MXenes公司
材料科学
吸附
氮化物
化学工程
辐照
分子
电导率
离子
表面能
碳化物
过渡金属
化学物理
图层(电子)
纳米技术
物理化学
复合材料
有机化学
化学
催化作用
核物理学
工程类
物理
作者
Shyamapada Patra,N Usha Kiran,Pratap Mane,Brahmananda Chakraborty,Laxmidhar Besra,Sriparna Chatterjee,Shyamal Chatterjee
标识
DOI:10.1016/j.surfin.2023.102969
摘要
Two-dimensional nanostructured (2D) layers of transition metal nitrides, carbides, or carbonitrides, known as MXenes, are inherently hydrophilic mainly due to the presence of surface terminating groups like –O, -OH, etc. In this work, hydrophilic MXenes have been converted to hydrophobic ones by low-energy N+ ion irradiation at different fluences. The removal of surface functional groups after irradiation is supported by various characterizations. DFT simulations confirm the strong influence of -OH and -O-OH on the hydrophilic nature of pristine MXene. Adsorption energy data reveals that the adsorption of water molecules on surface terminal group-free MXenes is energetically unfavorable, pointing towards hydrophobic character. Ion irradiation is exploited as a tool to partially remove the surface-terminating functional groups to make MXenes hydrophobic. Additionally, a remarkable enhancement in electrical conductivity has been noticed with increase in ion fluence, which can also be attributed to preferential sputtering of the functional groups and the structural change of MXene.
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