Highly Enhanced Photoluminescence of Monolayer MoS2 in Plasmonic Hybrids with Double-Layer Stacked Ag Nanoparticles

Ruhao Pan; Jianyu Kang; Yutong Li; Zhongshan Zhang; Renfei Li; Yang Yang

doi:10.1021/acsami.1c21960

Highly Enhanced Photoluminescence of Monolayer MoS₂ in Plasmonic Hybrids with Double-Layer Stacked Ag Nanoparticles

ACS Appl Mater Interfaces. 2022 Mar 16;14(10):12495-12503. doi: 10.1021/acsami.1c21960. Epub 2022 Feb 17.

Authors

Ruhao Pan¹, Jianyu Kang¹, Yutong Li², Zhongshan Zhang¹, Renfei Li¹, Yang Yang¹

Affiliations

¹ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, China.
² College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.

PMID: 35175732
DOI: 10.1021/acsami.1c21960

Abstract

In this work, a feasible method was proposed to prepare MoS₂-based plasmonic hybrid systems with high photoluminescence (PL) emission enhancement. The enhancement effect of plasmonic hybrids on the PL emission of MoS₂ has been systematically studied on MoS₂/Ag spherical nanoparticle (SP) hybrid systems with different architectures by changing the stacking position of Ag SPs. It is demonstrated that the sandwich-like hybrid composed of monolayer MoS₂ and dielectric Al₂O₃ layer between two layers of Ag SPs has the highest PL enhancement. Remarkably, after adding an Al₂O₃ layer under MoS₂, the PL intensity enhancement up to 209 times was achieved in the sandwich-like hybrid system. Compared with the hybrid with single-layer SPs, the sandwich-like hybrid system with double-layer Ag SPs exhibited an obvious blue shift as a result of the selective enhancement of the A⁰ exciton in MoS₂. These results demonstrate that MoS₂/Ag SP hybrid nanosystems have significant implications for sensing and photoelectronic devices.

Keywords: Al2O3 layer; MoS2; enhanced photoluminescence; localized surface plasmon resonance; plasmonic hybrid.