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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 (http://creativecommons.org/licenses/by/4.0/), 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 https://doi.org/10.1186/s11671-020-3250-1 |
| Appears in Collections: | Journal/Magazine Article |
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