Supramolecular electrostatic functionalization of 1T-MoS₂ based on alkylammonium salts

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Chemical functionalization is crucial for tailoring the properties and manufacturing of 2D materials like molybdenum disulfide (MoS2).
• Existing methods often face challenges in achieving high yields, using sustainable reagents, and preserving the inherent properties of MoS2.

Purpose of the Study:

• To develop a green and efficient supramolecular functionalization strategy for 1T-phase MoS2.
• To achieve high functionalization yields while maintaining the material's crystalline structure and conductivity.
• To enable subsequent covalent post-functionalization for creating advanced material architectures.

Main Methods:

• Employed a supramolecular functionalization strategy utilizing electrostatic interactions between negatively charged 1T-MoS2 and positively charged alkylammonium salts.
• Conducted the functionalization process in water at room temperature, adhering to green chemistry principles.
• Utilized cholamine as the alkylammonium salt to introduce a reactive primary amine group for post-functionalization.

Main Results:

• Achieved a high functionalization yield with an alkylammonium:Mo ratio of 1:2.6.
• Preserved the characteristic crystalline phase and electrical conductivity of the 1T-MoS2 material.
• Demonstrated successful covalent post-functionalization via the amine group introduced by cholamine.

Conclusions:

• The reported supramolecular functionalization strategy offers a sustainable and effective method for modifying 1T-MoS2.
• This approach enhances the applicability of MoS2 by tuning its properties and enabling further chemical modifications.
• The method aligns with green chemistry requirements and preserves the critical characteristics of the 2D material.