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Automated Protocols for Macromolecular Crystallization at the MRC Laboratory of Molecular Biology

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Published on: January 24, 2018

Monolayer atomic crystal molecular superlattices.

Chen Wang¹, Qiyuan He², Udayabagya Halim²

¹Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, USA.

|March 9, 2018

Summary

Researchers developed a new electrochemical molecular intercalation method to create stable artificial superlattices from two-dimensional atomic crystals. This technique offers enhanced electronic properties and stability for advanced material applications.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Van der Waals heterostructures and artificial superlattices offer unique properties.
Existing fabrication methods like mechanical exfoliation and chemical-vapor deposition have limitations in yield, reproducibility, and scalability for complex structures.
Alkali metal ion intercalation leads to unstable superlattices with altered electronic properties.

Purpose of the Study:

To develop a novel and versatile method for fabricating stable artificial superlattices from two-dimensional atomic crystals.
To explore the potential of electrochemical molecular intercalation for creating tailored superlattice structures.
To investigate the electronic and stability properties of the resulting superlattices.

Main Methods:

Electrochemical molecular intercalation using quaternary ammonium molecules.
Fabrication of monolayer phosphorene molecular superlattices using black phosphorus.
Electrical transport studies of transistors based on the superlattices.

Main Results:

Demonstrated successful intercalation of black phosphorus with cetyl-trimethylammonium bromide, creating monolayer phosphorene molecular superlattices with doubled interlayer distance.
Achieved high on/off current ratios (>10^7), excellent mobility, and superior stability in transistors made from these superlattices.
Showcased the versatility of the method by intercalating other 2D materials (molybdenum disulfide, tungsten diselenide) with various molecules to tune properties.

Conclusions:

Electrochemical molecular intercalation is a versatile and effective approach for creating stable, tunable artificial superlattices from 2D atomic crystals.
This method provides a promising platform for fundamental research and technological applications requiring advanced material properties.
The ability to tailor molecular structures, interlayer distances, and electronic properties opens new avenues in materials design.