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Title: Tantalum disulfide quantum dots : preparation, structure, and properties
Authors: Zhou, L
Sun, C
Li, X
Tang, L
Guo, W
Luo, L
Zhang, M
Teng, KS
Qian, F
Lu, C
Liang, J
Yao, Y
Lau, SP 
Issue Date: 2020
Source: Nanoscale research letters, 2020, v. 15, no. 1, 20
Abstract: Abstract: Tantalum disulfide (TaS2) two-dimensional film material has attracted wide attention due to its unique optical and electrical properties. In this work, we report the preparation of 1 T-TaS2 quantum dots (1 T-TaS2 QDs) by top-down method. Herein, we prepared the TaS2 QDs having a monodisperse grain size of around 3 nm by an effective ultrasonic liquid phase exfoliation method. Optical studies using UV-Vis, PL, and PLE techniques on the as-prepared TaS2 QDs exhibited ultraviolet absorption at 283 nm. Furthermore, we found that dimension reduction of TaS2 has led to a modification of the band gap, namely a transition from indirect to direct band gap, which is explained using first-principle calculations. By using quinine as reference, the fluorescence quantum yield is 45.6%. Therefore, our results suggest TaS2 QDs have unique and extraordinary optical properties. Moreover, the low-cost, facile method of producing high quality TaS2 QDs in this work is ideal for mass production to ensure commercial viability of devices based on this material. Graphical abstract: TaS2 quantum dots having a monodisperse grain size of around 3 nm have been prepared by an ultrasonic liquid phase exfoliation method, it has been found that the dimension reduction of TaS2 has led to a transition from indirect to direct band gap that results in the unique and extraordinary optical properties (PL QY: 45.6%).[Figure not available: see fulltext.].
Keywords: First-principle
Modulating bandgap
Quantum dots
Transition metal dichalcogenides
Ultrasonic method
Publisher: Springer
Journal: Nanoscale research letters 
ISSN: 1931-7573
EISSN: 1556-276X
DOI: 10.1186/s11671-020-3250-1
Rights: © The Author(s). 2020 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
The following publication Zhou, L., Sun, C., Li, X. et al. Tantalum disulfide quantum dots: preparation, structure, and properties. Nanoscale Res Lett 15, 20 (2020), is available at
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