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...
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.
In this work, we used graphene oxide (GO) as a template that was removed by calcination to finally successfully prepare Co3O4 with 2D porous nanostructure. The results show that 2D porous structure Co3O4 nanosheets were only prepared at pH = 2. After electrochemical tests, the as-prepared Co3O4 nanosheets showed electrochemical properties that are highly suitable for H2O2 detection, such as high current response, short response time (less than 3 s), wide linear range (0.388–44.156 mM), low limit of detection (2.33 μM) and high sensitivity (0.0891 mA mM−1 cm−2). These excellent properties are mainly due to GO, as a 2D template, which connects Co3O4 nanoparticles to each other on a 2D plane, preventing the agglomeration of Co3O4 nanoparticles. The abundant pores between Co3O4 nanoparticles can greatly increase the reaction between the nanoparticles and H2O2 molecules.
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