In:
Nanoscale Research Letters, Springer Science and Business Media LLC, Vol. 15, No. 1 ( 2020-12)
Abstract:
Tantalum disulfide (TaS 2 ) 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-TaS 2 quantum dots (1 T-TaS 2 QDs) by top-down method. Herein, we prepared the TaS 2 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 TaS 2 QDs exhibited ultraviolet absorption at 283 nm. Furthermore, we found that dimension reduction of TaS 2 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 TaS 2 QDs have unique and extraordinary optical properties. Moreover, the low-cost, facile method of producing high quality TaS 2 QDs in this work is ideal for mass production to ensure commercial viability of devices based on this material. Graphical abstract TaS 2 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 TaS 2 has led to a transition from indirect to direct band gap that results in the unique and extraordinary optical properties (PL QY: 45.6%).
Type of Medium:
Online Resource
ISSN:
1931-7573
,
1556-276X
DOI:
10.1186/s11671-020-3250-1
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2020
detail.hit.zdb_id:
2253244-4
detail.hit.zdb_id:
3149496-1
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