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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

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Solution-processable exfoliation and suspension of atomically thin WSe2.

Daniel Gerchman¹, Annelise Kopp Alves¹

¹Ceramic Materials Laboratory, Federal University of Rio Grande do Sul, Osvaldo Aranha Av., 99/709, Porto Alegre 90035-190, Brazil.

Journal of Colloid and Interface Science

|February 8, 2016

Summary

Researchers optimized liquid exfoliation for tungsten diselenide (WSe2) nanosheets. A 30% propan-2-ol in water mixture yielded high concentrations, offering a cost-effective, scalable method for optoelectronics.

Keywords:

Layered materials Liquid exfoliation Semiconductors Surface properties WSe(2)

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Area of Science:

Materials Science
Nanotechnology
Condensed Matter Physics

Background:

Scalable production of low-dimensional semiconductors like tungsten diselenide (WSe2) is essential for advanced optoelectronic applications.
Liquid exfoliation offers a low-temperature, solution-processable route for fabricating WSe2 nanosheets.

Purpose of the Study:

To optimize the liquid exfoliation process for maximizing WSe2 nanosheet concentration.
To identify the most effective solvent systems for high-yield production of WSe2 suspensions.

Main Methods:

Investigated liquid exfoliation of tungsten diselenide (WSe2) using pure solvents, mixed solvents, and aqueous solutions with surfactants.
Compared exfoliation efficiencies across different solvent strategies to maximize nanosheet concentration.
Analyzed the influence of solvent properties, including surface tension and molecular size.

Main Results:

N-methylpyrrolidone yielded the highest concentration among pure solvents.
A mixture of 30% propan-2-ol in water significantly outperformed N-methylpyrrolidone, providing a low-cost alternative.
Optimal surface tension for exfoliation was determined to be 28 mN m⁻¹.
Anionic surfactants enabled successful WSe2 exfoliation in aqueous solutions.

Conclusions:

A 30% propan-2-ol in water mixture is a highly effective and economical solvent for producing concentrated WSe2 nanosheet suspensions.
The study identified key parameters for high-yield liquid exfoliation, crucial for scalable manufacturing of WSe2-based optoelectronic devices.