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Fourier-transform infrared (FTIR) spectroscopy is now a reliable method for identifying and analyzing MXenes. This study presents experimental and calculated FTIR spectra for 12 typical MXene compositions, aiding material characterization.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • 2D Materials

Background:

  • MXenes are a rapidly expanding class of 2D materials with diverse applications.
  • Lack of systematic Fourier-transform infrared (FTIR) spectroscopy studies on MXenes leads to misinterpretation.
  • FTIR is a powerful technique for material characterization and fingerprinting.

Purpose of the Study:

  • To establish a systematic approach for FTIR spectroscopy of MXenes.
  • To provide experimental and calculated FTIR spectra for 12 typical MXene compositions.
  • To enable reliable identification and analysis of MXenes using FTIR.

Main Methods:

  • Experimental FTIR spectroscopy measurements (4000-400 cm⁻¹) on delaminated MXene flakes in KBr pellets.
  • Data processing including background correction and spectra smoothing.
  • Density functional theory (DFT) calculations for peak assignment and vibration mode analysis.

Main Results:

  • Comprehensive FTIR spectra for 12 distinct MXene compositions (5 transition metals, 4 basic structures).
  • Detailed instructions for MXene sample preparation, data collection, and spectral interpretation.
  • Precise assignment of characteristic FTIR peaks linked to specific bond vibrations in MXenes.

Conclusions:

  • FTIR spectroscopy, supported by DFT calculations, is a robust tool for MXene identification and analysis.
  • This work provides a foundational dataset and methodology for the 2D materials community.
  • Standardized FTIR analysis will prevent misinterpretation and advance MXene research and applications.