An alternative electrochemical approach for toluene detection with ZnO/MgO/Cr<sub>2</sub>O<sub>3</sub> nanofibers on a glassy carbon electrode for environmental monitoring

Alam, M. M.; Asiri, Abdullah M.; Uddin, M. T.; Rahman, Mohammed M.; Islam, M. A.

doi:10.1039/d0ra08577d

Cited by 14 publications

(4 citation statements)

References 58 publications

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“…The X-ray diffraction analysis of NSs confirms the existence of CuO and ZnO, which is completely in agreement with the results obtained from the FESEM and EDS analyses. As shown in Figure 4a, the Zn2p orbital is divided into the Zn2p 3/2 and Zn2p 1/2 spin orbitals located around 1022 and 1045 eV and having the spin separation of 23 eV, a characteristic value for 2+ oxidation of Zn in the prepared CuO/ZnO NSs and identified by previous articles on ZnO [35][36][37][38]. Figure 4b presents a peak at 531 eV, indicating an O 2− ion associated with the Cu-O and Zn-O bonds in the CuO/ZnO NSs [39,40].…”

Section: Xrd Analysis Of Cuo/zno Nssmentioning

confidence: 93%

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

et al. 2021

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In this research study, we developed a voltammetric electrochemical sensor probe with a copolymer Nafion (Sulfonated Tetrafluoroethylene-based Fluoro-polymer) decorated with hydrothermally prepared sandwich-type CuO/ZnO nanospikes (NSs) onto a glassy carbon electrode (GCE) for reliable thiourea (TU) detection. The detailed characterizations in terms of structural morphology, binding energy, elemental compositions, grain size and crystallinity for synthesized NSs were performed by field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis, respectively. The differential pulse voltammetric (DPV) analysis for TU showed good linearity at current-versus-TU concentration on the calibration plot in the 0.15~1.20 mM range, which is defined as a dynamic detection range (LDR) of TU in a phosphate buffer solution. Considering the slope of LDR over the GCE-coated NSs surface area (0.0316 cm2), the TU sensor sensitivity (0.4122 µA µM−1 cm−2) was obtained. Besides this, the low limit (LOD) for TU detection was calculated and found to be 23.03 ± 1.15 µM. The fabricated Nafion/CuO/ZnO NSs/GCE sensor probe was created as a reliable sensor based on reproducibility, interference effect, stability and response time. Real bio-samples were investigated and the results confirm the anticipated reliability of the TU sensor probe. Thus, this is a noble way to develop enzyme-free electrochemical sensors that could be an alternative approach for the detection of chemicals in the field of enzyme-free biosensor development technology.

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Section: Xrd Analysis Of Cuo/zno Nssmentioning

confidence: 93%

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

et al. 2021

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“…The metal oxides belong to semiconductor group are performed as the most potential electrons sensing substrate to the development of an electrochemical sensor for analyzing various chemicals and biochemical. Therefore, CuO/Mn 2 O 3 /NiO, [20] ZnO/MgO/Cr 2 O 3 nanofiber (NF), [21] and RuO 2 /ZnO/TiO 2 nanocomposites [22] are the ternary combination of semi‐conductive metal oxides and reported as reliable sensing substrates in the development of electrochemical sensors. ZnO is widely used semi‐conductor and fascinated to researchers due to its promising electrochemical properties, non‐toxic in nature, good stability with amazing photo‐sensitivity, excellent electron communication capacity.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Melamine in Different Water Samples with ZnO‐doped Co₃O₄Nanoparticles on a Glassy Carbon Electrode by Differential Pulse Voltammetry

Rahman

Alam

Asiri

et al. 2021

Chemistry An Asian Journal

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In this investigation, a melamine electrochemical sensor has been developed by using wet‐chemically synthesized low‐dimensional aggregated nanoparticles (NPs) of ZnO‐doped Co3O4 as sensing substrate that were decorated onto flat glassy carbon electrode (GCE). The characterization of NPs such as UV‐Vis, FTIR, XRD, XPS, EDS, and FESEM was done for detailed investigations in optical, functional, structural, elemental, and morphological analyses. The ZnO‐doped Co3O4 NPs decorated GCE was used as a sensing probe to analyze the target chemical melamine in a phosphate buffer at pH 5.7 by applying differential pulse voltammetry (DPV). It exhibited good performances in terms of sensor analytical parameters such as large linear dynamic range (LDR; 0.15–1.35 mM) of melamine detection, high sensitivity (80.6 μA mM−1 cm−2), low limit of detection (LOD; 0.118±0.005 mM), low limit of quantification (LOQ; 0.393 mM), and fast response time (30 s). Besides this, the good reproducibility (in several hours) and repeatability were investigated under identical conditions. Moreover, it was implemented to measure the long‐time stability, electron mobility, less charge‐transfer resistance, and analyzed diffusion‐controlled process for the oxidation reaction of the NPs assembled working GCE electrode, which showed outstanding chemical sensor performances. For validation, real environmental samples were collected from various water sources and investigated successfully with regard to the reliability of the selective melamine detection with prepared NPs coated sensor probe. Therefore, this approach might be introduced as an alternative route in the sensor technology to detect selectively unsafe chemicals by an electrochemical method with nanostructure‐doped materials for the safety of environmental, ecological, healthcare fields in a broad scale.

