Economical, green and rapid synthesis of CDs-CuO/CuO nanotube from the biomass waste reed as sensitive sensing platform for the electrochemical detection of hydrazine.

Reeds live widely in swamp and wetland and have an important ecological balance functions in environmental protection. However, the use of reeds is not effectively. The carbon dots (CDs) have been developed as the family of 0D nanocarbon materials and have all the advantages of the carbon family. In this work, we prepared CDs via hydrothermal method using reed. It is surprising that the reed-derived CDs are an effective reducing agent. A highly catalytically active composite material CDs-CuO/CuO was synthesized using economical, green, one-step ultrasonic method and used for the detection of hydrazine. The electrochemical detection of hydrazine was investigated by cyclic voltammetry. The result shows that the CDs-CuO/CuO exhibited good electrocatalytic activity for the oxidation of hydrazine. The fabricated sensor presented a wide linear range from 0.99 μM to 5903 μM and a detection limit of 0.024 μM. In addition, the CDs-CuO/CuO exhibited good sensitivity, stability and repeatability. Therefore, the CDs-CuO/CuO provides a new idea for the utilization of reed and low-cost electrocatalytic nanocomposite.