Anthraquinone Functionalized Ionic Liquid Based Disposable Electrochemical Sensor for the Enzyme-Free Detection of Hydrogen Peroxide

Abstract

A simple and selective enzyme-free electrochemical sensor for H2O2 has been designed and fabricated using ionic liquid (IL) tagged anthraquinone (AQ) modified electrode (AQ-PF6-IL). This newly synthesized AQ- PF6-IL has been systematically characterized, after which it has been immobilized over a screen-printed electrode to produce AQ-PF6-IL/SPE. The electrochemical investigation of AQ-PF6-IL/SPE displayed a set of distinct redox peaks attributable to the anthraquinone/anthrahydroquinone redox pair. Interestingly, AQ-PF6-IL/SPE has shown enhanced peak current at reduced formal potential for AQ, when compared to AQ/SPE. Further, the electrocatalytic activity of AQ-PF6-IL/SPE towards the reduction of H2O2 was investigated with the sequential addition of H2O2. A rapid and appreciable enhancement in cathodic peak currents was observed and thus demonstrating the excellent electrochemical reduction of H2O2 at the newly developed sensor. Besides, AQ-PF6-IL/SPE established a good linear behaviour over a concentration range of 10-1228 μM with a high sensitivity of 0.281 μA μM-1 cm-2 and low detection limit of 2.87 μM. The fabricated sensor displayed excellent stability, good anti-interference ability, and acceptable reproducibility. The superior properties of the developed sensor could be attributed to the newly designed AQ-PF6-IL, wherein the redox characteristics of AQ mediator are integrated with the high stability and conductivity of IL.

A Novel Pentachlorophenol Electrochemical Sensor Based on Nickel-Cobalt Layered Double Hydroxide Doped with Reduced Graphene Oxide Composite

“…This was attributed to the successful interaction between the present catalyst and 5-CP molecule due to the synergic effect between the organicinorganic hybrid (rGO-CuO) and NiCo-LDH. 48,49 A linear plot was drawn between changes in current and the concentrations of 5-CP and it is almost linear (Fig. 5b), which is expressed in the following equation I (μA) = 0.0125 C(μM)+0.7796 (R 2 = 0.98876).…”

Green Synthesis of Copper Oxide Nanoparticle Decorated Polypyrrole-Chitosan on Pencil Graphite Electrode for Enzyme-Free Glucose Sensors

“…[26][27][28][29] When it is performed with the green synthesis method developed in recent years, it provides superior surface properties and surface morphology compared to other methods. 30,31 In the green synthesis method, nanoparticles are synthesized by using biological and inorganic materials together. 32 For this purpose, the conversion of metal ions into nanoparticles can be achieved thanks to the reductive metabolites in the content of substances such as many plant essences, algae, algae, fungi, etc.…”

Performances of Nano-Structured Cu2O Thin Films Electrochemically Deposited on ITO Substrates in Lactate Bath as Liquid Petroleum Gas Sensors

“…Literature reports, among the semiconducting metal oxides like SnO 2 , In 2 O 3 , Fe 2 O 3, ZnO, WO 3 , TiO 2, Cu 2 O, V 2 O 5 , CuO, etc. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] Cuprous Oxide (Cu 2 O) is an ideal material for researches due to its advantageous in non-toxicity, mechanical, electrical, and catalytic properties and the natural abundance of the base material. [20][21][22][23][24][25][26][27][28] At present, a variety of techniques exist to synthesize Cu 2 O with different microstructures on selected substrates, including thermal oxidation with copper sheets at 200 °C/1050 °C, chemical vapor deposition with alumina slides at 300 °C, magnetron DC sputtering on glass at 693 K, radio, anodic oxidation on glass at 280 °C29-33 etc.…”