Selective and Sensitive Nitrite Sensor Based on Glassy Carbon Electrode Modified by Silver Nanochains

Abstract

Herein, we report a facile method for the synthesis of silver nanochains (Ag nanochains) using pyridine as growth directing agent and citrate ions as capping agents in alkaline medium. The characterization of the synthesized high aspect ratio Ag nanochains was accomplished with the help of Transmission Electron Microscopy (TEM) and High Resolution Transmission Electron Microscopy (HRTEM) which demonstrates the thickness below 100 nm. Crystalline nature of the synthesized Ag nanochains was investigated using X‐ray diffractrometry. A sensitive electrochemical nitrite sensor was assembled using synthesized Ag nanochains as electrode modifier. An improved cyclic voltammetric response for the oxidation of nitrite ions was witnessed at the modified GCE surface in comparison to bare GCE in Britton Robinson (BR) buffer (pH 4). The influence of pH on the oxidation peak current of nitrite ions was also examined using cyclic voltammetry. The electrocatalytic oxidation currents attained through amperometric measurements at Ag nanochains modified GCE were linearly dependent on the concentration of nitrite ions in the two ranges of 0.5–7.5 µM, 5–480 µM. Linear calibration plots of Ip vs. concentration of nitrite were also constructed at the proposed sensor using square wave voltammetry and differential pulse voltammetry. The proposed sensing strategy was successfully employed for the determination of nitrite in water samples with excellent recoveries.

Development of an Innovative Nitrite Sensing Platform Based on the Construction of an Electrochemical Composite Sensor of Polymer Coated CNTs and Decorated with Magnetite Nanoparticles

“…Based on these data, the analytical parameters are improved compared to other nitrite sensors reported in the literature. This is manifested in lower detection limit (DL), and wide linear response range as illustrated in (Table 4), [14, 40–48]. We conclude that the sensing performance and the figures of merit of the sensor; sensitivity, detection limit, anti‐interference ability and stability toward nitrite detection are improved compared to bare GC and GC/CNT electrodes due to the perfect combination between CNTs, PEDOT and Fe 3 O 4 nanoparticles with their unique properties.…”

Development of a novel electrochemical nitrite sensor based on Zn‐Schiff base complexes

“…In this regard, the oxygen delivery capacity of hemoglobin will be severely restricted. [9][10][11] Considering these points, it is critical to create a simple, rapid, and sensitive way to detect NO 2 À .…”

Electrochemical Determination of Nitrite by Au Nanoparticle/Graphene-Chitosan Modified Electrode

“…When its concentration is high in the blood, it can combine with hemoglobin. In this case, the oxygen delivery capacity of hemoglobin will be severe restricted [ 1 , 8 , 9 ]. Lethal concentrations of NO 2 − intake proposed by the World Health Organization (WHO) are in the range of 8.7 × 10 −6 –2.83 × 10 −5 mol/L [ 2 ].…”

“…Among them, the electrochemical techniques, due to their convenient operation, low cost, fast response and high sensitivity, have aroused wide interest. Nevertheless, the conventional electrode has large electrochemical oxidation overpotential during the detection of NO 2 − , and the electrode has the possibility of being destroyed by the products produced during the electrochemical process [ 5 , 9 , 17 ]. In order to resolve these problems, Antonella Curulli et al prepared a platinum electrode modified with cellulose acetate or poly(1,8-diaminonaphthalene) film, which enables simple and rapid detection of nitrite and nitrate [ 18 ].…”