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1. Ti ₂ CT _x MXene‐based all‐optical modulator

   https://doi.org/10.1002/inf2.12052  

   Yi, Jun; Li, Jie; Huang, Shuohan; Hu, Longyu; Miao, Lili; Zhao, Chujun; Wen, Shuangchun; Mochalin, Vadym N.; Rao, Apparao M. (December 2019, InfoMat)

   Abstract MXenes, a new class of 2D transition metal carbides, nitrides, and carbonitrides, have attracted much attention due to their outstanding properties. Here, we report the broadband spatial self‐phase modulation of Ti₂CT_xMXene nanosheets dispersed in deionized water in the visible to near‐infrared regime, highlighting the broadband nonlinear optical (NLO) response of Ti₂CT_xMXene. Using ultrafast pulsed laser excitation, the nonlinear refractive indexn₂and the third‐order nonlinear susceptibilityof Ti₂CT_xMXene were measured to be ∼10⁻¹³m²/W and ∼ 10⁻¹⁰esu, respectively. Leveraging the large optical nonlinearity of Ti₂CT_xMXene, an all‐optical modulator in the visible regime was fabricated based on the spatial cross‐phase modulation effect. This work suggests that 2D MXenes are ideal broadband NLO materials with excellent prospects in NLO applications. image 

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2. 3D printing aqueous Ti ₃ C ₂ T _x inks for MXene-based energy devices

   https://doi.org/10.1039/D3MA00096F  

   Fagade, Mofetoluwa; Patil, Dhanush; Thummalapalli, Sri Vaishnavi; Jambhulkar, Sayli; Ravichandran, Dharneedar; Kannan, Arunachala M.; Song, Kenan (September 2023, Materials Advances)

   Thein situHF acid etching of Ti₃AlC₂yielded multilayered Ti₃C₂. Sonication delaminated nanosheets, suspended in DI water, post rheological optimization 3D printed using DIW platform to produce conductive patterns of MXene. 

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3. Multimodal Spectroscopic Study of Surface Termination Evolution in Cr ₂ TiC ₂ T _x MXene

   https://doi.org/10.1002/admi.202001789  

   Hart, James_L; Hantanasirisakul, Kanit; Lang, Andrew_C; Li, Yuanyuan; Mehmood, Faisal; Pachter, Ruth; Frenkel, Anatoly_I; Gogotsi, Yury; Taheri, Mitra_L (January 2021, Advanced Materials Interfaces)

   Abstract 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 Cr₂TiC₂T_x. Here, vacuum annealing experiments of Cr₂TiC₂T_xare 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 Cr₂TiC₂O_1.3F_0.8. 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 Cr₂TiC₂T_xand offer a first step toward termination engineering this MXene for magnetic applications. Moreover, this work demonstrates high energy electron spectroscopy as a powerful approach for surface characterization in 2D materials. 

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4. Tuning Water Transport through Nanochannels of Robust Cation‐Intercalated Ti ₃ C ₂ T _x MXene Membranes

   https://doi.org/10.1002/cssc.202500837  

   Rad, Vahid; A_Shamsabadi, Ahmad; Aghaei, Amir; Wyatt, Brian C; Jahanbakhshi, Farzaneh; Thakur, Anupma; Fang, Hui; Sadrzadeh, Mohtada; Anasori, Babak; Rappe, Andrew M; et al (August 2025, ChemSusChem)

   Ti₃C₂T_xMXene membranes have attracted considerable interest due to their exceptional water transport properties, yet the role of cation intercalation on governing transport remains poorly understood. In this experimental and theoretical study, it shows how intercalation with K⁺, Na⁺, Li⁺, Ca²⁺, and Mg²⁺modulates both the nanochannel architecture and water flux of Ti₃C₂T_xmembranes. Unlike in graphene oxide analogs, cations with larger hydration diameters in Ti₃C₂T_xexpand the interlayer spacing, widening flow channels, enhancing slip length of these nanochannels, and boosting water flux from 31.45 to 61.86 L m⁻² h⁻¹. To overcome intrinsically poor adhesion of Ti₃C₂T_xto polymeric supports, this study incorporates a thin polyvinyl‐alcohol interlayer, which substantially enhances mechanical robustness and structural integrity. Together, these findings elucidate how cation hydration controls water transport and offer a flexible strategy for tailoring MXene membrane performance. 

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5. Operando Tracking of Resistance, Thickness, and Mass of Ti ₃ C ₂ T _x MXene in Water‐in‐Salt Electrolyte

   https://doi.org/10.1002/aenm.202405028  

   Perju, Audrey; Zhang, Danzhen; Wang, Ruocun_John; Taberna, Pierre‐Louis; Gogotsi, Yury; Simon, Patrice (January 2025, Advanced Energy Materials)

   Abstract MXenes are among the fastest‐growing families of 2D materials, promising for high‐rate, high‐energy energy storage applications due to their high electronic and ionic conductivity, large surface area, and reversible surface redox ability. The Ti₃C₂T_xMXene shows a capacitive charge storage mechanism in diluted aqueous LiCl electrolyte while achieving abnormal redox‐like features in the water‐in‐salt LiCl electrolyte. Herein, variousoperandotechniques are used to investigate changes in resistance, mass, and electrode thickness of Ti₃C₂T_xduring cycling in salt‐in‐water and water‐in‐salt LiCl electrolytes. Significant resistance variations due to interlayer space changes are recorded in the water‐in‐salt LiCl electrolyte. In both electrolytes, conductivity variations attributed to charge carrier density changes or varied inter‐sheet electron hopping barriers are detected in the capacitive areas, where no thickness variations are observed. Overall, combining thoseoperandotechniques enhances the understanding of charge storage mechanisms and facilitates the development of MXene‐based energy storage devices. 

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