Self-assembled ZnO microspheres coated with carbon dot-doped CoNi LDH wrinkled films as electrochemical sensors for highly sensitive detection of hydrazine. Issue 3 (22nd December 2022)

• Record Type: Journal Article
• Authors: Zhang, Yu; Wu, Jiaying; Zhao, Shan; Tang, Xin; He, Zhiyuan; Huang, Ke; Yu, Huimin; Zou, Zhirong; Xiong, Xiaoli
• Is Part Of: Analytical methods. Volume 15:Issue 3(2023)
• Page Start: 304
• Page End: 310
• Publication Date: 2022-12-22
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/d2ay01698b
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : Surface folded composites were prepared in situ using CoNi LDH hybrid films loaded with nitrogen-doped carbon dots on self-assembled ZnO microspheres (ZnO@CoNi LDH-NCDs). It acts as an electrode which has excellent sensing performance for hydrazine. Abstract : In this study, a 3D surface-folded composite was prepared in situ as a hydrazine sensor by loading a hybrid film of CoNi-layered double hydroxides (LDHs) with nitrogen-doped carbon dots on self-assembled ZnO microspheres. The nanocomposite was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), and the electrochemical behavior of the sensors was investigated by cyclic voltammetry (CV), amperometry and electrochemical impedance spectroscopy (EIS). The results showed that ZnO microspheres with nitrogen-doped carbon dots strongly coupled with LDHs can significantly reduce the charge transfer resistance, accelerate the oxidation kinetics of hydrazine, and effectively increase the electrochemically active surface area (ECSA). The sensor achieved ultra-sensitive (13 040 μA mM −1 cm −2 (S/N = 3)) detection of hydrazine in the concentration range of 0.7 μM to 4 mM, exhibited excellent selectivity, reproducibility and high stability, and was successfully applied to the determination of hydrazine in actual environmental water samples and landfill leachate samples.