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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.
Two-phase method was used to prepare gold nanoparticles modified by primary thiol and secondary cetyltrimethylammonium bromide (CTAB). Their structures and linear optics were characterized by transmission electron microscopy and UV-Vis absorption spectroscopy. Properties.An open-hole Z-scan technique was used to study the effect of surface modification on the nonlinear optical effect and optical limiting properties of gold nanoparticles under 532 nm wavelength.The results showed that the modification of secondary CTAB enhanced the effect of surface modification on the laser Irradiation of the local field and enhance the contribution of thermoelectrons to the nonlinear optical effect, thus effectively improving the light limiting properties of gold nanoparticles.