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Ti3C2 Sheets with an Adjustable Surface and Feature Sizes to Regulate the Chemical Stability
Guohui Li1, Kun Jiang1, Sher Zaman1
1College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Suzhou 215123 , China.
Al oxyanion-coated and smaller two-dimensional (2D) MXene sheets exhibit enhanced chemical stability. This study reveals how surface groups and feature size impact MXene stability in oxidizing environments.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Two-dimensional (2D) sheet materials, particularly transition-metal carbides and nitrides (MXenes), offer versatile properties.
- Chemical stability is crucial for MXene applications, but systematic studies on surface and size effects are limited.
Purpose of the Study:
- To investigate the impact of surface functionalization and lateral dimensions on the chemical stability of Ti3C2 MXene sheets.
- To evaluate the performance of MXenes in oxidizing environments, including ambient air and hydrogen peroxide.
Main Methods:
- Systematic synthesis of Ti3C2 MXene sheets with varying surface groups (Al oxyanions, OH/F) and feature sizes (regular and ultrasmall).
- Assessment of chemical stability through analysis of phase, morphology, and optical properties under oxidative stress.
Main Results:
- MXene sheets functionalized with Al oxyanions demonstrated superior structural stability compared to those with OH/F or other species.
- Smaller lateral dimensions and thinner sheets exhibited improved oxidation resistance, hindering recrystallization to TiO2.
Conclusions:
- Surface passivation with Al oxyanions enhances MXene stability in oxidizing conditions.
- Engineering feature size, specifically reducing lateral dimensions, is an effective strategy to improve MXene oxidation resistance.
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