Effects of Direct Solvent-Quantum Dot Interaction on the Optical Properties of Colloidal Monolayer WS2 Quantum Dots

Nano Letters
Ho JinDong Hee Son

Abstract

Because of the absence of native dangling bonds on the surface of the layered transition metal dichalcogenides (TMDCs), the surface of colloidal quantum dots (QDs) of TMDCs is exposed directly to the solvent environment. Therefore, the optical and electronic properties of TMDCS QDs are expected to have stronger influence from the solvent than usual surface-passivated QDs due to more direct solvent-QD interaction. Study of such solvent effect has been difficult in colloidal QDs of TMDC due to the large spectroscopic heterogeneity resulting from the heterogeneity of the lateral size or (and) thickness in ensemble. Here, we developed a new synthesis procedure producing the highly uniform colloidal monolayer WS2 QDs exhibiting well-defined photoluminescence (PL) spectrum free from ensemble heterogeneity. Using these newly synthesized monolayer WS2 QDs, we observed the strong influence of the aromatic solvents on the PL energy and intensity of monolayer WS2 QD beyond the simple dielectric screening effect, which is considered to result from the direct electronic interaction between the valence band of the QDs and molecular orbital of the solvent. We also observed the large effect of stacking/separation equilibrium on the PL spectrum...Continue Reading

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Citations

Dec 28, 2018·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Xuanyu CaoYuezhong Xian
Mar 5, 2021·Accounts of Chemical Research·Yifan SunRaymond E Schaak
May 7, 2021·Nanoscale·Yuanqing XuYong Zhang
Oct 3, 2019·ACS Nano·Andrés Granados Del ÁguilaQihua Xiong
Sep 29, 2020·ACS Applied Materials & Interfaces·Yuanqing XuYong Zhang
Jul 3, 2021·Advanced Materials·Wei ZhaiHua Zhang

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