Semiconductor α‐Fe<sub>2</sub>O<sub>3</sub> Hematite Fabricated Electrode for Sensitive Detection of Phenolic Pollutants

Quantum dots (QDs) are semiconducting inorganic nanoparticles, tiny molecules of 2-10 nm sizes to strength the quantum confinements of electrons. The QDs are good enough to emit light onto electrons for exciting and returning to the ground state. Here, CdSe/ZnS core/shell QDs have been prepared and applied for electrochemical sensor development in this approach. Flat glassy carbon electrode (GCE) was coated with CdSe/ZnS QDs as very thin uniform layer to result of the selective and efficient sensor of 3-CP (3-chlorophenol). The significant analytical parameters were calculated from the calibration plot such as sensitivity (3.6392 µA µM −1 cm −2) and detection limit (26.09 ± 1.30 pM) with CdSe/ZnS/ GCE sensor probe by electrochemical approach. The calibration curve was fitted with the regression coefficient r 2 = 0.9906 in the range of 0.1 nM ∼ 0.1 mM concentration, which denoted as linear dynamic range (LDR). Besides these, it was performed the reproducibility in short response time and successfully validated the fabricated sensor for 3-CP in the real environmental and extracted samples. It is introduced as a noble route to detect the environmental phenolic contaminants using CdSe/ZnS QDs modified sensor by electrochemical method for the safety of healthcare and environmental fields at broad scales. Semiconductor quantum dots (QDs), in particular those of cadmium chalcogenides (CdS, CdSe, CdTe), have received steadily growing attention due to their high potential for various applications, such as sensing 1,2 , biological labeling 3-12 , light-emitting devices (LED) 13-17 , lasers 18,19 , and solar cells 20-22. Recently, the number of interest has been developed in the area of electrochemical sensors and biosensors in which CdSe are employed for the determination of clinical markers 23 and food 24 and environmental pollutants 25,26. CdSe have been using as electrochemical signal tracers to exploit the oxidation potentials of the metal ions forming them. This can also be attributed to some of the characteristics of CdSe, such as a large surface area-to-volume ratio, good interfacial properties with high surface reaction activity, high electron-transfer efficiency, excellent biocompatibility, and feasibility for surface modification 27-30. Moreover, metallic QDs also constitute a feasible option for electrochemical multiplexed assays due to their different stripping peak potentials 31,32. This is particularly true for the development of efficient, reliable, rapid, and cost-affordable analytical procedures for the determination of anthropogenic and natural substances of either organic or mineral nature that have toxic, persistent, and bio-accumulative properties. Due to the prevalent pollution of ground and surface water by chloro-organic chemicals such as chlorophenol derivatives, the public concern has been growing over the several few decades. Because, the chlorophenols (including 3-CP) have high toxicity and able to produce mutagenic, estrogenic and carcinogenic effects in human beings 33-36 and even unsafe for t...

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“…4(b). The similar electrochemical oxidation phenomena of 3-CP have been reported elsewhere 62,[78][79][80][81] .…”

Section: Detection Of 3-cp By Electrochemical Approach the Proposed supporting

confidence: 85%

Facile and efficient 3-chlorophenol sensor development based on photolumenescent core-shell CdSe/ZnS quantum dots

Rahman

Karim

Alam

et al. 2020

Sci Rep

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“…The interface among the Fe 2 O 3 nanoparticles, BT platelets and PVDF polymer matrix could promote the accumulation and migration of the charge carriers. Having in mind the semiconducting nature of the Fe 2 O 3 nanoparticles, 43 they possess much higher conductivity than the BT or PVDF‐HFP polymer matrix 44 . The difference in conductivities could induce more space charge polarization at the interface 45 .…”

Section: Resultsmentioning

confidence: 99%

Effect of the filler morphology on the crystallization behavior and dielectric properties of the polyvinylidene fluoride‐based composite

Filipović,

Obradović,

Corlett

et al. 2023

J of Applied Polymer Sci

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Ceramic/polymer composites can be chemically stable, mechanically strong, and flexible, which make them candidates for electric devices, such as pressure or temperature sensors, energy storage or harvesting devices, actuators, and so forth. Depending on the application, various electrical properties are of importance. Polymers usually have low dielectric permittivity, but increased dielectric permittivity can be achieved by the addition of the ceramic fillers with high dielectric constant. With the aim to enhance dielectric properties of the composite without loss of flexibility, 5 wt% of BaTiO3‐Fe2O3 powder was added into a polyvinylidene fluoride matrix. The powder was prepared by different synthesis conditions to produce core/shell structures. The effect of the phase composition and morphology of the BaTiO3‐Fe2O3 core/shell filler on the structure and lattice dynamics of the polymer composites was investigated. Based on the results of the thermal analysis, various parameters of ceramic/polymer composites were determined. Differences in the phase composition and morphology of the filler have an influence on the formation of various polyvinylidene fluoride allomorphs and the degree of crystallinity. Furthermore, the dielectric performances of pure polyvinylidene fluoride and the polymer/ceramic composites were measured.

