Ti3C2Tx MXene Quantum Dots with Enhanced Stability for Ultrafast Photonics

Fumei Yang, Yanqi Ge, Teng Yin, Jia Guo, Feng Zhang, Xian Tang, Meng Qiu, Weiyuan Liang, Ning Xu, Cong Wang, Yufeng Song, Shixiang Xu, Sanshui Xiao*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


MXenes,as an emerging group of two-dimensional materials, have attracted significant interest for diverse photoelectric applicationsby virtue of their tunable terminated surface, excellent electrical conductivity, and strong nonlinear optical response. They are usually synthesized via strategies involving hydrofluoric acid, which may result in oxygenic and hydrophilic termination groups on the MXene surface and thus decrease their stability in air. Herein, a mild synthesis method based on electrochemical exfoliation is proposed to prepare Ti3C2Tx MXene quantum dots (QDs), which are highly fluorinated to enhance stability. The open-aperture Z-scan system was employed to measure the nonlinear transmittance of the MXene QDs and proves their broadband saturable absorption from 540 to 1550nm. By integrating the MXene QD saturable absorber into an ytterbium-doped fiber laser, a set of highly stable 357 ps mode-locked pulses centered at 1069.17nm was achieved under a low threshold power of 54mW. In addition, tunable mode-locked optical spectra could be observed in the cavity when switching the polarization state. This work provides an environmentally friendly approach to synthesize stable MXene QDs and opens an avenue for the realization of low-threshold and tunable photonics applications based on MXene QDs.
Original languageEnglish
JournalACS Applied Nano Materials
Number of pages11
Publication statusAccepted/In press - 2021


  • Ti3C2Tx MXene quantum dots
  • Nonlinear optical properties
  • Saturable absorbers
  • Mode-locked fiber lasers
  • Pulsed laser generation
  • Fluorination

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