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碳纳米管/锂铁氧体纳米复合材料：用于增强羟基自由基传感的磁性能和电化学性能优化

Carbon nanotubes/lithium ferrite nanocomposites: magnetic and electrochemical optimization for enhanced HO sensing.

作者信息

Ouda Emtinan, Yousf Nehad, Elzwawy Amir, Magar Hend S, Hassan Rabeay Y A, El-Ashry Magdy, Duraia El-Shazly M

机构信息

Physics Department, Faculty of Science, Suez Canal University Ismailia 41522 Egypt.

Laboratories Manager, Faculty of Medicine, Suez Canal University Ismailia 41522 Egypt.

出版信息

RSC Adv. 2025 Sep 15;15(40):33667-33681. doi: 10.1039/d5ra04502a. eCollection 2025 Sep 11.

DOI:10.1039/d5ra04502a
PMID:40959309
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC12435571/
Abstract

Hydrogen peroxide (HO) is a ubiquitous molecule in biological systems, but at elevated concentrations, it exhibits cytotoxicity, necessitating precise monitoring for both biomedical and analytical applications. In this work, we report a cost-effective strategy for synthesizing carbon nanotube/lithium ferrite (CNTs/LFO) nanocomposites with different LFO doping levels (0.5%, 1%, and 2%) for non-enzymatic HO sensing. The nanocomposites were fabricated a citrate-gel auto-combustion route, yielding uniformly dispersed structures. X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) confirmed the presence of a crystalline ferrite phase with nanoplate particles averaging ∼50 nm. Vibrating sample magnetometry (VSM) revealed a maximum saturation magnetization of 25 emu g for the 2% LFO composition. Electrochemical characterization using cyclic voltammetry (CV) demonstrated superior HO sensing activity of CNTs/LFO compared to pure LFO, attributed to accelerated electron transfer at the CNTs-modified interface. The optimized electrode exhibited excellent stability, a low detection limit of 0.005 μM, and a wide linear response range of 0.1-500 μM. These results highlight CNTs/LFO nanocomposites as highly promising candidates for advanced HO sensing and related electrochemical applications.

摘要

过氧化氢（HO）是生物系统中普遍存在的分子，但在浓度升高时，它会表现出细胞毒性，因此在生物医学和分析应用中都需要进行精确监测。在这项工作中，我们报告了一种经济高效的策略，用于合成具有不同LFO掺杂水平（0.5%、1%和2%）的碳纳米管/锂铁氧体（CNTs/LFO）纳米复合材料，用于非酶促HO传感。通过柠檬酸盐凝胶自燃烧路线制备了纳米复合材料，得到了均匀分散的结构。X射线衍射（XRD）和场发射扫描电子显微镜（FE-SEM）证实了存在平均粒径约为50nm的纳米片状颗粒的结晶铁氧体相。振动样品磁强计（VSM）显示，2%LFO组成的最大饱和磁化强度为25emu g。使用循环伏安法（CV）进行的电化学表征表明，与纯LFO相比，CNTs/LFO具有优异的HO传感活性，这归因于CNTs修饰界面处加速的电子转移。优化后的电极表现出优异的稳定性、0.005μM的低检测限和0.1-500μM的宽线性响应范围。这些结果突出了CNTs/LFO纳米复合材料作为先进HO传感及相关电化学应用极具潜力的候选材料。

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