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Related Experiment Video

Updated: Mar 18, 2026

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol

Published on: December 20, 2016

Spatial non-uniformity in exfoliated WS2 single layers.

I Paradisanos¹, N Pliatsikas, P Patsalas

¹Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion, 71110 Crete, Greece. gnk@materials.uoc.gr stratak@iesl.forth.gr.

|July 7, 2016

Summary

Edges of tungsten disulfide (WS2) monolayers show enhanced photoluminescence (PL) due to oxygen interactions. This study reveals spatial non-uniformity in WS2 properties, crucial for nanophotonics and optoelectronic devices.

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

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Last Updated: Mar 18, 2026

Preparation of Liquid-exfoliated Transition Metal Dichalcogenide Nanosheets with Controlled Size and Thickness: A State of the Art Protocol

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Published on: December 20, 2016

Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication

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Published on: November 28, 2017

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

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

Published on: April 12, 2018

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Atomically thin transition metal dichalcogenides (TMDs) possess unique optoelectronic properties.
TMDs are promising for advanced nanophotonics and optoelectronic applications.

Purpose of the Study:

Investigate the spatial non-uniformity of photoluminescence (PL) and strain in exfoliated WS2 monolayers.
Understand the underlying mechanisms causing these non-uniformities.

Main Methods:

Photoluminescence (PL) spectroscopy
Auger electron imaging and spectroscopy
Raman spectroscopy

Main Results:

WS2 monolayer edges exhibit significantly higher PL intensity than their centers.
Spatial non-uniformity in electron density across the monolayer correlates with PL variations.
Oxygen chemisorption and physisorption are identified as key factors influencing PL non-uniformity.
Significant strain variations exist within monolayers, but without direct correlation to PL emission.

Conclusions:

Chemical bonding and oxygen interactions play a critical role in exciton behavior in WS2.
Findings offer insights for engineering nanophotonic functions in WS2 monolayers.
Results pave the way for developing novel TMD-based optoelectronic devices.