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Abstract：
Background Electrochemical sensing is a versatile field that uses electrochemistry concepts to detect and measure various substances. It finds applications in clinical diagnostics and environmental monitoring. Scientists are currently working on creating reliable electrochemical sensing devices that can accurately detect ascorbic acid. Iron sulfide (FeS) has emerged as a promising material for these sensors due to its excellent electrical conductivity, catalytic activity, and stability. Materials and methods The FeS nanoparticles were synthesized through the hydrothermal method of synthesis. The glassy carbon electrode (GCE) with a surface area of 0.071 cm2 was modified with FeS before the working electrode was mechanically polished with 1 µm, 0.3 µm, and 0.05 µm alumina pastes for mirror finishing. Then it was subjected to ultrasonication in double distilled water for a few minutes to clean the surface of GCE. The FeS suspension was prepared by dispersing 5 mg of FeS in 10 mL of ethanol during 20 minutes of ultrasonic agitation then the GCE was coated with 10 μL of the suspension by drop coating method and dried in air. Results In this study, FeS nanoparticles were synthesized by the hydrothermal method of synthesis, and it was tested for their electrochemical sensing properties by various tests. Based on the field emission-scanning electron microscope (FE-SEM) analysis, scan rate effect test, cyclic voltammetric test, X-ray diffraction (XRD), and energy-dispersive X-ray (EDX) spectroscopy analysis done and results obtained, it was seen that the synthesized FeS nanoparticles are highly pure and have a crystalline structure. FeS has an even morphology. The synthesized particles also showed highly sensitive and specific sensing toward ascorbic acid when compared to unmodified 10.1 µA electrodes with a sensing value of 12.51 μA, thereby fulfilling the aim of this study. Conclusion Based on the outcomes of the diverse tests carried out, it is evident that the sample displayed a high crystalline nature as indicated by the XRD test. Additionally, the sample exhibited a uniform morphology, exceptional stability, and remarkable sensitivity. The developed FeS-based electrochemical sensor was found to be exceptionally pure and showed excellent performance, showcasing both high sensitivity and selectivity toward ascorbic acid.
摘要：
背景技术电化学感测是使用电化学概念来检测和测量各种物质的通用领域。它在临床诊断和环境监测中得到应用。科学家们目前正在致力于创造可靠的电化学传感设备，可以准确地检测抗坏血酸。硫化铁（FeS）由于其优异的导电性，已成为这些传感器的有前途的材料，催化活性，和稳定性。材料和方法通过水热法合成FeS纳米颗粒。表面积为0.071cm2的玻碳电极（GCE）用FeS改性，然后将工作电极用1μm机械抛光，0.3µm,和0.05µm氧化铝浆料，用于镜面加工。然后将其在双蒸水中进行超声处理几分钟以清洁GCE的表面。通过在20分钟的超声搅拌期间将5mgFeS分散在10mL乙醇中,然后通过滴涂方法用10μL悬浮液涂覆GCE并在空气中干燥来制备FeS悬浮液。结果在这项研究中，通过水热法合成FeS纳米粒子,并通过各种测试对其电化学传感性能进行了测试。基于场发射扫描电子显微镜(FE-SEM)分析,扫描速率效应测试,循环伏安试验,X射线衍射(XRD)和能量色散X射线（EDX）光谱分析并获得结果，可以看出,合成的FeS纳米颗粒是高纯度的并且具有晶体结构。FeS具有均匀的形态。与未修饰的10.1µA电极（传感值为12.51μA）相比，合成的颗粒对抗坏血酸也表现出高灵敏度和特异性的传感，从而实现了本研究的目的。结论根据所进行的各种测试的结果，显然,样品显示出高结晶性质,如XRD测试所示。此外,样品表现出均匀的形态，异常稳定，和非凡的敏感性。发现开发的基于FeS的电化学传感器非常纯净，并显示出优异的性能，展示了对抗坏血酸的高灵敏度和选择性。
