Nitrogen-Doped Ti2C MXene Quantum Dots as Antioxidants
Nitrogen-Doped Ti2C MXene Quantum Dots as Antioxidants
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DOI：
10.1021/acsanm.1c02783
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发表时间：
2021-11-26
影响因子：
5.9
通讯作者：
Zhang, Jinzhong
中科院分区：
文献类型：
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作者：
Gou, Jingyun;Zhao, Lin;Zhang, Jinzhong
MXene、过渡金属碳化物、氮化物或碳氮化物可以合成为零维量子点（MQD），由于它们能够与许多强氧化剂发生反应，因此在抗氧化应用方面具有巨大的潜力。然而，MQD在水热合成过程中很容易被氧化，从而破坏其内在结构并削弱其抗氧化能力。为了解决这个问题，使用乙二胺（EDA）作为前体来保护 Ti2C-MQD 在合成过程中免受损坏，并引入 N 来生成氮掺杂 MQD（N-Ti2C-QD）。与不含EDA的MQD相比，N-Ti2C-QD具有更完整的内在结构，并表现出更强的抗氧化性能，包括高效清除中心点OH、优异的染料保护和快速还原高锰酸钾（KMnO4）。此外，循环伏安法（CV）和X射线光电子能谱（XPS）被用来研究氧化后潜在的抗氧化机制。结果表明，本征结构、富电子官能团的掺杂和电子转移都有助于其强大的抗氧化能力。
MXenes, transition metal carbides, and nitrides or carbonitrides can be synthesized as zero-dimensional quantum dots (MQDs), which have great potential for antioxidizing applications due to their ability to react with many strong oxidizers. However, MQDs can be easily oxidized during hydrothermal synthesis, which damages their intrinsic structures and impairs their antioxidant abilities. To address this issue, ethylenediamine (EDA) was used as a precursor to protect Ti2C-MQDs from damage during synthesis, and N was introduced to generate N-doped MQDs (N-Ti2C-QDs). Compared to MQDs without EDA, the N-Ti2C-QDs had a more complete intrinsic structure and exhibited a stronger antioxidant performance, including highly effective scavenging of center dot OH, excellent protection of dye and rapid reduction of potassium permanganate (KMnO4). In addition, cyclic voltammetry (CV) and X-ray photoelectron spectroscopy (XPS) were used to study the underlying antioxidation mechanism that follows oxidation. The results revealed that the intrinsic structure, doping with electron-rich functional groups and electron transfer all contribute to the strong antioxidant ability.