensional hexagonal NiCo2O4 nanoplates@poly (3,4-ethylenedioxythiophene)/reduced graphene oxide (NiCo2O4@PEDOT/RGO) nanocomposite via hydrothermal method, in situ polymerization, and ultrasonic mixing, successively. The structures and properties of the composite were studied by Transmission electron microscope, Scanning electron microscopy, X-ray diffraction, Cyclic voltammograms, and Amperometric current-time method. Electrochemical studies show that the NiCo2O4@PEDOT/RGO nanocomposite has excellent H2O2 sensing performance. The sensor exhibits a wide linear detection range (0.388–44.156 mM), a low detection limit (0.031 μM, S/N = 3), and a high sensitivity (399.9434 mA mM−1 cm−2), and the response time is less than 3 s. The experimental result demonstrate that these excellent sensing properties are attributed to the NiCo2O4 simultaneous compositing with RGO and PEDOT, which enlarges the specific surface area, increases the active sites, and improves electroconductivity of the NiCo2O4. Especially, the electron transport and stability of the interface of NiCo2O4/RGO were improved via adding PEDOT. It also reveals that this sensor has high stability, outstanding reproducibility and good anti-interference. The results demonstrate that the nanocomposite is a potential electrode material for electrochemical biosensor.

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