The WS2quantum dot: Preparation, characterization and its optical limiting effect in polymethylmethacrylate

Hui Long, Lili Tao, Chun Pang Chiu, Chun Yin Tang, Kin Hung Fung, Yang Chai, Yuen Hong Tsang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)


� 2016 IOP Publishing Ltd. Due to the matching surface energy, WS2quantum dots (QDs) can be obtained through direct liquid exfoliation in N-methyl-2-pyrrolidone rather than an ethanol and water mixture. Ultra-small WS2QDs with a diameter of 2.4 nm are fabricated by an ultrasound method followed by high speed centrifugation up to 10 000 rpm. An excellent nonlinear optical (NLO) property of the WS2QD/ polymethylmethacrylate (PMMA) composite for the nanosecond pulsed laser at both 532 and 1064 nm has been measured. Results illustrate the lower onset thresholds (FON), lower optical limiting thresholds (FOL), and higher two-photon absorption coefficient (β) with respect to a higher concentration of embedded WS2QDs into the PMMA solid state matrix for both 532 and 1064 nm.
Original languageEnglish
Article number414005
Issue number41
Publication statusPublished - 8 Sep 2016


  • concentration
  • optical limiting
  • PMMA matrix
  • ultra small
  • WS quantum dots 2

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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