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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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Tail-Group Modulated Covalent Functionalization of Solvent-Dispersible MXenes for Selectivity-Tunable Gas Sensing at
Seongeun Lee1,2, Tae Yun Ko3,4, Ajit K Jena5
1Extreme Materials Research Center, Korea Institute of Science and Technology, Seoul, 02792, South Korea.
Small (Weinheim an Der Bergstrasse, Germany)
|September 18, 2025
Summary
Researchers developed a new method to functionalize MXene materials for highly selective gas sensing. This approach tailors MXene surfaces to detect specific gases like ammonia, acetone, or ethanol with improved sensitivity and reduced cross-reactivity.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Highly selective and sensitive gas sensors are crucial for diverse applications.
- MXenes, particularly Ti3C2Tx, show promise for chemiresistive gas sensing due to their conductivity and surface properties.
- Existing MXene sensors often lack tailored selectivity for specific target gases.
Purpose of the Study:
- To demonstrate a versatile strategy for covalently functionalizing Ti3C2Tx MXenes.
- To enable tunable gas selectivity by modifying MXene surface energy.
- To develop advanced MXene-based sensors for multi-target gas detection.
Main Methods:
- Covalent functionalization of Ti3C2Tx MXenes using diazonium salts with diverse tail groups (hydrophilic and hydrophobic).
- Systematic modulation of MXene surface energy by grafting sulfanilic acid, 4-octylaniline, and 4-(heptadecafluorooctyl)aniline diazonium salts.
- Density functional theory (DFT) calculations to investigate gas adsorption energies and ligand-specific interactions.
Main Results:
- Functionalized MXenes exhibited distinct gas response patterns, minimizing cross-reactivity.
- Achieved high selectivity towards specific gases such as ammonia, acetone, or ethanol.
- Demonstrated significantly enhanced gas sensitivity compared to pristine MXene, attributed to ligand-specific interactions via DFT.
Conclusions:
- Ligand-tailored functionalization of MXenes via diazotization chemistry provides precise control over gas selectivity.
- The strategy enables tuning of gas selectivity by controlling tail group structure and ligand grafting density.
- This approach offers a versatile platform for developing advanced MXene-based multi-target gas sensors.
