A green approach for hybrid material preparation based on carbon nanotubes/lignosulfonate decorated with silver nanostructures for electrocatalytic sensing of H2O2

We present a green and simple approach for the fabrication of multi-walled carbon nanotubes decorated with silver nanoparticles (MWCNT/LS/NAg) via lignosulfonate assisted synthesis. Due to reducing and stabilizing properties of lignosulfonate, silver nanoparticles were produced in a facile synthetic route without the addition of any reductant or toxic solvents. The existence of silver nanoparticles was confirmed through X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Atomic force microscopy (AFM) was employed to investigate the morphologies and structures of prepared functional nanomaterials. Cyclic voltammograms of the MWCNT/LS/NAg nanomaterial presented, revealed well-defined and sharp redox peaks recorded in phosphate buffer (pH = 7.4) corresponding to silver nanoparticles electroactivity. The obtained data proved that the hybrid material exhibits persistent reversible redox behavior. The hybrid nanomaterial possesses strong electrocatalytic properties toward hydrogen peroxide reduction. Based on the electrocatalytic properties of the material, the amperometric detection of H2O2 at ?0.2 V demonstrated a wide linear range of 6.00?486 ?M. The limit of detection (LOD) and limit of quantitation (LOQ) were 1.169 ?M and 3.543 ?M, respectively. Substantial electrochemical performance shows the proposed material as a promising electrochemical sensing platform for the detection of hydrogen peroxide.

Automated summary

This study developed a green and simple method for fabricating multi-walled carbon nanotubes decorated with silver nanoparticles using lignosulfonate assistance. The silver nanoparticles showed strong electrocatalytic properties towards hydrogen peroxide reduction and enabled a wide linear range for detection. The material exhibited promising electrochemical performance for hydrogen peroxide sensing applications.