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“…PEC sensing of xylene and toluene was mostly applied for gas phase samples, where high temperatures were required. Only a few studies report the electrochemical (i.e., not light-assisted) detection of xylene and toluene in aqueous phase using a boron-doped diamond or glassy carbon-supported ZnO/MgO/Cr 2 O 3 nanofiber anodes, respectively [56,57]. The reported LODs for detection of xylene and toluene were 0.0954 mg L −1 and 0.0736 mg L −1 , respectively.…”

Section: Pec Detection Of Xylene With Wo 3 and Bivo 4 Photoanodesmentioning

confidence: 99%

Investigation of WO3 and BiVO4 Photoanodes for Photoelectrochemical Sensing of Xylene, Toluene and Methanol

Petruleviciene,

Savickaja,

Juodkazyte

et al. 2023

Chemosensors

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Volatile organic compounds (VOCs) are a notable group of indoor air pollutants released by household products. These substances are commonly employed as solvents in industrial operations, and some of them are recognized or suspected to be cancer-causing or mutagenic agents. Due to their high volatility, VOCs are typically present in surface waters at concentrations below a few micrograms per liter. However, in groundwater, their concentrations can reach levels up to thousands of times higher. This study analyses the applicability of the photoelectrochemical (PEC) sensing of VOCs in aqueous medium. Tungsten oxide and bismuth vanadate photoanodes were tested for PEC sensing of xylene, toluene, and methanol in sodium chloride and sodium sulfate electrolytes. The crystalline structure and morphology of coatings were analyzed using XRD and SEM analyses. Photoelectrochemical properties were evaluated using cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy. The results of the study show that aromatic compounds tend to block the surface of the photoelectrode and interfere with the PEC sensing of other substances. WO3 photoanode is found to be suitable for the PEC sensing of methanol under the mild conditions in aqueous electrolytes; however, electrode engineering and assay optimization are required to achieve better detection limits.

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An alternative electrochemical approach for toluene detection with ZnO/MgO/Cr₂O₃ nanofibers on a glassy carbon electrode for environmental monitoring

Abstract: In situ fabrication of a sensitive electrochemical toluene sensor probe using wet-chemically prepared ternary ZnO/MgO/Cr2O3 nanofiber (NF)-decorated glassy carbon electrode (GCE) with Nafion adhesive was the approach of this study.

Cited by 14 publications

References 58 publications

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

Assessment of Melamine in Different Water Samples with ZnO‐doped Co₃O₄Nanoparticles on a Glassy Carbon Electrode by Differential Pulse Voltammetry

Investigation of WO3 and BiVO4 Photoanodes for Photoelectrochemical Sensing of Xylene, Toluene and Methanol

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An alternative electrochemical approach for toluene detection with ZnO/MgO/Cr2O3 nanofibers on a glassy carbon electrode for environmental monitoring

Abstract: In situ fabrication of a sensitive electrochemical toluene sensor probe using wet-chemically prepared ternary ZnO/MgO/Cr2O3 nanofiber (NF)-decorated glassy carbon electrode (GCE) with Nafion adhesive was the approach of this study.

Cited by 14 publications

References 58 publications

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes

Assessment of Melamine in Different Water Samples with ZnO‐doped Co3O4Nanoparticles on a Glassy Carbon Electrode by Differential Pulse Voltammetry

Investigation of WO3 and BiVO4 Photoanodes for Photoelectrochemical Sensing of Xylene, Toluene and Methanol

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An alternative electrochemical approach for toluene detection with ZnO/MgO/Cr₂O₃ nanofibers on a glassy carbon electrode for environmental monitoring

Assessment of Melamine in Different Water Samples with ZnO‐doped Co₃O₄Nanoparticles on a Glassy Carbon Electrode by Differential Pulse Voltammetry