PbS–polymer nanocomposite with third-order nonlinear optical response in femtosecond regime

A new method is developed using polymerized bicontinuous microemulsions to synthesize PbS–polymer nanocomposite having large nonlinear optical response. Besides a polymeric nonionic surfactant, ω-methoxy poly(ethylene oxide) 40 undecyl-α-methacrylate (C 1-PEO-C 11-MA-40), a system consisting of meth...

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Bibliographic Details
Published in:Materials letters 2001-12, Vol.51 (6), p.461-469
Main Authors: Liu, Bing, Li, Heping, Chew, Chwee Har, Que, Wenxiu, Lam, Yee Loy, Kam, Chan Hin, Gan, Leong Ming, Xu, Guo Qin
Format: Article
Language:English
Subjects:
Applied sciences
Composites
Exact sciences and technology
Forms of application and semi-finished materials
HRTEM
Microemulsion
Nanocomposite
Nonlinearity
PbS
Polymer industry, paints, wood
Polymerisation
Technology of polymers
Z-scan
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Summary:A new method is developed using polymerized bicontinuous microemulsions to synthesize PbS–polymer nanocomposite having large nonlinear optical response. Besides a polymeric nonionic surfactant, ω-methoxy poly(ethylene oxide) 40 undecyl-α-methacrylate (C 1-PEO-C 11-MA-40), a system consisting of methyl methacrylate (MMA), acronitrile (AN), ethylene glycol dimethacrylate (EGDMA), aqueous solutions of Pb(NO 3) 2/thioacetamide (TAA) was selected. High-resolution transmission electron microscopy (HRTEM) results indicated PbS nanocrystals with a width of 5 nm and a cubic structure is formed in water domains. A single-beam Z-scan measurement showed that the nanocomposite polymer has a nonresonant and negative nonlinear refractive index ( γ) of 6.8×10 −12 cm 2/W at 780 nm. The origin of the large nonlinear optical response based on the contribution of surface recombination owing to high surface-to-volume ratios of PbS nanoparticles to the optical nonlinearity is discussed.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(01)00336-6