The WS2 quantum dot: preparation, characterization and its optical limiting effect in polymethylmethacrylate. (8th September 2016)

• Record Type: Journal Article
• Authors: Long, Hui; Tao, Lili; Chiu, Chun Pang; Tang, Chun Yin; Fung, Kin Hung; Chai, Yang; Tsang, Yuen Hong
• Is Part Of: Nanotechnology. Volume 27:Number 41(2016)
• Publication Date: 2016-09-08
• Subjects: WS2 quantum dots -- ultra small -- concentration -- PMMA matrix -- optical limiting; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/27/41/414005
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Due to the matching surface energy, WS2 quantum dots (QDs) can be obtained through direct liquid exfoliation in N-methyl-2-pyrrolidone rather than an ethanol and water mixture. Ultra-small WS2 QDs 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 WS2 QD/ polymethylmethacrylate (PMMA) composite for the nanosecond pulsed laser at both 532 and 1064 nm has been measured. Results illustrate the lower onset thresholds ( F ON ), lower optical limiting thresholds ( F OL ), and higher two-photon absorption coefficient ( β ) with respect to a higher concentration of embedded WS2 QDs into the PMMA solid state matrix for both 532 and 1064 nm.