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“…The creation of sensors with very low detection limits for specific materials has been prompted by the desire for tools that enable early detection in groundwater, seas, rivers, or soils. contaminants is a field of study that is gaining more and more attention [4]. Numerous industries, including photocatalysis, agriculture, dye-sensitized solar cells and medicinal devices, use nano-TiO 2 photo semiconductors [5].The application of TiO 2 nanoparticles in agriculture, however, is still relatively new and needs more research.…”

Section: -Introductionmentioning

confidence: 99%

Synthesis and characterization of α-Fe2O3 Nanoparticles and α-Fe2O3 /TiO2 Nanocomposite and application them in a solar cell

Abd,

Amer Musa Juda

2023

J. K. Chem. Sci.

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Abstract: Nanostructures of metal oxides of TiO2 and α-Fe2O3 are prepared through the hydrothermal method. Also α-Fe2O3/TiO2nanocomposites are prepared by the hydrothermal technique using an and α-Fe2O3 /TiO2 nanocomposites are mixed in the equal ratio. The properties of the prepared compounds are investigated through Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD). The optical properties of prepared compounds are studied through UV-Vis Spectroscopy, X-ray diffraction patterns of prepared TiO2, and α-Fe2O3 have shown a( monoclinic structure, Tetragonal, and Hexagonal ) respectively. The optical band gap is (3.0, 1.6 and 2.7) eV for TiO2, α-Fe2O3 NPs and CuO/TiO2/α-Fe2O3nanocomposites. Dye-sensitized solar cells (DSSCs) fabricated based on TiO2, α-Fe2O3 NPs and α-Fe2O3 /TiO2/ nanocomposites are casted onto (FTO) substrates (front electrode). while the back electrode is a carbon/FTO-glass substrate. Two natural dyes of dyes are used green leek dye and red pomegranate dye whereas iodine/ iodide (KI/I2) is used as the electrolyte solution.. The solar cells efficiency rates (0.65, 1.38 and 0.96) for TiO2, α-Fe2O3 Nps and α-Fe2O3 /TiO2/ nanocomposites/re d pomegranate dye respectively. and The solar cells' efficiency rates are (0.69, 1.93 and1.29) for TiO2, and α-Fe2O3 /TiO2/ nanocomposites/ green leek dye respectively

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Semiconductor α‐Fe₂O₃ Hematite Fabricated Electrode for Sensitive Detection of Phenolic Pollutants

Cited by 6 publications

References 35 publications

Facile and efficient 3-chlorophenol sensor development based on photolumenescent core-shell CdSe/ZnS quantum dots

Facile and efficient 3-chlorophenol sensor development based on photolumenescent core-shell CdSe/ZnS quantum dots

Effect of the filler morphology on the crystallization behavior and dielectric properties of the polyvinylidene fluoride‐based composite

Synthesis and characterization of α-Fe2O3 Nanoparticles and α-Fe2O3 /TiO2 Nanocomposite and application them in a solar cell

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Semiconductor α‐Fe2O3 Hematite Fabricated Electrode for Sensitive Detection of Phenolic Pollutants

Cited by 6 publications

References 35 publications

Facile and efficient 3-chlorophenol sensor development based on photolumenescent core-shell CdSe/ZnS quantum dots

Facile and efficient 3-chlorophenol sensor development based on photolumenescent core-shell CdSe/ZnS quantum dots

Effect of the filler morphology on the crystallization behavior and dielectric properties of the polyvinylidene fluoride‐based composite

Synthesis and characterization of α-Fe2O3 Nanoparticles and α-Fe2O3 /TiO2 Nanocomposite and application them in a solar cell

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Semiconductor α‐Fe₂O₃ Hematite Fabricated Electrode for Sensitive Detection of Phenolic Pollutants