Journal
NANOTECHNOLOGY
Volume 27, Issue 41, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/27/41/414005
Keywords
WS2 quantum dots; ultra small; concentration; PMMA matrix; optical limiting
Funding
- National Natural Science Foundation of China [61575167]
- Hong Kong Polytechnic University [G-YBFR]
- Innovation and Technology Fund, Teaching Company Scheme [UIT/120, K-ZY72]
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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.
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