Herein, a fast and sensitive electrochemical sensor was developed for imidacloprid detection using low-cost disposable microporous carbon screen-printed electrodes.
Electrode fouling has been a major problem in the analysis of phenolic compounds. This work synthesized carbon nanofiber (CNF) by electrospinning and demonstrated the anti-fouling properties of the material. The synthesized CNF was characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, infrared spectroscopy, electrochemical impedance spectroscopy, and cyclic voltammetry. Three electrode preparation methods were then tested including as-spun sheet, screen printing and dropcasting. The electrochemical behaviors of CNF towards a wide range of systems were demonstrated, including reversible redox processes [e.g. K4Fe(CN)6 and catechol], the deposition and stripping of metal ions [e.g. Ag(I) and Cu(II)], and irreversible redox processes [e.g. resorcinol and bisphenol-A]. To highlight the advantages of the anti-fouling properties of CNF, we then used resorcinol which is an environmental contaminant as a model system and explored the analytical performances of CNF electrodes. The linear range of resorcinol detection was 10–250 μM. The sensitivity and limit of detection (3sB m−1) were determined to be 0.021 μA μM−1 and 7.27 μM, respectively.
Silver microelectrode arrays are fabricated by photolithography for a one‐step analysis of H2O2 in low ionic strength samples. The effects of electrode length, width, band‐to‐band separation, connection height, and adhesion layer are evaluated. The developed sensor shows excellent repeatability (RSD=1.20 % (n=5)) and reproducibility (RSD=1.12 % (n=5)) with the linear range of 0.0–10.0 mM, the sensitivity of 9.84±0.34 μA mM−1, and the detection limit of 22.69 μM. The sensor has been successfully applied to detect H2O2 directly without the addition of supporting electrolyte in synthetic urine, tap water, drinking water, and milk samples.
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