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.
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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第5期221-227,共7页
Acta Physica Sinica
基金
国家自然科学基金(批准号:51172045/E0207)
高校博士点基金(批准号:20113514120006)资助的课题~~
关键词
金纳米颗粒
表面修饰
Z扫描
gold nanoparticles
surface modification
Z-scan measurement
