Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/66564
Title: The WS2 quantum dot : preparation, characterization and its optical limiting effect in polymethylmethacrylate
Authors: Long, H
Tao, LL
Chiu, CP
Tang, CY
Fung, KH 
Chai, Y 
Tsang, YH 
Keywords: WS2 quantum dots
Ultra small
Concentration
PMMA matrix
Optical limiting
Issue Date: 2016
Publisher: Institute of Physics Publishing
Source: Nanotechnology, 14 Oct. 2016, v. 27, no. 41, 414005 How to cite?
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 (beta) with respect to a higher concentration of embedded WS2 QDs into the PMMA solid state matrix for both 532 and 1064 nm.
URI: http://hdl.handle.net/10397/66564
ISSN: 0957-4484
EISSN: 1361-6528
DOI: 10.1088/0957-4484/27/41/414005
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