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ZnS semiconductor nanoparticles with average size of 3.4nm were prepared in situ in chitosan film. TEM, UV–vis spectra and PL spectra show the ZnS nanoparticles in chitosan template were monodispersed and well passivated. The two-photon absorption coefficient (β) of the chitosan–ZnS quantum dots (QDs) nanocomposite film was obtained to be 2.29×10 2 cm/Gw from a standard Z-scan setup with femtosecond...
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