Multilayered iron oxide/reduced graphene oxide nanocomposite electrode for voltammetric sensing of bisphenol-A in lake water and thermal paper samples

Gross, Marcos A.; Moreira, S. G. C.; Pereira-da-Silva, Marcelo A.; Sodré, Fernando Fabriz; Paterno, Leonardo G.

doi:10.1016/j.scitotenv.2020.142985

Cited by 20 publications

(5 citation statements)

References 42 publications

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“…41 This is accompanied by a structureless tail moving toward lower wavelengths, which is assigned to the Fe(II) ↔ Fe(III) charge transfer in ION and the π → π* transition in RGO. 27 For comparison, this feature is also present in the spectrum of the B-10 film, as provided in Figure 2A. Figure 2B shows a SEM micrograph of the electrode, where a globular structure comprising both ION and AuNP embedded in a relatively amorphous matrix of RGO and PDAC is noted.…”

Section: Resultsmentioning

confidence: 79%

“…Thus, the UV–vis spectrum of the B-10/AuNP-10 is shown in Figure A, where a relatively broad band centered at 530 nm is observed, which is ascribed to the localized surface plasmon resonance in AuNP . This is accompanied by a structureless tail moving toward lower wavelengths, which is assigned to the Fe(II) ↔ Fe(III) charge transfer in ION and the π → π* transition in RGO . For comparison, this feature is also present in the spectrum of the B-10 film, as provided in Figure A.…”

Section: Resultsmentioning

confidence: 90%

“…An ammoniacal suspension of graphitic oxide was sonicated to produce the GO suspension, as described in a previous work . To prepare the ION-RGO nanocomposite, the in situ approach was employed, as detailed: 10 mL of an aqueous solution of FeSO 4 solution was added drop by drop to 200 mL of a GO suspension (0.1 g L –1 , pH 11) kept under mechanical stirring at room temperature (25 °C), resulting in a black precipitate after 30 min of reaction.…”

Section: Methodsmentioning

confidence: 99%

“…An ammoniacal suspension of graphitic oxide was sonicated to produce the GO suspension, as described in a previous work. 27 To prepare the ION-RGO nanocomposite, the in situ approach was employed, as detailed: 28 10 mL of an aqueous solution of FeSO 4 solution was added drop by drop to 200 mL of a GO suspension (0.1 g L −1 , pH 11) kept under mechanical stirring at room temperature (25 °C), resulting in a black precipitate after 30 min of reaction. The precipitate was separated by decantation aided by a Nd−Fe−B magnet and then washed three times with ultrapure water, with centrifugation steps (5000 rpm, 20 min) in between, in order to remove unreacted Fe(II), ammonium, and sulfate ions.…”

Section: Preparation Of Go and Ion-rgomentioning

confidence: 99%

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Iron Oxide, Reduced Graphene Oxide, and Electrodeposited Gold Nanoparticle-Based Electrodes for Nanomolar Detection of Nitrite in Food

Gross,

Paterno

2024

ACS Appl. Nano Mater.

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The nitrite ion (NO2 –) is used as a preservative of food and drink and has been widely used in the food industry. Nonetheless, it is a potential precursor of nitrosamines, which are known for their carcinogenic activity. Therefore, monitoring of nitrite in foods and drinks is of paramount importance for food safety. Herein, we report a very sensitive electroanalytical method for the determination of nitrite in food samples, capable of detecting nitrite at the nanomolar level. For that purpose, a nanocomposite electrode comprising a multilayered film of iron oxide nanoparticles and reduced graphene oxide (ION-RGO) was decorated with electrodeposited gold nanoparticles (AuNP) and operated by electrochemical impedance spectroscopy (EIS). It is observed a synergistic combination of the electrocatalytic activity of ION-RGO, the electrical conductivity of AuNP, and the interrogation of the electrode within the charge-transfer frequency range, which mitigates unwanted capacitive effects and enhances the nitrite electrooxidation. Consequently, nitrite has been detected within a wide linear range (r 2 > 0.999) of 0.58–3019 μM and with a limit of detection of 2.4 nM. Owing to the improved adhesion of AuNP to the ION-RGO framework, the electrode is highly stable and lasts for at least 30 consecutive runs without losing its sensitivity. Additionally, the proposed method enables the determination of nitrite in sausage and milk samples, when it performs identically to a reference method at the 95% confidence level.

