Effect of laser illumination on the morphology and optical property of few-layer MoS2nanosheet in NMP and PMMA

Hui Long, Lili Tao, Chun Yin Tang, Hwa Yaw Tam, Qiao Wen, Yuen Hong Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

Two-dimensional (2D) materials and laser interaction is a very important research topic due to the unique properties of 2D materials, making them a promising candidate for high-power applications such as optical limiters and saturable absorbers for mode locking laser generation. In this paper, we have analysed the morphology and optical property changes of few-layer molybdenum disulfide (MoS2) nanosheet in NMP solution under the illumination of a Q-switched laser with operational wavelength of 532 and 1064 nm with respect to various laser energy densities. The experimental results show significant changes caused by the oxidization of MoS2into molybdenum oxide (MoO3). Due to the stronger absorption in the visible range, the 532 nm wavelength has a stronger oxidization effect than the 1064 nm illumination wavelength. The nonlinear optical absorption properties of MoS2in liquid NMP and in solid PMMA have been studied by using the z-scan technique and the results are compared. It has been shown experimentally that the nonlinear optical absorption properties of MoS2in NMP disappeared but without changes in MoS2/PMMA composites after laser illumination. This confirms that MoS2is much more stable within PMMA for preserving nonlinear absorption properties under high laser density illumination.
Original languageEnglish
Pages (from-to)678-683
Number of pages6
JournalJournal of Materials Chemistry C
Volume4
Issue number4
DOIs
Publication statusPublished - 1 Dec 2015

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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