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Journal article
On the organization and thermal behavior of functional groups on Ti3C2 MXene surfaces in vacuum
2d materials, v 5(1)
01 Jan 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The two-dimensional (2D) MXene Ti(3)C(2)Tx is functionalized by surface groups (T-x) that determine its surface properties for, e.g. electrochemical applications. The coordination and thermal properties of these surface groups has, to date, not been investigated at the atomic level, despite strong variations in the MXene properties that are predicted from different coordinations and from the identity of the functional groups. To alleviate this deficiency, and to characterize the functionalized surfaces of single MXene sheets, the present investigation combines atomically resolved in situ heating in a scanning transmission electron microscope (STEM) and STEM simulations with temperature-programmed x-ray photoelectron spectroscopy (TP-XPS) in the room temperature to 750 degrees C range. Using these techniques, we follow the surface group coordination at the atomic level. It is concluded that the F and O atoms compete for the DFT-predicted thermodynamically preferred site and that at room temperature that site is mostly occupied by F. At higher temperatures, F desorbs and is replaced by O. Depending on the O/F ratio, the surface bare MXene is exposed as F desorbs, which enables a route for tailored surface functionalization.
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Details
- Title
- On the organization and thermal behavior of functional groups on Ti3C2 MXene surfaces in vacuum
- Creators
- Ingemar Persson - Linköping UniversityLars-Ake Naslund - Linköping UniversityJoseph Halim - Drexel UniversityMichel W. Barsoum - Drexel UniversityVanya Darakchieva - Linköping UniversityJustinas Palisaitis - Linköping UniversityJohanna Rosen - Linköping UniversityPer O. A. Persson - Linkopings Univ, Thin Film Phys Div, Dept Phys Chem & Biol, SE-58183 Linkoping, Sweden
- Publication Details
- 2d materials, v 5(1)
- Publisher
- Iop Publishing Ltd
- Number of pages
- 10
- Grant note
- RIF14-0074 / Swedish Foundation for Strategic Research (SSF); Swedish Foundation for Strategic Research 2009 00971 / Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University 621-20124359; 622-2008-405; 2013-5580; 2016-04412; 642-2013-8020 / Swedish Research Council; European Commission KAW 2015.0043 / Knut and Alice Wallenberg's Foundation; Knut & Alice Wallenberg Foundation
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000412302100002
- Scopus ID
- 2-s2.0-85040115529
- Other Identifier
- 991019168087304721
UN Sustainable Development Goals (SDGs)
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied