Room Temperature Micro-Photoluminescence Studies of Colloidal WS₂Nanosheets

authored by: André Philipp Frauendorf, André Niebur, Lena Harms, Shivangi Shree, Bernhard Urbaszek, Michael Oestreich, Jens Hübner, Jannika Lauth
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.
Organisation(s): Institute of Solid State Physics
Institute of Physical Chemistry and Electrochemistry
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
Laboratory of Nano and Quantum Engineering
QuantumFrontiers
External Organisation(s): Carl von Ossietzky University of Oldenburg
Universite Toulouse III - Paul Sabatier (UT3)
Type: Article
Journal: Journal of Physical Chemistry C
Volume: 125
Pages: 18841-18848
No. of pages: 8
ISSN: 1932-7447
Publication date: 02.09.2021
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, General Energy, Physical and Theoretical Chemistry, Surfaces, Coatings and Films
Electronic version(s): https://arxiv.org/abs/2105.09593 (Access: Open)
https://doi.org/10.1021/acs.jpcc.1c06240 (Access: Closed)

BibTeX

@article{3597ab0c03ce437ca3a9a4d8b49048a0,
title = "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.",
author = "Frauendorf, {Andr{\'e} Philipp} and Andr{\'e} Niebur and Lena Harms and Shivangi Shree and Bernhard Urbaszek and Michael Oestreich and Jens H{\"u}bner and Jannika Lauth",
note = "Funding Information: The authors thank the Laboratory for Nano and Quantum Engineering (LNQE) in Hannover for access to the TEM. The authors thank Armin Feldhoff for providing the XRD facility and Nadja-C. Bigall and Dirk Dorfs for access to the UV-Vis-NIR absorption spectrometer. J.H. and M.O. gratefully acknowledge the financial support by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy -EXC-2123 QuantumFrontiers—390837967 and HU 1318/4-1. J.L. greatly acknowledges funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453). J.L. is thankful for funding by the Caroline Herschel program of the Leibniz Universit{\"a}t Hannover.",
year = "2021",
month = sep,
day = "2",
doi = "10.1021/acs.jpcc.1c06240",
language = "English",
volume = "125",
pages = "18841--18848",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "34",
}

Room Temperature Micro-Photoluminescence Studies of Colloidal WS2Nanosheets

Room Temperature Micro-Photoluminescence Studies of Colloidal WS₂Nanosheets