摘要
采用原位复合的方法制备出厚度为20μm的聚乙烯醇(PVA)与ZnS纳米微粒复合的薄膜,利用透射电镜(TEM)和X射线衍射(XRD)研究薄膜样品的微结构性能,证明已制备出立方晶相的针状ZnS纳米晶.用Z-扫描技术研究ZnS/PVA纳米复合薄膜的非线性光学性质,发现该薄膜对532 nm纳秒脉冲激光表现出较强的非线性吸收效应,而且非线性吸收强度随入射光强的增加而减少.该非线性吸收主要由纳米ZnS的三光子吸收引起,并伴随弱饱和吸收现象发生.
ZnS / Polyvinyl alcohol （PVA） nano - composite film was synthesized by in - situ synthesis method. The micro - structure of the film was characterized by X - ray diffraction （XRD） and transmission electron microscopy （TEM）. It is found that the synthesized nanocrystallines within the film was cubic β - ZnS in needle- like shape, its average length, diameter and aspect ratio are about 36 nm, 6 nm and 6, respectively. Its maximum ultra - violet absorption peak has a ＂blue shift＂ to 235.6 nm. The optical property of the composite film was investigated by using Z scanning optical instrument in the case of 532 nm, 16 ns pulses of second - harmonic radiation of Nd ： YAG laser, the results indicate that the synthesized ZnS nanoparticals show nonlinear three -photon absorbing optical effect, and the absorbing intensity decreases with the increasing of incident laser intensity.
出处
《安徽大学学报（自然科学版）》
CAS
北大核心
2006年第5期56-60,共5页
Journal of Anhui University(Natural Science Edition)
基金
安徽省科技厅重点科研基金资助项目(04022075)
南京大学固体微结构物理国家重点实验室开放基金资助项目(M031803)
关键词
纳米ZNS
三光子吸收
Z-扫描
ZnS nanoparticals
three - photon absorbing
Z scanning
