Antioxidants Unlock Shelf-Stable Ti3C2T (MXene) Nanosheet Dispersions
Antioxidants Unlock Shelf-Stable Ti3C2T (MXene) Nanosheet Dispersions
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DOI：
10.1016/j.matt.2019.05.020
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发表时间：
2019-08
期刊：
影响因子：
18.9
通讯作者：
Xiaofei Zhao;Aniruddh Vashisth;E. Prehn;Wanmei Sun;Smit Shah;T. Habib;Yexiao Chen;Zeyi Tan;
中科院分区：
文献类型：
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作者：
Xiaofei Zhao;Aniruddh Vashisth;E. Prehn;Wanmei Sun;Smit Shah;T. Habib;Yexiao Chen;Zeyi Tan;
尽管 MXene 纳米片引起了科学和工业界的广泛关注，但这些材料非常容易氧化，这会导致它们在几天内发生化学降解并丧失功能特性。在这里，我们展示了一种使用 L-抗坏血酸钠作为抗氧化剂来防止胶体 Ti3C2TxMXene 纳米片氧化的有效方法。该方法的成功体现在 Ti3C2TX 的稳定形态、结构和胶体稳定性上。即使存在水和氧气，21 天后，用 L-抗坏血酸钠处理的 Ti3C2Tx 纳米片的电导率比未经处理的 Ti3C2Tx 纳米片的电导率高出几个数量级。这种抗氧化性在干燥状态下也持续存在。我们建议 L-抗坏血酸钠保护纳米片的边缘，限制水分子与其他反应位点的接触；这得到了分子动力学模拟的支持，该模拟显示了抗坏血酸阴离子与纳米片边缘的关联。
Although MXene nanosheets have attracted significant scientific and industrial attention, these materials are highly susceptible to oxidation, which leads to their chemical degradation and loss of functional properties in a matter of days. Here we demonstrate an effective method to prevent the oxidation of colloidal Ti3C2TxMXene nanosheets by using sodium L-ascorbate as an antioxidant. The success of the method is evident in the stable morphology, structure, and colloidal stability of Ti3C2Tx. Even in the presence of water and oxygen, the electrical conductivity of Ti3C2Txnanosheets treated with sodium L-ascorbate was orders of magnitude higher as compared with untreated ones after 21 days. This resistance to oxidation also persists in the dried state. We propose that the sodium L-ascorbate protects the edges of the nanosheets, restricting water molecules from otherwise reactive sites; this is supported by molecular dynamics simulations that show association of the ascorbate anion with the nanosheet edge.