Amperometric sensing of hydrazine in environmental and biological samples by using CeO2-encapsulated gold nanoparticles on reduced graphene oxide

Electrochemical Sensors Based on Au Nanoparticles Decorated Pyrene-Reduced Graphene Oxide for Hydrazine, 4-Nitrophenol and Hg2+ Detection in Water

“…The LODs of the investigated species estimated by using the proposed AuNPs/PCA-rGO/SPCEs were found lower and in line with the lowest values recently reported for similar state-of-the-art AuNPs/graphene nanocomposites synthesized by different approaches and deposited onto different electrodes (i.e., glassy carbon electrodes (GCEs)) [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ] ( Table S1 ), confirming their high electrocatalytic activity for N 2 H 4 and 4-NP analysis. It is worth noticing that with respect to state-of-the-art glassy carbon electrodes (GCEs) based sensors, our approach takes advantage of the high sensitivity and low LODs typical of the SPCEs, from their suitability for on-site use, where portable and disposable electrodes are highly demanding, and from their low cost, being low volumes of samples necessary for the analyses.…”

“…Here, the achieved hybrid modified platforms feature LODs lower or comparable with the lowest ones reported in the literature [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. Repeatability, reproducibility, storage stability, and selectivity of the electrodes, manufactured for the detection of the selected hazardous compounds in real samples of the complex aqueous matrix from tap and river water, have been assessed, supporting their technological potential for monitoring environmental threats.…”

“…Figure 4 B shows that the relationship between the concentration of Hg 2+ and the oxidation current of CM (ΔI) is linear in the investigated concentration range and a LOD of 0.62 nM was found. This value is among the lowest reported in the literature for similar nanocomposites prepared by different strategies [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ] ( Table S2 ).…”

“…The combination of the graphene derivatives with Au NPs in hybrid nanocomposites empowers interphase electron coupling, yields materials with a very large electrochemically active surface area, and enhanced heterogeneous electron transfer kinetics, resulting in a rapid and sensitive current response [ 18 , 19 , 20 ]. Therefore, nanostructured platforms formed by these hybrid nanocomposites have been applied for the electroanalytical determination of a variety of analytes, including N 2 H 4 , 4-NP, and Hg 2+ [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ].…”

Recent developments in electrochemical sensors for detecting hydrazine with different modified electrodes

“…6). 77 Nguyen et al revealed successful fabrication of a newly designed nanostructure on the basis of the hierarchical urchinlike FeCo oxide supported carbon spheres (FeCo oxide/CSs) using a 2-phase hydro-thermal procedure accompanied by a convenient annealing phase at 300 C under air. However, ndings demonstrated that this urchin-like FeCo oxide/CSs structure exhibit better catalytic activities toward the HZ oxidation to Fe oxide/CSs, FeCo hydroxide/CSs, CSs, and Co oxide/CSs materials.…”