Application of Graphdiyne and Gold Nanoparticles Nanocomposite Modified Electrode for the Detection of 7-Hydroxy-6-Methoxy-Hydrocoumarin, A Natural Compound

Abstract

In this paper, a graphdiyne (GDY) and gold nanoparticles (AuNPs) nanocomposite was formed with AuNPs growing on the surface and between the layers of GDY, which was used as the sensing interface on carbon ionic liquid electrode (CILE) to detect 7-Hydroxy-6-methoxy-hydrocoumarin (7-6-HDC) that isolated from the Noni juice of Hainan Island. The GDY-Au nanocomposite was characterized by different spectroscopic techniques, which exhibited corrugated and folded morphology with large specific surface area. The electrochemical properties of 7-6-HDC on the modified electrode were further studied with calculated based on direct electrochemical investigation and electrochemical kinetics. The GDY-Au modified electrode displayed excellent results that attributed to the highly conductive nanocomposite, where GDY structure with defects could immobilize more AuNPs to decrease the electron transfer resistance. Under the optimum conditions, GDY-Au/CILE gave a wide range of 7-6-HDC of 0.01 μM–1000.0 μM with a low detection limit (3.22 nM, 3S₀/S) as well as higher sensitivity (0.97 µA/(M•cm²)).

Keywords: Graphdiyne, Au nanoparticles, 7-Hydroxy-6-methoxy-hydrocoumarin, Carbon ionic liquid electrode