MXenes公司
X射线光电子能谱
碳化物
材料科学
过渡金属
分析化学(期刊)
金属
纳米技术
化学
化学工程
冶金
环境化学
生物化学
工程类
催化作用
作者
Joseph Halim,Kevin M. Cook,Michael Naguib,Per Eklund,Yury Gogotsi,Johanna Rosén,Michel W. Barsoum
标识
DOI:10.1016/j.apsusc.2015.11.089
摘要
In this work, a detailed high resolution X-ray photoelectron spectroscopy (XPS) analysis is presented for select MXenes—a recently discovered family of two-dimensional (2D) carbides and carbonitrides. Given their 2D nature, understanding their surface chemistry is paramount. Herein we identify and quantify the surface groups present before, and after, sputter-cleaning as well as freshly prepared vs. aged multi-layered cold pressed discs. The nominal compositions of the MXenes studied here are Ti3C2Tx, Ti2CTx, Ti3CNTx, Nb2CTx and Nb4C3Tx, where T represents surface groups that this work attempts to quantify. In all the cases, the presence of three surface terminations, O, OH and F, in addition to OH-terminations relatively strongly bonded to H2O molecules, was confirmed. From XPS peak fits, it was possible to establish the average sum of the negative charges of the terminations for the aforementioned MXenes. Based on this work, it is now possible to quantify the nature of the surface terminations. This information can, in turn, be used to better design and tailor these novel 2D materials for various applications.
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