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Title: Multimodal Spectroscopic Study of Surface Termination Evolution in Cr2TiC2Tx MXene

Journal Article · · Advanced Materials Interfaces
ORCiD logo [1];  [2];  [3];  [4];  [5];  [5]; ORCiD logo [6];  [2];  [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States)
  2. Drexel Univ., Philadelphia, PA (United States)
  3. U.S. Naval Research Lab., Washington, DC (United States)
  4. Stony Brook Univ., NY (United States)
  5. Air Force Research Lab. Materials and Manufacturing Directorate, Wright‐Patterson Air Force Base, OH (United States)
  6. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

Control of surface functionalization of MXenes holds great potential, and in particular, may lead to tuning of magnetic and electronic order in the recently reported magnetic Cr2TiC2Tx. Here, vacuum annealing experiments of Cr2TiC2Tx are reported with in situ electron energy loss spectroscopy and novel in situ Cr K–edge extended energy loss fine structure analysis, which directly tracks the evolution of the MXene surface coordination environment. These in situ probes are accompanied by benchmarking synchrotron X–ray absorption fine structure measurements and density functional theory calculations. With the etching method used here, the MXene has an initial termination chemistry of Cr2TiC2O1.3F0.8. Annealing to 600 °C results in the complete loss of –F, but O termination is thermally stable up to (at least) 700 °C. These findings demonstrate thermal control of –F termination in Cr2TiC2Tx and offer a first step toward termination engineering this MXene for magnetic applications. Furthermore, this work demonstrates high energy electron spectroscopy as a powerful approach for surface characterization in 2D materials.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation
Grant/Contract Number:
SC0012704; SC0018618
OSTI ID:
1764594
Report Number(s):
BNL--220993-2021-JAAM
Journal Information:
Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 5 Vol. 8; ISSN 2196-7350
Publisher:
Wiley-VCHCopyright Statement
Country of Publication:
United States
Language:
English

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