A Novel Cerium Tungstate Nanosheets Modified Electrode for the Effective Electrochemical Detection of Carcinogenic Nitrite Ions

Abstract

In this present scenario, for the first time, we propose a facile and simple wet chemical approach for the fabrication of two‐dimensional (2D) cerium tungstate (CeW2O9;CeW) nanosheets and evaluated as an electrochemical sensor for the detection of nitrite ions. The successful formation of CeW2O9 nanosheets was confirmed by various physicochemical techniques such as X‐ray diffraction, Fourier transform infrared spectroscopy, Raman, Scanning electron microscope, Transmission electron microscope and Energy dispersive X‐ray studies. The electrochemical properties of the CeW nanosheets were studied by using cyclic voltammograms (CV) and chronoamperometric techniques. As an electrochemical sensor, the CeW nanosheets modified glassy carbon electrode (GCE) showed superior electrocatalytic activity in the oxidation of nitrite in terms of higher anodic peak current and lower oxidation potential when compared with unmodified GCE. CeW nanosheets based electrochemical sensor has been fabricated which detect nitrite in wide linear response range, good sensitivity and very low detection limit of 0.02–986 μM, 2.85 μA μM−1 cm−2 and 8 nM, respectively. Moreover, the CeW nanosheets modified GCE exhibited excellent selectivity even in the presence of common metal ions and biologically co‐interfering compounds. For the practical viability of the prepared amperometric sensor has been utilized in various water samples such as tap, lake and drinking water and the obtained recoveries are appreciable.

Gold Nanoparticle-Modified Tungsten Oxide Flakes as Nitric Oxide Sensor Electrodes for Fruit Quality Monitoring

“…The linear regression equation for ν 1/2 vs I pa plot can be written as I pa (μA) = 142.76 ν 1/2 + 901.08 with a correlation coefficient of 0.982. Our study confirmed that the NO oxidation at the WO 3 -90 electrode is diffusion-controlled . The repeatability of the Au-WO 3 sensing electrode was tested with 50 cycles of CV scan with 100 mV/s scan rate, and a very small change in oxidation current has been observed (Figure S4, Supporting Information).…”

Electrochemical Detection of Nitrite Using an Asymmetrically Substituted Cobalt Phthalocyanine Conjugated to Metal Tungstate Nanoparticles

“…The choice of Bi 2 WO 6 and NiWO 4 is influenced by the fact that the use of small metals such as Bi in MWO x results in a narrower band gap, which has been found to be beneficial in electrocatalysis of reactions such as oxygen reduction reaction [15, 17, 18]. Metal tungstate nanoparticles have previously been reported for the detection of analytes including nitrite [2, 6, 19]. This work explores the covalent conjugation of bismuth‐tungsten (Bi 2 WO 6 ) and nickel‐tungsten (NiWO 4 ) nanoparticles (NPs) to a cobalt phthalocyanine molecule (CoPc).…”

Electrochemical Analysis of Sulfisoxazole Using Glassy Carbon Electrode (GCE) and MWCNTs/Rare Earth Oxide (CeO2 and Yb2O3) Modified-GCE Sensors

“…From the other hand, it plays a role in reducing the effect of interferents. Recently, hybrid nanostructured materials have been widely employed in sensing applications thanks to their high surface area, reasonable biocompatibility, catalytic activity, chemical stability, and high electrical conductivity [ 25 , 26 , 27 , 28 , 29 ]. Carbon nanotubes (CNTs) and compared to the other carbon electrodes are found to be advantageous in terms of sensitivity, selectivity, response time, reusability, and the resistance to surface fouling [ 30 , 31 ].…”