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首页> 外文期刊>Journal of Materials Science >Construction and characterization of tunable meso-/macroporous tungsten oxide-based transmissive electrochromic devices
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Construction and characterization of tunable meso-/macroporous tungsten oxide-based transmissive electrochromic devices

机译：可调谐的介孔/大孔氧化钨基透射电致变色器件的构建和表征

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Recent developments in the processing of porous transition metal oxide thin films have opened up new opportunities in the construction of electrochromic (EC) devices with enhanced properties. Tungsten oxide (WO3) is one of the most promising materials for EC devices. In this work, we report on the synthesis of meso-/macroporous WO3 thin films using tungstic acid as precursor and organically modified silane (ORMOSIL) as a templating agent. Calcination of the film at 500 °C resulted in nanocrystalline monoclinic tungsten oxide (m-WO3) with crystallite sizes of ~16 nm. The meso-/macroporous structure is retained after calcination. An asymmetric EC device based on the meso-/macroporous m-WO3 thin film was constructed. Thus constructed EC device was characterized by micro-Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction (XRD). Detailed micro-Raman and XRD studies of the intercalation and deintercalation of lithium (Li) in the meso-/macroporous m-WO3 layer of the EC device as a function of the applied voltage were performed. The meso-/macroporous WO3 layer, which was found to be monoclinic before Li intercalation, transforms to its higher symmetric phase of tetragonal and toward cubic phase when Li is intercalated into it. Upon complete deintercalation, these phase transitions were reversed and m-WO3 is recovered. Optical transmission studies were performed in conjunction with Raman and XRD studies. This study shows that meso-/macroporous m-WO3 layer-based EC device exhibit a high color contrast during the coloration and bleaching.
机译：多孔过渡金属氧化物薄膜加工的最新进展为构造性能增强的电致变色（EC）器件开辟了新的机遇。氧化钨（WO 3 ）是EC器件中最有前途的材料之一。在这项工作中，我们报道了使用钨酸作为前体和有机改性的硅烷（ORMOSIL）作为模板剂的介孔/大分子WO 3 薄膜的合成。薄膜在500°C下煅烧，得到纳米晶单斜氧化钨（m-WO 3 ），其晶粒尺寸约为16 nm。煅烧后，介孔/大孔结构得以保留。构造了基于介孔/大孔m-WO 3 薄膜的不对称EC器件。通过微拉曼光谱，扫描电子显微镜，透射电子显微镜和X射线衍射（XRD）表征如此构造的EC装置。进行了详细的拉曼和XRD研究，研究了EC器件的介孔/大孔m-WO 3 层中锂（Li）的嵌入和脱嵌随施加电压的变化。介孔/大孔的WO 3 层在Li插入之前被发现是单斜晶的，当Li插入其中时，转变为其较高的四方对称相，并转变为立方相。完全脱嵌后，这些相变被逆转，并且恢复了m-WO 3 。结合拉曼和XRD研究进行了光透射研究。这项研究表明，基于介孔/大孔的m-WO 3 层的EC器件在着色和漂白过程中表现出很高的色彩对比度。

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