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半导体超微粒因其在光作用下产生局域浓度很高的载流子而导致显著的光发射和非线性光学响应,并且表面修饰能极大地改变半导体超微粒的这些特性。Fe_2O_3纳米微粒是一类重要的过渡金属半导体材料。文献报道表面包覆的Fe_2O_3纳米微粒溶胶具有较大的三阶非线性极化率,而未见有关稀土RE~（3+）掺杂的 Fe_2O_3纳米微粒溶胶的研究报道。本文采用胶体化学法首次制备了用DBS（十二烷基苯磺酸钠）包覆其表面的稀土RE~（3+）（RE=Ce,Pr,Sm,Tb）掺于Fe_2O_3晶格内的纳米微粒溶胶和附着于Fe_2O_3表面的纳米微粒溶胶。研究了它们与表面包覆的和裸的 Fe_2O_3纳米微粒以及体Fe_2O_3吸收光谱的差异。在Ar~+ 488nm激光的作用下,采用Z-scan技术对上述四种纳米微粒的非线性光学特性进行研究。结果表明,与表面包覆的Fe_2O_3纳米微粒溶胶相比,表面包覆的稀土离子掺杂于Fe_2O_3晶格内的纳米微粒溶胶其三阶
Semiconductor ultra-fine particles result in significant light emission and nonlinear optical response due to the generation of carriers with high local concentration under the action of light, and the surface modification can greatly change these characteristics of the semiconductor ultrafine particles. Fe 2 O 3 nanoparticles are a class of important transition metal semiconductor materials. It has been reported in the literature that the surface-coated Fe 2 O 3 nanoparticle sol has a large third-order nonlinear polarizability without any reports on the RE 3+ -doped Fe 2 O 3 nanoparticle sol. In this paper, the RE (3 +) (RE = Ce, Pr, Sm, Tb) doped with DBS (sodium dodecylbenzenesulfonate) on the surface of Fe_2O_3 crystal lattice Nanoparticle sol and nanoparticle sol attached to the surface of Fe_2O_3. The differences between them and the surface-coated and bare Fe 2 O 3 nanoparticles and their bulk Fe 2 O 3 absorption spectra were studied. Under the action of Ar ~ +488 nm laser, the nonlinear optical properties of the above four kinds of nanoparticles were studied by Z-scan technology. The results show that compared with the surface-coated Fe 2 O 3 nanoparticle sol, the surface-coated rare earth ions are doped into the nanoparticle sol in the Fe 2 O 3 crystal lattice with the third order