Large two-photon absorbance of chitosan–ZnS quantum dots nanocomposite film |
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| Authors: | Xiaohui Wang Yumin Du Sha Ding Lihong Fan Xiaowen Shi QuQuan Wang Guiguang Xiong |
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| Institution: | aCollege of Resource and Environmental Science, Wuhan University, Wuhan 430072, China;bDepartment of Physics, Wuhan University, Wuhan 430072, China;cCenter of Nanoscience & Nanotechnology Research, Wuhan University, Wuhan 430072, China |
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| Abstract: | ZnS semiconductor nanoparticles with average size of 3.4 nm 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 2.29×102 cm/Gw from a standard Z-scan setup with femtosecond laser pusles at 790 nm wavelength. Results show the novel biomacromolecule/QDs nanocomposite film has large third-order optical nonlinear absorption, the mechanism responsible for which was discussed. |
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| Keywords: | ZnS quantum dots Chitosan Two-photon absorption Z-scan |
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