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Related Experiment Video

Updated: Jan 6, 2026

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

Published on: July 18, 2025

Waterproof molecular monolayers stabilize 2D materials.

Cong Su^1,2, Zongyou Yin³, Qing-Bo Yan^1,4

¹Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.

Proceedings of the National Academy of Sciences of the United States of America

|October 3, 2019

Summary

This summary is machine-generated.

Linear alkylamines protect sensitive 2D van der Waals materials from corrosion. These molecular monolayers act as a drying layer, significantly extending the operational lifetime of materials like black phosphorus.

Keywords:

anticorrosion molecular monolayer stabilizer multilayer 2D materials

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Area of Science:

Materials Science
Surface Chemistry
Nanotechnology

Background:

Two-dimensional van der Waals materials possess unique optoelectronic properties.
Ambient conditions often lead to degradation and corrosion of these sensitive materials.

Purpose of the Study:

To investigate the protective capabilities of linear alkylamines against the degradation of 2D van der Waals materials.
To demonstrate a method for enhancing the stability and lifetime of materials like black phosphorus and transition-metal dichalcogenides.

Main Methods:

Application of linear alkylamines (n-C_m H_{2m+1}NH_2, m=4-11) as thin molecular monolayers.
Characterization of protected materials using techniques such as...
Theoretical analysis to understand the passivation mechanism.

Main Results:

Linear alkylamines effectively protect black phosphorus (BP) and transition-metal dichalcogenides (TMDs).
n-Hexylamine monolayers prolonged BP lifetime from hours to weeks/months.
Monolayers act as a selective drying layer, removing water molecules.

Conclusions:

Linear alkylamines provide robust passivation for 2D van der Waals materials.
The molecular monolayer coating is stable under various conditions but removable with specific acids.
This offers a promising strategy for preserving the functionality of advanced 2D materials.