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One-step selective formation of silver nanoparticles on atomic layered MoS2 by laser-induced defect engineering and photoreduction

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Abstract

Two dimensional (2D) materials decorated with noble metal nanoparticles (NPs) have attracted wide attention due to their appealing chemical and physical properties. Herein, we have developed a novel approach to controllable and selective decoration of silver NPs on atomic layered molybdenum disulfide (MoS2) by using one-step laser-induced defect engineering and photoreduction. By employing a focused micro-power laser beam, silver NPs can be rapidly (in seconds) anchored onto the irradiated area of MoS2 flakes, forming 0D/2D AgNPs@MoS2 heterostructures. The mechanism for silver growth on MoS2 flakes was based on laser-induced defect creation in a silver ion environment and silver nucleation on laser-excited MoS2 flake surfaces, as evidenced by a combination of techniques including Raman spectroscopy, atomic force microscopy and second-harmonic generation. We also found that the morphology and the growth rate of silver NPs are highly dependent on the layer thickness of MoS2 and the laser irradiation power; while the size and number density of silver NPs could be precisely controlled by varying the irradiation time as well as the silver ion concentration. Finally, AgNPs@MoS2 heterostructure micro-patterns have been successfully demonstrated via a programmed low-power laser scan, which shows great potential to be used as an efficient surface enhanced Raman scattering platform for chemical sensing.

Graphical abstract: One-step selective formation of silver nanoparticles on atomic layered MoS2 by laser-induced defect engineering and photoreduction

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Publication details

The article was received on 29 Apr 2017, accepted on 03 Aug 2017 and first published on 04 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC01863K
Citation: J. Mater. Chem. C, 2017, Advance Article
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    One-step selective formation of silver nanoparticles on atomic layered MoS2 by laser-induced defect engineering and photoreduction

    Y. T. Lei, D. W. Li, T. C. Zhang, X. Huang, L. Liu and Y. F. Lu, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC01863K

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