Room Temperature Micro-Photoluminescence Studies of Colloidal WS2Nanosheets

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OriginalspracheEnglisch
Seiten (von - bis)18841-18848
Seitenumfang8
FachzeitschriftJournal of Physical Chemistry C
Jahrgang125
Ausgabenummer34
Frühes Online-Datum20 Aug. 2021
PublikationsstatusVeröffentlicht - 2 Sept. 2021

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.

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Room Temperature Micro-Photoluminescence Studies of Colloidal WS2Nanosheets. / Frauendorf, André Philipp; Niebur, André; Harms, Lena et al.
in: Journal of Physical Chemistry C, Jahrgang 125, Nr. 34, 02.09.2021, S. 18841-18848.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Frauendorf AP, Niebur A, Harms L, Shree S, Urbaszek B, Oestreich M et al. Room Temperature Micro-Photoluminescence Studies of Colloidal WS2Nanosheets. Journal of Physical Chemistry C. 2021 Sep 2;125(34):18841-18848. Epub 2021 Aug 20. doi: 10.1021/acs.jpcc.1c06240
Frauendorf, André Philipp ; Niebur, André ; Harms, Lena et al. / Room Temperature Micro-Photoluminescence Studies of Colloidal WS2Nanosheets. in: Journal of Physical Chemistry C. 2021 ; Jahrgang 125, Nr. 34. S. 18841-18848.
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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.",
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AU - Frauendorf, André Philipp

AU - Niebur, André

AU - Harms, Lena

AU - Shree, Shivangi

AU - Urbaszek, Bernhard

AU - Oestreich, Michael

AU - Hübner, Jens

AU - Lauth, Jannika

N1 - 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’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’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 Universität Hannover.

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Y1 - 2021/9/2

N2 - 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.

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