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One-step electrosynthesized molecularly imprinted polymer on laser scribed graphene bisphenol a sensor
摘要： Bisphenol A (BPA) is a toxic chemical used by industries for production of containers for storage of food and beverages leading to possible health risks. In this work, we present a simple, mask-free, low-cost imprinted sensor based on laser scribed graphene (LSG) technology combined to molecularly imprinted polymers (MIPs) for BPA determination. CO2 laser was used in production of LSG electrodes with high resistivity 58 Ω/square on flexible polyimide sheet leading to the high active surface area of the sensor. LSG device was functionalized with imprinted polypyrrole with a known amount of BPA as template molecule to develop the sensor. The bare LSG, LSG-MIP, LSG-NIP sensors were characterized using Raman spectroscopy, SEM, XRD, AFM. The electrochemical measurements were carried out using cyclic voltammetry and differential pulse voltammetry. Experimental conditions were optimized, including the concentration of pyrrole monomer, the number of polymerization cycles, the concentration of BPA as template and the incubation time. We evaluated the sensitivity of the LSG-MIP sensor in the concentration range between 0.05 μM and 20 μM with a limit of detection of 8 nM. The proposed sensor exhibits high selectivity towards BPA compared to its structural analogs and good reusability. The developed sensor was successfully applied for the detection of BPA in tap, mineral water and in plastic samples. The developed sensor was integrated into a PMMA case connected to the potentiostat to achieve complete isolation and a practical measurement system.
关键词： Molecularly imprinted polymers,Water samples,Electropolymerization,Electrochemical devices,Bisphenol A,Laser scribed graphene
更新于2025-09-23 15:21:01
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Performance improvement of yellow emitting electrochemiluminescence devices: Effects of frequency control and coreactant pathway
摘要： In this work, we propose an electrochemiluminescence (ECL) luminophore, 2,2′-bipyridylbis(2-phenylpyridine) iridium(III) hexafluorophosphate ([Ir(ppy)2(bpy)][PF6]) (1), emitting yellow-colored light for displaying a variety of ECL colors. The synthesized luminophore 1 is optically and electrochemically analyzed. The ECL electrolytes are very simply composed of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMI][TFSI]), sandwiched between two transparent electrodes used for the devices. The resulting ECL devices are characterized by a low-voltage operation and quick response independent of frequency. We also suggest an efficient method for improving the ECL brightness by incorporating 2,2′-bipyridylbis[2-(2′,4′-difluorophenyl) pyridine]iridium(III) hexafluorophosphate ([Ir(diFppy)2(bpy)][PF6]) (2) as a coreactant. The intensity of the emitted yellow light is doubled, when 60 mol% of 2 is included in the mixed-luminophore system. Additionally, we further enhanced the luminance of yellow light emitting ECL devices by adjusting the frequency of applied AC voltage, leading to ～3.5 times higher brightness at 500 Hz.
关键词： Luminophore,Electrochemical devices,Electrochemiluminesence,Brightness enhancement
更新于2025-09-23 15:19:57