One-pot green synthesis of palladium doped reduced graphene oxide composite for electrochemical determination of hydrogen peroxide
Turunç, Ersan
In the present study, a modified electrosensor based on one-pot green synthesized palladium doped reduced graphene oxide composite (Pd@rGO) has been developed for the electrochemical determination of hydrogen peroxide. The electrochemical features of the electrosensor was appraised by cyclic voltammetry (CV) and differential puls voltammetry (DPV) techniques. The Pd@rGO modified glassy carbon electrode exhibited a superior electroactivity as against to unmodified glassy carbon electrode (GCE). It demonstrated a superior performance toward hydrogen peroxide in the concentration range of 10 μM and 1.0 mM with a detection limit of 0.12 μM. The selectivity of the sensor was investigated in the presence of various biological interferents like glucose, ascorbic acid, dopamine, paracetamol and u...
Green Synthesis of Reduced Graphene Oxide Decorated with Silver Nanoparticles Using Onosma bracteosa Leaf Extract for Efficient Electrochemical Detection of Hydrogen Peroxide
Turunç, Ersan | Binzet, Rıza
In this study, a simple, cost-effective and eco-friendly method was performed for the production of silver nanoparticle decorated reduced graphene oxide (rGO-Ag) nanocomposite using Onosma bracteosa leaf extract as reducing and stabilizing agent. The structure of the synthesized rGO-Ag nanocomposite was characterized by UV–Vis, XRD, SEM, TEM, EDX, and XPS. The synthesized rGO-Ag nanocomposite was used to fabricate an electrochemical sensor (rGO-Ag@GCE) for the determination of hydrogen peroxide. Electrochemical reduction of hydrogen peroxide was performed using DPV on rGOAg@GCE in 0.1 M PBS. The rGO-Ag@GCE exhibited good response in the linear concentration range of 25 µM to 800 µM, with a LOD of 0.11 µM. Amperometric measurements showed that the prepared sensor did not have a significant ...
Synthesis, characterization and sensing application of HNTs@ Pd-MoS2 ternary composite
Turunç, Ersan
In the current study, halloysite nanotube@palladium-molybdenum disulfide ternary composite (HNTs@Pd-MoS2) was synthesized. The characterization of HNTs@Pd-MoS2 ternary composite were carried out by Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), Transmission electron micrsocopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) analysis and X-ray photoelectron spectroscopy (XPS). The as-synthesized HNTs@Pd-MoS2 ternary composite was utilized to prepare a sensor for electrochemical determination of dopamine. For this purpose, glassy carbon electrode (GCE) was modified with HNTs@Pd-MoS2 composite (HNTs@Pd-MoS2/GCE), and the modified electrode was utilized for electrochemical determination of dopamine in phosphate buffer solutions. ...
Enhanced electrochemical sensing of nitrite ions in water samples using hydroxyapatite-zinc oxide nanocomposite modified carbon paste electrode
Turunç, Ersan | Binzet, Rıza
This study reports the green synthesis of a hydroxyapatite‑zinc oxide (HAp-ZnO) nanocomposite using Onosma mersinana leaf extract (OMLE) and its application as a highly sensitive electrochemical sensor for nitrite ion detection. The structural and surface characteristics of the synthesized nanomaterial were confirmed by XRD, which revealed crystalline phases corresponding to both HAp and ZnO; SEM analysis showed uniform morphology; EDX confirmed elemental composition; and XPS identified chemical states of Zn, O, Ca, C, and P, verifying successful ZnO doping. The HAp-ZnO nanocomposite was incorporated into a carbon paste electrode (CPE) to fabricate the CPE@HAp-ZnO100 sensor for the electrochemical detection of nitrite. The electrochemical behavior of nitrite on the CPE@HAp-ZnO100 electrode...