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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Degradation of the optical properties of ZnO-based thermal control coatings in simulated space environment
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Degradation of the optical properties of ZnO-based thermal control coatings in simulated space environment

机译：ZnO基热控涂层在模拟空间环境中的光学性能下降

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Optical absorption and photoluminescence spectroscopy have been used to investigate the physical changes induced by proton and electron irradiation in selected thermal control coatings. This study focused on a white paint and on its two components, a polydimethylsiloxane resin and zinc oxide powder. Samples were irradiated by either 45 keV protons (fluence up to 10(16) protons cm(-2)) or 400 keV electrons (fluence up to 6 x 10(15) electrons cm(-2)). In situ reflectance measurements were made during the test and were complemented after air introduction by photoluminescence characterization. The optical properties of the paint are essentially those of the ZnO pigment. The optical degradation of the material appears to be correlated with the density of defects created by ionization in a zone close to the surface of the paint and called the optical thickness of the material. Two degradation regions of the reflectance properties in the wavelength range 250-2500 nm have been identified: one in the infrared and one in the visible blue region. The degradation in the IR region disappears on exposure to air so that no complementary technique could be used for identifying its origin. The point defects responsible for the optical degradation of the paint in the blue region are singly ionized oxygen vacancies (F+ centres) either initially present in the material or induced by irradiation. Irradiation quenches the green photoluminescence emission. The latter would be excited by the recombination of doubly ionized oxygen vacancies with photoformed electrons of the conduction band. [References: 25]
机译：光学吸收和光致发光光谱已用于研究质子和电子辐照在选定的热控涂层中引起的物理变化。这项研究的重点是白色涂料及其两种成分，即聚二甲基硅氧烷树脂和氧化锌粉末。用45 keV质子（通量达10（16）质子cm（-2））或400 keV电子（通量达6 x 10（15）电子cm（-2））辐照样品。在测试过程中进行了原位反射率测量，并在引入空气后通过光致发光特性进行了补充。涂料的光学性质基本上是ZnO颜料的光学性质。材料的光学降解似乎与在靠近油漆表面的区域中由电离产生的缺陷密度有关，称为材料的光学厚度。已经确定了在250-2500 nm波长范围内反射特性的两个退化区域：一个在红外区域，一个在可见蓝色区域。暴露于空气中后，IR区域中的降解消失，因此无法使用任何互补技术来确定其起源。导致涂料在蓝色区域发生光学降解的点缺陷是最初存在于材料中或由辐射引起的单离子化氧空位（F +中心）。辐照淬灭了绿色的光致发光发射。后者将通过双重电离的氧空位与导带的光形成电子的复合而被激发。 [参考：25]

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