Gold Nanoparticles Decorated Graphene as a High Performance Sensor for Determination of Trace Hydrazine Levels in Water

Abstract

Electrochemical sensors provide a selective, sensitive and an easy approach to detect hazardous substances such as hydrazine. Herein, we investigate a facile route for the fabrication of a nanostructured composite based on Au nanoparticles (AuNPs) decorated graphene and present its sensing performance towards hydrazine. Our strategy involves electrophoretic deposition (EPD) of graphene oxide (GO) on Au substrate to obtain a uniform layer EPD‐GO, followed by electrochemical reduction of GO to yield high quality graphene ERGO and electrodeposition of monodispersed AuNPs on ERGO (AuNPs/ERGO/Au). The modified AuNPs/ERGO/Au electrode was characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT‐IR) techniques. The sensor exhibited an improved catalytic activity with a peak potential of +87 mV (vs. Ag/AgCl) for hydrazine oxidation. The high performance of this hybrid electrode is due to the presence of a synergistic effect between AuNPs and ERGO at their interface. Insights into the mechanism and kinetics of hydrazine oxidation are withdrawn from varying the voltage scan rate as the reaction is fully irreversible and diffusion‐controlled. The proposed hydrazine sensor showed suitability for nanomolar detection (detection limit of 74 nM), high selectivity in the presence of common ions and efficiency for application in water samples.

A paper-based inkjet-printed PEDOT:PSS/ZnO sol-gel hydrazine sensor

“…The results showed that there is no statistical difference in obtained hydrazine concentration values from different real samples. Our results are satisfactory and match the recovery values of hydrazine sensors previously reported in the literature [46,47], evidencing that the proposed printed sensor is a good candidate for the determination of hydrazine in real water samples.…”

An Electrochemical Sensor Based on Gold and Bismuth Bimetallic Nanoparticles Decorated L-Cysteine Functionalized Graphene Oxide Nanocomposites for Sensitive Detection of Iron Ions in Water Samples

“…The surface morphologies of the various modified electrodes were characterized by SEM and EDX ( Figure 1 ). Compared with the surface of the GO/GCE ( Figure 1 A), SH-GO/GCE ( Figure 1 B) surface showed more folds [ 37 ], and these large specific surface areas provide a larger adhesion area for the loading of metal nanoparticles. At the same time, it is also beneficial to the complete contact between electrolyte and electrode surface [ 38 ].…”

Growth of diazonium-functionalized ZnO nanoflakes on flexible carbon cloth for electrochemical sensing of acetone in the liquid phase

“…On the other hand, electrochemical sensors offer an efficient, easy-to-use, sensitive, and simple approach to detecting an analyte of interest in the liquid phase. 14,15…”

“…On the other hand, electrochemical sensors offer an efficient, easy-to-use, sensitive, and simple approach to detecting an analyte of interest in the liquid phase. 14,15 Some nanomaterial-modied electrodes have been reported for the quantication of acetone. For instance, metal oxides, such as TiO 2 , SnO 2 , Co 3 O 4 , Ag 2 O, W 18 O 49 , ZnO, and WO 3 , due to their intrinsic catalytic behavior and tunable size and shapes, have been extensively used for the development of acetone sensors.…”