Room Temperature Micro-Photoluminescence Studies of Colloidal WS2Nanosheets
Abstract
Wet-chemical syntheses of quasi two-dimensional (2D) transition metal dichalcogenides (TMDs) have emerged as promising methods for straightforward solution-processing of these materials. However, the photoluminescence (PL) properties of colloidal TMDs are virtually unexplored due to the typically nonemitting synthesis products. In this work, we demonstrate room temperature micro-PL of delicate ultrathin colloidal WS2nanosheets synthesized from WCl6and elemental sulfur in oleic acid and oleylamine at 320 °C for the first time. Both mono- and multilayer PL are observed, revealing comparable characteristics to exfoliated TMD monolayers and underpinning the high quality of colloidal WS2nanosheets. In addition, promising long-term air stability of colloidal WS2nanosheets is found, and the control of photodegradation of the structures under laser excitation is identified as a challenge for further advancing the nanosheet monolayers. Our results render colloidal TMDs as easily synthesized and highly promising 2D semiconductors with optical properties fully competitive with conventionally fabricated ultrathin TMDs.
Details
- Organisationseinheit(en)
-
Institut für Festkörperphysik
Institut für Physikalische Chemie und Elektrochemie
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Laboratorium für Nano- und Quantenengineering
QuantumFrontiers
- Externe Organisation(en)
-
Carl von Ossietzky Universität Oldenburg
Université Toulouse III – Paul Sabatier (UT3)
- Typ
- Artikel
- Journal
- Journal of Physical Chemistry C
- Band
- 125
- Seiten
- 18841-18848
- Anzahl der Seiten
- 8
- ISSN
- 1932-7447
- Publikationsdatum
- 02.09.2021
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Elektronische, optische und magnetische Materialien, Allgemeine Energie, Physikalische und Theoretische Chemie, Oberflächen, Beschichtungen und Folien
- Elektronische Version(en)
-
https://arxiv.org/abs/2105.09593 (Zugang:
Offen
)
https://doi.org/10.1021/acs.jpcc.1c06240 (Zugang: Geschlossen )
