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Direct Solution-Phase Synthesis and Functionalization of 2D WSe2 for Ambient Stability
Suchithra Padmajan Sasikala1, Prem Prabhakaran2, Sambath Baskaran1
1Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 4, 2023
Summary
Researchers developed a scalable solution method to produce stable, few-layer 2D tungsten diselenide (WSe2) sheets. This breakthrough enables mass production of this 2D semiconductor for diverse applications.
Area of Science:
- Materials Science
- Nanotechnology
- 2D Materials
Background:
- 2H phase tungsten diselenide (WSe2) is a p-type 2D semiconductor with valuable optoelectrical properties.
- Producing atomically thin WSe2 in solution is difficult due to its instability.
- Transition metal dichalcogenides (TMDs) offer unique electronic characteristics.
Purpose of the Study:
- To develop an efficient and scalable solution-based method for exfoliating and functionalizing 2D WSe2.
- To overcome the ambient instability challenges associated with WSe2 production.
- To enable mass production of solution-processable WSe2.
Main Methods:
- Utilizing non-covalent interactions between mercapto-groups and bulk WSe2 for exfoliation and functionalization.
- Employing a water-ethanol mixture for the production process.
- Characterizing the produced WSe2 sheets using XPS, Raman, and FTIR spectroscopy.
Main Results:
- Successfully produced single and few-layer 2H phase pure WSe2 sheets with lateral sizes up to 5 μm.
- Achieved minimal basal plane defects in the exfoliated WSe2 sheets.
- Demonstrated high stability of WSe2 dispersions (up to 10 mg/mL) with colloidal shelf-life exceeding one year.
Conclusions:
- Precise manipulation of intercalation chemistry enables mass production of solution-processable 2D WSe2.
- The developed method overcomes stability issues, facilitating practical applications of WSe2.
- This advancement paves the way for wider utilization of phase-sensitive 2D materials.
