Facile hydrothermal synthesis NiHPO_3·H_2O nanorods, influencing factors, and transformation toward Ni-NiO composite nanostructures, catalytic properties and application in sensing for glucose

摘要

We designed a direct and simple route, based on a thermal decomposition method under normal atmospheric pressure for obtained Ni-NiO nanorods from NiHPO_3·H_2O nanorods structures, the uniform precursor. This process includes the synthesis of the precursor through a facile hydrothermal approach and subsequently thermal decomposition of the precursor under air atmosphere. Some factors influencing the precursor of the NiHPO_3·H_2O nanorods structures were systematically investigated. After the heat treatment, the as-synthesized Ni-NiO nanorods with a well retained structure and the catalytic performance were investigated. It was found that the Ni-NiO nanorods exhibited good catalytic activity for the reduction of 4-ni-trophenol (4-NP) to 4-aminophenol (4-AP) in excess NaBH_4 solution. Furthermore, experiments showed that the as-prepared Ni-NiO nanorods presented high electrochemical response with low detection limit (0.254 μM), wide linear range (0.25-1.75 mM) (R~2 = 0.99918) and high selectivity in 0.1 mol L~(-1) NaOH solution and could be used as an electrochemical sensor for the detection of glucose.