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Herein, three-dimensional reduced graphene oxide/helical carbon nanotubes (RGO/HCNTs) nanocomposites were synthesized by a combined solution-based method and chemical vapor deposition. This synergistic structure of graphene and helical carbon nanotube exhibited large flexibility, rapid transport kinetics, and excellent electrochemical characteristic. The hemoglobin (Hb) was immobilized on the surface of the RGO/HCNTs nanocomposites for amperometric sensing of HO. The dependence of the electrochemical performance of Hb on the composition of RGO/HCNTs composites is systematically investigated by varying the weight ratio of reduced RGO/HCNTs. Compared with alone graphene or HCNTs electrodes modified with Hb, the catalytic current for HO reduction at the Hb-modified RGO/HCNTs electrode increased due to the increase in the surface coverage of Hb and the excellent electrocatalytic activity of RGO/HCNTs. The constructed biosensor displayed a fast electron transfer of Hb and an excellent electrochemical activity for the detection of HO with high selectivity and sensitivity. [ABSTRACT FROM AUTHOR]

A combined chemical vapor deposition with high-pressure annealing has been developed for the production of phosphorus-doped helical carbon nanofibers (P-HCNFs). The resulting P-HCNFs have a large specific surface area, well-defined three-dimensional hierarchical helical structure and rapid apparent heterogeneous electron transfer. Based on the high electrocatalytic activity, the P-HCNFs were used to develop an amperometric sensor for carbendazim detection. The experimental results demonstrated that the sensor is promising for the determination of carbendazim in food samples due to the high sensitivity, wide linear range and low detection limit. [ABSTRACT FROM AUTHOR]

In this study, a novel Pd/Mn 3 O 4 /plait-like carbon nanocoils (Pd/Mn 3 O 4 /CNCs) catalyst is synthesized by a combined chemical vapor deposition and chemical reduction method. The pretreated Mn 3 O 4 nanoparticles are applied as support materials between Pd nanoparticles and CNCs template. The functional CNCs are covered by Mn 3 O 4 nanomaterials, and the metallic Pd nanoparticles are homogeneously deposited onto the Mn 3 O 4 with smaller sizes compared with those of Pd/CNCs and Pd/VX-72. The as-fabricated electrode of Pd/Mn 3 O 4 /CNCs exhibits higher catalytic activity toward the electro-oxidation of ethanol in alkaline media, more excellent poisoning tolerance, and higher stability than other electrodes. This improved performance of the as-prepared electrocatalyst originates from not only the synergetic effects between the Pd nanoparticles and Mn 3 O 4 , but also the intrinsic characteristic of CNCs. [ABSTRACT FROM AUTHOR]