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表面修饰基团对金纳米颗粒非线性光学效应的影响研究
Effects of surface modification on nonlinear optical performance of gold nanoparticles
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摘要: 采用两相法分别制备一级硫醇修饰和二级十六烷基三甲基溴化铵（CTAB）修饰的金纳米颗粒,通过透射电子显微镜和紫外-可见吸收光谱表征了其结构和线性光学性质.采用开孔Z扫描技术,研究表面修饰对金纳米颗粒在532 nm波长激光作用下的非线性光学效应及光限幅性能的影响行为.结果表明,二级CTAB的修饰增强了颗粒在激光照射下的局域场作用,并提高了热电子对非线性光学效应的贡献程度,从而有效地提高了金纳米颗粒的光限幅性能.Abstract: Two kinds of gold nanoparticles with different surface-capping groups （Au-DT and Au-DT-CTAB）, 1-dodecanthiol and cetyltrimethylammonium bromide （CTAB） are prepared by a two-phase method. Structures and linear optical properties of the mate- rials are characterized using transmission electron microscopy and ultraviolet-visible absorption spectroscopy. The effects of surface modification on nonlinear optical （NLO） performance and optical limiting behavior of gold nanoparticles are investigated using the open Z-scan technique at a laser wavelength of 532 nm. The results show that Au-DT-CTAB shows an enhanced NLO effect in com- parison with Au-DT. The secondary modification with CTAB can not only improve local field enhancement effect but also make the contribution of thermoelectrons to NLO performance of gold nanoparticles on laser irradiation.
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