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Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Preparation Of Go and Ion-rgomentioning

confidence: 99%

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Iron Oxide, Reduced Graphene Oxide, and Electrodeposited Gold Nanoparticle-Based Electrodes for Nanomolar Detection of Nitrite in Food

Gross,

Paterno

2024

ACS Appl. Nano Mater.

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“…In recent years, optical fiber devices have been widely explored in the literature for hydrostatic pressure [13], lateral load [14], and strain [15,16] sensing. They have, therefore, general application as optical sensing devices; however, thin graphene oxide (GO) [17][18][19][20][21] films have gained acceptance in the development of several devices [22][23][24][25][26][27][28][29][30][31] and sensors [32][33][34][35][36][37][38][39][40]. Recently, it has been demonstrated that hollow microsphere fiberbased sensors, conforming to Fabry-Perot interferometers (FPI), can be used in sensing applications [41] by using GO as a tunable platform to enhance the spectral features of hollow microsphere FPI fiber sensor devices.…”

Section: Introductionmentioning

confidence: 99%

Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability

et al. 2021

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Thin graphene oxide (GO) film layers are being widely used as sensing layers in different types of electrical and optical sensor devices. GO layers are particularly popular because of their tuned interface reflectivity. The stability of GO layers is fundamental for sensor device reliability, particularly in complex aqueous environments such as wastewater. In this work, the stability of GO layers in layer-by-layer (LbL) films of polyethyleneimine (PEI) and GO was investigated. The results led to the following conclusions: PEI/GO films grow linearly with the number of bilayers as long as the adsorption time is kept constant; the adsorption kinetics of a GO layer follow the behavior of the adsorption of polyelectrolytes; and the interaction associated with the growth of these films is of the ionic type since the desorption activation energy has a value of 119 ± 17 kJ/mol. Therefore, it is possible to conclude that PEI/GO films are suitable for application in optical fiber sensor devices; most importantly, an optical fiber-based interrogation setup can easily be adapted to investigate in situ desorption via a thermally stimulated process. In addition, it is possible to draw inferences about film stability in solution in a fast, reliable way when compared with the traditional ones.

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Core‐shell Hierarchical Enzymatic Biosensor Based on Hyaluronic Acid Capped Copper Ferrite Nanoparticles for Determination of Endocrine‐disrupting Bisphenol A

et al. 2021

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A novel enzymatic electrochemical biosensor (mCuF/PANI‐nf/HA/Lacc/GCE) was designed for detection of bisphenol A (BPA). The copper ferrite nanoparticles was obtained by co‐precipitation and its surface was modified with ‐NH2 functional organosilane. Polyaniline nanofibers were also synthesized by cyclic voltammetry and characterized by FTIR, XRD, TGA, SEM and TEM, respectively. Then, it was crosslinked with hyaluronic acid as an immobilization matrix for Laccase to adhere to surface of the modified copper ferrites. Cyclic and differential pulse voltammetries were used to evaluate the electrochemical performances of the biosensor, which has a LOD value of 5.40 nM and a LOQ value of 16.20 nM in the 0.01–7.50 μM linear working range. The biosensor was successfully applied for determination of BPA in seawater, canned water and milk samples with recoveries ranging from 96.0 % and 100.7 %. In addition, accuracy of the voltammetric determination method in the real samples was carried out by HPLC and spike/recovery test. The layer‐by‐layer surface modification strategy of the designed mCuF/PANI‐nf/HA/Lacc/GCE biosensor opens a new perspective on both BPA determination and using biopolymer in the structure of enzymatic electrochemical biosensors.

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Multilayered iron oxide/reduced graphene oxide nanocomposite electrode for voltammetric sensing of bisphenol-A in lake water and thermal paper samples

Cited by 20 publications

References 42 publications

Iron Oxide, Reduced Graphene Oxide, and Electrodeposited Gold Nanoparticle-Based Electrodes for Nanomolar Detection of Nitrite in Food

Iron Oxide, Reduced Graphene Oxide, and Electrodeposited Gold Nanoparticle-Based Electrodes for Nanomolar Detection of Nitrite in Food

Thermally Stimulated Desorption Optical Fiber-Based Interrogation System: An Analysis of Graphene Oxide Layers’ Stability

Core‐shell Hierarchical Enzymatic Biosensor Based on Hyaluronic Acid Capped Copper Ferrite Nanoparticles for Determination of Endocrine‐disrupting Bisphenol A

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