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Fabrication of Ti3C2 MXene Microelectrode Arrays for In Vivo Neural Recording
Published on: February 12, 2020
Surface reduction boosts free electron concentration in MXene for enhanced photothermal performance
Haoming Ding1,2, Xiao Tong1,2, Yong Zhang1,2,3
1Department of Biomedical Engineering, College of Biomedicine, City University of Hong Kong, Hong Kong SAR, China.
Science Advances
|May 13, 2026
Summary
Researchers enhanced the photothermal properties of MXenes (a 2D material) by optimizing electron concentration using a novel sodium-mediated reduction strategy. This improved efficiency for applications like antibacterial wound dressings.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- MXenes exhibit photothermal properties due to high free electron concentration, crucial for applications like antibacterial wound dressings.
- Intrinsic electron concentration in MXenes is limited by d-orbital occupancy and electronegative terminations, hindering optimal performance.
- Localized surface plasmon resonance in MXenes is directly linked to their free electron density.
Purpose of the Study:
- To enhance the photothermal properties of MXenes by increasing their free electron concentration.
- To develop a surface reduction strategy for optimizing MXene electronic properties.
- To investigate the potential of modified MXenes in photothermal antibacterial applications.
Main Methods:
- A sodium-mediated surface reduction strategy was employed in molten salts to treat Ti3C2 MXene.
- Electronic modulation was used to optimize the surface coordination environment, mitigating electron-withdrawing and scattering effects.
- Electron injection into Ti-3d states was performed for controlled state filling.
Main Results:
- The sodium-mediated reduction significantly increased free electron concentration (4.92x), carrier mobility (2.63x), and electrical conductivity (12.96x) compared to pristine MXene.
- The optimized Ti3C2 MXene achieved a high photothermal conversion efficiency of 91.66% under 808-nm laser irradiation.
- A photothermal antibacterial woundplast utilizing the modified MXene demonstrated a high bacterial kill rate.
Conclusions:
- The sodium-mediated surface reduction is an effective method for tuning MXene photothermal properties by enhancing electron concentration.
- Optimized MXenes show great promise for applications requiring tailored surface chemistry and high electron density, such as advanced wound care.
- This strategy provides a pathway for developing high-performance MXene-based photothermal agents.
