In recent years, carbon dots (CDs) based hybrid nanomaterials have received considerable attention due to their outstanding optical and catalytic properties. Herein, CDs/Fe₃O₄ hybrid nanofibers are prepared via a facile electrospinning technique combined with a hydrothermal reaction and a thermochemical reduction process. During the synthetic process, α-Fe₂O₃ nanofibers are synthesized via electrospinning followed by a calcination process first. Then CDs modified α-Fe₂O₃ nanofibers can be obtained under a hydrothermal reaction. Finally, the prepared CDs modified α-Fe₂O₃ nanofibers are converted to CDs/Fe₃O₄ hybrid nanofibers through a thermochemical reduction process. The resulting CDs/Fe₃O₄ hybrid nanofibers show a superior peroxidase catalytic activity to individual CDs, α-Fe₂O₃ nanofibers, CDs/α-Fe₂O₃ hybrid nanofibers and commercial Fe₃O₄ nanoparticles. The steady-state kinetic assay exhibits an excellent affinity for TMB with a low Michaelis–Menten constant (K_m) value. On the basis of the high peroxidase-like activity of CDs/Fe₃O₄ hybrid nanofibers, a simple approach for the colorimetric detection of H₂O₂ and ascorbic acid (AA) with a low detection limit of 0.917 and 0.285 μM, respectively, is developed. This work inspires researchers to develop functional hybrid nanomaterials for fabricating superior biomimetic catalysts and extends their applications in biosensors and environmental monitoring.

中文翻译：

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碳点/ Fe ₃ O ₄杂化纳米纤维作为有效的过氧化物酶模拟物，可灵敏地检测H ₂ O ₂和抗坏血酸

近年来，基于碳点（CDs）的杂化纳米材料由于其出色的光学和催化性能而受到了广泛的关注。在此，CDs / Fe ₃ O ₄杂化纳米纤维是通过将水热反应和热化学还原过程结合在一起的简便的静电纺丝技术制备的。在合成过程中，的α-Fe ₂ ö ₃纳米纤维合成通过静电纺丝之后是煅烧过程第一。然后光盘改性的α-Fe _2个ö ₃纳米纤维可以在水热反应下获得。最后，将制备的光盘改性的α-Fe ₂ ö ₃纳米纤维通过热化学还原过程转化为CDs / Fe ₃ O ₄杂化纳米纤维。将所得的CD / Fe的₃ ö ₄混合纳米纤维显示优异的过氧化物酶的催化活性，以个人光盘，的α-Fe _2个ö ₃纳米纤维，CDS /的α-Fe ₂ ö ₃混合纳米纤维和商用铁₃ ö _4个纳米颗粒。稳态动力学分析对TMB具有极佳的亲和力，而Michaelis–Menten常数（K _m）值较低。基于CDs / Fe ₃ O ₄的高过氧化物酶样活性杂化纳米纤维，开发了一种比色检测H ₂ O ₂和抗坏血酸（AA）的简单方法，分别具有0.917和0.285μM的低检测限。这项工作启发了研究人员开发功能性杂化纳米材料，以制造卓越的仿生催化剂，并将其扩展到生物传感器和环境监测领域。