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Nano Research

Article Title

Emergence of photoluminescence on bulk MoS2 by laser thinning and gold particle decoration

Authors

Lili Gong, Department of Physics, National University of Singapore, Singapore 117542, Singapore
Qi Zhang, Department of Physics, National University of Singapore, Singapore 117542, Singapore
Liangjun Wang, Department of Physics, National University of Singapore, Singapore 117542, Singapore
Jianfeng Wu, Department of Physics, National University of Singapore, Singapore 117542, Singapore
Cheng Han, Department of Physics, National University of Singapore, Singapore 117542, Singapore
Bo Lei, Department of Physics, National University of Singapore, Singapore 117542, Singapore
Wei Chen, Department of Physics, National University of Singapore, Singapore 117542, Singapore Department of Chemistry, National University of Singapore, Singapore 117542, Singapore Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore
Goki Eda, Department of Physics, National University of Singapore, Singapore 117542, Singapore Department of Chemistry, National University of Singapore, Singapore 117542, Singapore Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore
Kuan Eng Johnson Goh, Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis, #08-03, Singapore 138634, Singapore Department of Physics, National University of Singapore, Singapore 117542, Singapore
Chorng Haur Sow, Department of Physics, National University of Singapore, Singapore 117542, Singapore Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore

Keywords

bulk MoS2, photoluminescence, laser thinning, gold particle, plasmonic effect, doping

Abstract

ABSTRACT We demonstrate a facile and effective approach to significantly improve the photoluminescence of bulk MoS2 via laser thinning followed by gold particle decoration. Upon laser thinning of exfoliated bulk MoS2, photoluminescence emerges from the laser-thinned region. After further treatment with an AuCl3 solution, gold particles self-assemble on the laser-thinned region and thick edges, further increasing the fluorescence of bulk MoS2 28 times and the Raman response 3 times. Such fluorescence enhancement can be attributed to both surface plasmon resonance and p-type doping induced by gold particles. The combination of laser thinning and AuCl3 treatment enables the functionalization of bulk MoS2 for optoelectronic applications. It can also provide a viable strategy for mask-free and area-selective p-type doping on single MoS2 flakes.

Graphical Abstract

Publisher

Tsinghua University Press

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