Tantalum disulfide quantum dots: preparation, structure, and properties

Liangliang Zhou, Chuli Sun, Xueming Li, Libin Tang, Wei Guo, Lin Luo, Meng Zhang, Kar Seng Teng, Fuli Qian, Chaoyu Lu, Jing Liang, Yugui Yao, Shu Ping Lau

Research output: Journal article publicationJournal articleAcademic researchpeer-review

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.].

Original languageEnglish
Article number20
JournalNanoscale Research Letters
Volume15
Issue number1
DOIs
Publication statusPublished - 1 Jan 2020

Keywords

  • First-principle
  • Modulating bandgap
  • Quantum dots
  • Transition metal dichalcogenides
  • Ultrasonic method

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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