Bimetallic Mn/Fe MOF modified screen-printed electrodes for non-enzymatic electrochemical sensing of organophosphate

Janjani, Prachi; Bhardwaj, Upasana; Kushwaha, H.S.

doi:10.1016/j.aca.2022.339676

Cited by 65 publications

(30 citation statements)

References 49 publications

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“…Additionally, both anodic and cathodic peak currents increased significantly, and sharp peaks were observed for RGO/SPE compared with the bare SPE, suggesting a higher electrocatalytic activity for the modified electrode. Moreover, the Randles Ševčík equation was applied to estimate the active surface area of the electrode. I = 2.687 × 10 5 n 3 / 2 A D 1 / 2 ν 1 / 2 C In eq , I is the peak current (A), n is the number of electrons exchanged in redox ( n = 1), A is the active surface area of electrode (cm 2 ), D is the diffusion coefficient (7.2 × 10 –6 cm 2 s –1 ), ν is the scan rate (V s –1 ), and C is the concentration (mol cm –3 ). , The cyclic voltammograms for the bare SPE and RGO/SPE at varying sweeping rates are plotted in Figure . The surface areas of the electrodes, thus, calculated were 0.07 cm 2 and 0.16 cm 2 for bare SPE and RGO/SPE, respectively.…”

Section: Resultsmentioning

confidence: 99%

A Non-Enzymatic Electrochemical Sensor for Glyphosate Adopting Surface Modified Screen-Printed Electrodes

Janjani

Bhardwaj

Kushwaha

2023

ACS Appl. Eng. Mater.

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In this study, a lab-on-chip electrochemical sensor was developed for ultratrace determination of glyphosate. A singlestep approach was adopted for the surface modification of screenprinted electrodes using reduced graphene oxide. Cyclic voltammetry and electrochemical impedance spectroscopy were employed to characterize the electrochemical behavior of the modified electrode. The modified electrode exhibited lowered electron transfer resistance, improved current response, and demonstrated selectivity and sensitivity toward glyphosate. Differential pulse voltammetry was employed to quantify glyphosate. The detection limit for glyphosate was achieved up to 0.144 nmol L −1 for a wide concentration range of 1 to 1000 nM. The proposed sensor presents the advantage of nonenzymatically and specifically determining glyphosate and offers exceptional stability with a relative standard deviation of 3.3% for 10 days. Finally, the applicability of the developed technique was assessed by quantification of glyphosate in tap water and garden soil samples. The ease of fabrication and implementation of the proposed sensor can contribute to the quest for on-site determination of the ecological contaminants.

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Section: Resultsmentioning

confidence: 99%

A Non-Enzymatic Electrochemical Sensor for Glyphosate Adopting Surface Modified Screen-Printed Electrodes

Janjani

Bhardwaj

Kushwaha

2023

ACS Appl. Eng. Mater.

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“…The sensor showed electroreduction of the pyridine moiety in CHL with a LOD of 0.29 ppb. 17 Recently, the performance of manganese cobaltite (MnCo 2 O 4 )-decorated reduced graphene oxide−graphitic carbon nitride (rGO/g-C 3 N 4 ) toward CHL was investigated. The improved charge transferability and surface area of the nanocomposite facilitated the electrochemical sensing of CHL.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Chlorpyrifos Residues in Water under Thermodynamically Favorable Electrodics Using the f-MWCNT/N-(2-C₂H₅O) ED(CH₃COONa)₃ Composite of Superior Selectivity

Suresh

Nesakumar

Jegadeesan

et al. 2023

J. Agric. Food Chem.

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Researchers are continually seeking potential alternatives to develop water quality sensors with higher selectivity to obtain the desired performance during real-time deployment. Quantification technologies involving interface materials of distinguishing capacity at elevated matrix complexity are desirable. However, there remains a challenge in designing suitable techniques, methodologies, and appropriate validations to support the grounds for the selection of interface materials of enhanced selectivity. The ability to monitor chlorpyrifos in analytical and commercial grade compounds and in the water matrix using an interface material of suitable states is the focus of this work. Herein, N-(2-hydroxyethyl) ethylenediamine triacetic acid trisodium (N-(2-C2H5O) ED(CH3COONa)3) incorporated with functionalized multiwalled carbon nanotube (f-MWCNT) is reported to provide thermodynamically favorable charge transfer for the quantification of chlorpyrifos residues under varying internal and external conditions with appropriate validations using density functional theory (DFT) and high-performance liquid chromatography (HPLC). The sensor exhibited excellent figures of merit such as limit of detection (LOD) and limit of quantitation (LOQ) of 9.7 pM and 29.4 pM, respectively.

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“…Further, the sample volume required for an SPE is as low as 50 μL. Additionally, the surface of the SPEs' working electrode may be readily modified to improve the sensibility, lowering the detection limit, and increasing the selectivity of the electrochemical methods [15,16]. The chemical modification of inert substrate electrodes offers significant advantages in the design and development of electrochemical sensors [17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

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

J. Electrochem. Sci. Eng.

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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.

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Bimetallic Mn/Fe MOF modified screen-printed electrodes for non-enzymatic electrochemical sensing of organophosphate

Cited by 65 publications

References 49 publications

A Non-Enzymatic Electrochemical Sensor for Glyphosate Adopting Surface Modified Screen-Printed Electrodes

A Non-Enzymatic Electrochemical Sensor for Glyphosate Adopting Surface Modified Screen-Printed Electrodes

Quantification of Chlorpyrifos Residues in Water under Thermodynamically Favorable Electrodics Using the f-MWCNT/N-(2-C₂H₅O) ED(CH₃COONa)₃ Composite of Superior Selectivity

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

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Bimetallic Mn/Fe MOF modified screen-printed electrodes for non-enzymatic electrochemical sensing of organophosphate

Cited by 65 publications

References 49 publications

A Non-Enzymatic Electrochemical Sensor for Glyphosate Adopting Surface Modified Screen-Printed Electrodes

A Non-Enzymatic Electrochemical Sensor for Glyphosate Adopting Surface Modified Screen-Printed Electrodes

Quantification of Chlorpyrifos Residues in Water under Thermodynamically Favorable Electrodics Using the f-MWCNT/N-(2-C2H5O) ED(CH3COONa)3 Composite of Superior Selectivity

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

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Product

Resources

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Quantification of Chlorpyrifos Residues in Water under Thermodynamically Favorable Electrodics Using the f-MWCNT/N-(2-C₂H₅O) ED(CH₃COONa)₃ Composite of Superior Selectivity