TY - JOUR
T1 - Tantalum disulfide quantum dots: preparation, structure, and properties
AU - Zhou, Liangliang
AU - Sun, Chuli
AU - Li, Xueming
AU - Tang, Libin
AU - Guo, Wei
AU - Luo, Lin
AU - Zhang, Meng
AU - Teng, Kar Seng
AU - Qian, Fuli
AU - Lu, Chaoyu
AU - Liang, Jing
AU - Yao, Yugui
AU - Lau, Shu Ping
PY - 2020/1/1
Y1 - 2020/1/1
N2 - 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.].
AB - 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.].
KW - First-principle
KW - Modulating bandgap
KW - Quantum dots
KW - Transition metal dichalcogenides
KW - Ultrasonic method
UR - http://www.scopus.com/inward/record.url?scp=85078478812&partnerID=8YFLogxK
U2 - 10.1186/s11671-020-3250-1
DO - 10.1186/s11671-020-3250-1
M3 - Journal article
AN - SCOPUS:85078478812
SN - 1931-7573
VL - 15
JO - Nanoscale Research Letters
JF - Nanoscale Research Letters
IS - 1
M1 - 20
ER -