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Indium tin oxide (ITO) layers are prepared on polymethylmethacrylate and polyethylene terephthalate by rf- magnetron sputtering at room temperature. Their 3D-AFM images and visible transmittance spectra are contrastively characterized and studied. An interesting morphological effect of the polymer substrates on their top ITO layers is observed. Dominant direct and indirect transition types deduced from optical spectra are surprisingly found in ITO films on different polymers. Furthermore, qualitative band structures are figured, and some theoretical discussions about the correlation of optical band structure, interface/surface morphology and carrier density are also presented.  相似文献   
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聚苯胺衍生物电致变色薄膜的制备与物性研究   总被引:1,自引:0,他引:1  
采用循环伏安电化学沉积方式分别制备了聚邻甲氧基苯胺(1)和聚邻甲氧基苯胺/邻硝基苯胺(2)电致变色薄膜,并通过UV-Vis、分光光度仪、场发射扫描电子显微镜(SEM)对其进行性能表征.结果显示:变色膜1在不同电压下能实现湖绿色(U=-0.5V)和淡紫色(U=0.9V)变化,响应时间约15s,最大透光率变化(△Tmax)约10%(500nm);变色膜2在不同电压下能实现橄榄绿色(U=-0.9V)和深酞蓝色(U=1.4V)变化,响应时间约2s,最大透光率变化(△Tmax)约为20%(497nm);SEM测试得到薄膜2的厚度约550nm,且不同颜色状态下其表面形貌及导电性能有较大的差别.由以上结果可以看出:电致变色薄膜2比1具有更快的响应速度和较好的颜色对比度,因此薄膜2是更好的电致变色材料.  相似文献   
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The infrared emissivity of low emissivity coating can be significantly reduced by adding high content concentrations of parallel distributed metallic flake pigment. However, the infrared emissivity is very difficult to calculate by the existing theory models, such as the light scattering theory and traditional Kubelka-Munk radiative transfer model, because of shape and distribution anisotropy of flake pigments. Thus, the low emissivity coating is assumed to be the superposition structure of homogeneous layers and metallic flakes are approximately uniform and parallel arrangement in each layer. Based on geometric optics theory and Kubelka's layer model, considering multiple reflection, transmission and absorption of infrared radiation among different layers, the theoretical model is established to calculate the coating emissivity. The facts of binder, pigment concentration and thickness are also systematic discussed. The result shows that the law of influence on infrared emissivity can be correctly simulated by this theoretical model. Transparent binder, high volume concentration of thin flake pigment can facilitate to reduce infrared emissivity. Moreover, this model offers the possibility of predicting the infrared optical properties of coatings by their optical constants.  相似文献   
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