尽管利用外部磁场(MF)在许多不同的应用中促进磁性纳米材料固有的独特特征,然而,在传感器应用中,MF依赖性电化学行为的起源以及电极上分析物的电化学响应仍不清楚。在这份报告中,MF对电解质物理化学性质的影响(极化,大众运输,电荷/电子转移)和电极的性质(电导率,形态学,表面积,互动,吸附能力,电催化能力)进行了彻底的研究。在这里,工作电极表面用碳球(CS)改性,磁性纳米粒子(Fe3O4NPs),和它们的纳米复合材料(Fe3O4@CSs),分别。然后,它们被直接用于增强氯霉素(CAP)的电化学特性和响应能力。更有趣的是,在裸电极和修饰电极上计算了一系列与K3[Fe(CN)6]/K4[Fe(CN)6)]的扩散控制过程和CAP的吸附控制过程有关的动力学参数。有和没有MF的存在。这些参数不仅显示了用所提出的材料修饰电极表面的关键作用,而且还显示了外部MF存在的积极影响。此外,提出并详细讨论了增强的机制和假设,进一步证明了将Fe3O4@CS纳米复合材料与MF助剂用于先进能源的发展潜力,环境,和传感器相关的应用。
Despite the utilization of external magnetic field (MF) in promoting the intrinsic unique features of magnetic nanomaterials in many different applications has been reported, however the origin of MF-dependent electrochemical behaviors as well as the electrochemical response of analytes at the electrode in sensor applications is still not clear. In this report, the influence of MF on the electrolyte\'s physicochemical properties (polarization, mass transport, charge/electron transfer) and electrode\'s properties (conductivity, morphology, surface area, interaction, adsorption capability, electrocatalytic ability) was thoroughly investigated. Herein, the working electrode surface was modified with carbon spheres (CSs), magnetic nanoparticles (Fe3O4NPs), and their nanocomposites (Fe3O4@CSs), respectively. Then, they were directly used to enhance the electrochemical characteristics and response-ability of chloramphenicol (CAP). More interestingly, a series of various kinetic parameters related to the diffusion-controlled process of K3[Fe(CN)6]/K4[Fe(CN)6)] and the adsorption-controlled process of CAP were calculated at the bare electrode and the modified electrodes with and without the presence of MF. These parameters not only exhibit the crucial role of the modification of electrode surface with the proposed materials but also show positive impacts of the presence of external MF. Besides, the mechanism and hypothesis for the enhancements were proposed and discussed in detail, further demonstrating the development potential of using Fe3O4@CS nanocomposites with MF assistant for advanced energy, environmental, and sensor related-applications.