柔性透明薄膜掺杂微纳米粒子的光谱特性研究

Research on Spectral Characteristics of the Flexible Transparent Films Doped with Micro Particles

柔性材料因杨氏模量较小,在外力作用下易变形而受到广泛研究和应用。聚二甲基硅氧烷(PDMS)是一种高分子聚合物,并且具有光学透明、化学惰性等特点。Ni在0.32μm具有高吸收性,Al2O3在0.40.8μm具有高反射性。提出将微纳米Ni或Al2O3粒子掺杂到PDMS薄膜中的结构,先利用米氏散射理论计算出单个粒子的辐射特性,再利用蒙特卡洛方法求解整个模型的辐射特性。研究发现,薄膜模型的光谱特性受粒径影响:当波长不变时,掺杂Ni粒子的模型的吸收率与粒子浓度和膜厚成正比;掺杂Al2O3粒子的模型的反射率与粒子浓度和膜厚成正比;2种模型的透射率均与粒子浓度和膜厚成反比。最后根据布格尔定律推出的关系式证明了光谱特性变化的机理。

The flexible material whose Young′s modulus is small has been widely researched and applied in many fields. It is easy to deform under the external forces. Polydimethylsiloxane(PDMS) is a high polymer having the characteristics of optical transparency and chemical inertia. Ni has high absorptivity, Al2O3 has high reflectivity. The PDMS film doped with micro Ni or Al2O3 particles was proposed. Mie scattering theory was applied to calculate the radiation characteristics of a single particle, and the Monte Carlo method was used to simulate the radiation characteristics of the whole model. It can be seen that the size of the particle has influence on the spectral characteristics of the film. If the wavelength was constant, the absorptivity of the Ni-doped film and the reflectivity of the Al2O3-doped film were proportional to the film thickness and the volume fraction of the particles, and the transmissivity of both films was inversely proportional to the film thickness or the volume fraction of the particles. Finally, the rules of the spectral characteristics of the films doped with micro particles was verified by the relation derived from bouguer′s law.