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Semiconductor α-Fe <sub/>2</sub> O <sub/>3</sub> Hematite Fabricated Electrode for Sensitive Detection of Phenolic Pollutants
摘要： Hematite (α-Fe2O3) semiconductor is an abundant and non-toxic catalyst for different (photo)electrochemical reactions. In this work, a selective p-nitrophenol sensor was developed by fabricating a thin-layer of a glassy carbon electrode (GCE) with 5% nafion coating binders onto α-Fe2O3 thin film synthesized by a simple and inexpensive process. High sensitivity including long-term stability, and enhanced linear dynamic range, electrochemical performance towards p-nitrophenol were achieved by a reliable current-voltage method. A linear calibration curve was observed over a wide range of p-nitrophenol concentrations. Very low detection limit (0.6 ? 0.02 nM), good limit of quantification (2.0 nM) and high sensor sensitivity (K = 74.1 μA?cm(cid:0) 2) are calculated based on noise to signal ratio of ～ 3 N/S. Very importantly, the detection range covers over 7 orders of magnitude concentrations, from nM to mM. Figures of merits are comparable with best reported results whilst using a very simple device configuration. We show that hematite is an excellent material for the development of chemical sensors to detect hazardous compounds for environmental safety in a broad scale of concentrations.
关键词： Environmental safety,Sensitivity,p-Nitrophenol sensor,Hematite α-Fe2O3,Glassy carbon electrode
更新于2025-09-23 15:21:01
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Facile and efficient 3-chlorophenol sensor development based on photolumenescent core-shell CdSe/ZnS quantum dots
摘要： 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 co-efficient r2 = 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.
关键词： CdSe/ZnS,Quantum dots,electrochemical sensor,3-chlorophenol,environmental safety
更新于2025-09-16 10:30:52
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Nanocomposites-based nitrated polyethersulfone and doped ZnYNiO for selective As <sup>3+</sup> sensor application
摘要： The contamination of arsenic (As3+) cation in drinking water is one of the most well-known sources for human arsenic poison. Due to its high toxicity to human, there is a need to develop an efficient and low-cost method to detect it in aquatic environment. A sensor of nitrated polyethersulfone (PES-NO2) doped with ZnYNiO nanocomposites was successfully fabricated. PES-NO2 was synthesized in this study using H2SO4: HNO3 while ZnYNiO nanoparticles were fabricated using wet-chemical technique under low temperature and basic condition. The results of Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) analysis did confirm the interactions between the doped nanoparticles and nitro functions grafted on PES backbone. The developed polymeric nanocomposite (PES-NO2-ZnYNiO) was then used as a superb coating sensor for As3+. The working electrode of desire heavy metal ion sensor was fabricated by glassy carbon electrode (GCE) coated with PES-NO2-ZnYNiO nanocomposites as layer of thin film. To estimate the cationic sensor performances, a calibration curve obtained from current versus electrolyte (selective As3+ ion) concentration relation was plotted. The linearity of calibration curve is found over the linear dynamic range (LDR) of 0.1 nM~0.1 mM. The slope of calibration curve is used to measure the sensitivity and detection limit (DL) of As3+ cation sensor, and these are 9.8101 μA μM?1 cm?2 and 96.77 ± 4.84 pM, respectively. Therefore, the As3+ ion sensor is found as selective with good sensitivity, reproducible with high accuracy, validated in real environmental samples, long-term stability in aqueous medium, and highly active with short response time.
关键词： arsenic sensor,sensitivity,characterization,electrochemical method,synthesis,ZnYNiO,environmental safety,nitrated polyethersulfone
更新于2025-09-10 09:29:36