Fabrication of Carbon Paste Electrodes Modified with Multi-walled Carbon Nanotubes for the Potentiometric Determination of Chromium(III)

In this study, synthesis and electrochemical sensor application of flower-like MoS2 for sunset yellow FCF sensing were evaluated. Linear sweep voltammetry (LSV), chronoamperometry and differential pulse voltammetry (DPV) were used to determine flower-like MoS2 electrochemical sensor performances, which had LOD of 0.04 μM in the linear working range of 0.1–150.0 μM calculated from DPV. The sensor was successfully applied for the determination of sunset yellow FCF in real samples.

Section: Introductionmentioning

confidence: 99%

Flower-like MoS2 screen-printed electrode based sensor for the sensitive detection of sunset yellow FCF in food samples

Jahani

2022

“…In recent years, modified electrodes have had many applications in various fields, including sensing, electrocatalysis, fuel cells, batteries and supercapacitors [36][37][38][39][40][41][42][43][44][45][46][47][48]. Chemical modification of electrodes with various materials such as nanomaterials, single molecular, multi-molecular, ionic, and polymeric components provides electrocatalytic properties in terms of increasing active surface area and accelerating electron transfer kinetics, which is beneficial for electrochemical sensing applications [49][50][51][52][53][54][55][56][57][58][59][60][61].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical detection of folic acid using a modified screen printed electrode

Mohammadi

Mohammadhasani-Pour

2022

In this work, an electrochemical sensor was established for the detection of folic acid based on Ni-BTC (BTC = benzene-1,3,5-tricarboxylic acid) metal-organic framework (MOF) modified screen-printed electrode (SPE). Electrochemical techniques (cyclic voltammetry (CV), differential pulse voltammetry (DPV), linear sweep voltammetry (LSV) and chronoamperemetry (CHA) were used for the detection of folic acid at Ni-BTC MOF modified SPE. The results indicate that the as-prepared sensor has a good electrocatalytic effect on the detection of folic acid. This electrochemical sensor showed a dynamic linear response range from 0.08 to 635.0 µM and the detection limit was estimated to be 0.03±0.001 µM. Moreover, the feasibility of Ni-BTC MOF/SPE sensor to detect folic acid in real samples was also evaluated by the standard addition method.

“…Due to the simple sample preparation, low-cost instrumentation, high sensitivity, selectivity, accuracy and precision of electrochemical methods, they have been used widely in biological and environmental analysis. However, many analytes exhibit irreversible oxidation requiring large overpotential at conventional electrodes [6][7][8][9][10]. Therefore, the use of chemically modified electrodes for the analysis of metals and organics is a well-established practice [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical sensor for determination of hydroxylamine using functionalized Fe3O4 nanoparticles and graphene oxide modified screen-printed electrode

Tashakkorian

Jahani

Aflatoonian

2021

A simple strategy for determination of hydroxylamine based on Fe3O4 nanoparticles functionnalized by [2-(4-((3-(trimethoxysilyl)propylthio)methyl)1-H1,2,3-triazol-1-yl)aceticacid] (FNPs) and graphene oxide (GO) modified screen-printed electrode (SPE), denoted as (Fe3O4 FNPs/GO/SPE), is reported. The electrochemical behavior of hydroxylamine was investigated at Fe3O4FNPs/GO/SPE by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CHA) techniques in phosphate buffer solution (pH 7.0). Fe3O4 FNPs/GO/SPE as a novel electrochemical sensor exhibited catalytic activity toward the oxidation of hydroxylamine. The potential of hydroxylamine oxidation was shifted to more negative potentials, and its oxidation peak current increased on the modified electrode, also indicating that under these conditions, the electrochemical process is irreversible. The electrocatalytic current of hydroxylamine showed a good relationship in the concentration range of 0.05–700.0 μM, with a detection limit of 10.0 nM. The proposed electrode was applied for the determination of hydroxylamine in water samples, too.