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首页> 外文期刊>Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion >Nanoparticles of TiO_2 and VO_2 in dielectric media: Conditions for low optical scattering, and comparison between effective medium and four-flux theories
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Nanoparticles of TiO_2 and VO_2 in dielectric media: Conditions for low optical scattering, and comparison between effective medium and four-flux theories

机译：介电介质中TiO_2和VO_2的纳米粒子：低光散射的条件以及有效介质和四通量理论的比较

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摘要

Spectral transmittance and reflectance in the 300-2500 nm solar-optical wavelength range were calculated for nanoparticles of titanium dioxide and vanadium dioxide with radii between 5 and 100 nm embedded in transparent dielectric media. Both of the materials are of large importance in green nanotechnologies: thus TiO_2 is a photocatalyst that can be applied as a porous film or a nanoparticle composite on indoor or outdoor surfaces for environmental remediation, and VO_2 is a thermochromic material with applications to energy-efficient fenestration. The optical properties, including scattering, of the nanoparticle composites were computed from the Maxwell-Garnett effective-medium theory as well as from a four-flux radiative transfer model. Predictions from these theories approach one another in the limit of small particles and in the absence of optical interference. Effects of light scattering can be modeled only by the four-flux theory, though. We found that nanoparticle radii should be less than ~20 nm in order to avoid pronounced light scattering.
机译：计算了嵌入在透明电介质中的二氧化钛和二氧化钒的纳米粒子，其半径在5到100 nm之间，在300-2500 nm太阳光波长范围内的光谱透射率和反射率。两种材料在绿色纳米技术中都具有重要意义：因此TiO_2是一种光催化剂，可以作为多孔膜或纳米颗粒复合物应用于室内或室外表面，以进行环境修复; VO_2是一种热致变色材料，可提高能源效率。开窗。纳米颗粒复合材料的光学特性（包括散射）是根据Maxwell-Garnett有效介质理论以及四通量辐射传递模型计算得出的。这些理论的预测在小颗粒的限制和没有光学干扰的情况下彼此接近。但是，只能通过四通量理论来模拟光散射的影响。我们发现纳米粒子半径应小于〜20 nm，以避免明显的光散射。

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