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首页> 外文期刊>Applied Surface Science >Crystalline WO_3 nanowires array sheathed with sputtered amorphous shells for enhanced electrochromic performance
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Crystalline WO_3 nanowires array sheathed with sputtered amorphous shells for enhanced electrochromic performance

机译：结晶WO_3纳米线阵列包覆有溅射的无定形壳，可增强电致变色性能

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摘要

Rational construction of crystalline/amorphous tungsten trioxide core/shell nanowire arrays have been obtained by combing solvothermal and magnetron sputtering techniques. High resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) characterization results reveal that the core/shell nanowires are composed of single crystal hexagonal tungsten trioxide nanocores sheathed with amorphous tungsten trioxide nanoshells. By the well-controlled sputtering technique, the thickness of the amorphous WO3 nanoshell can be precisely modulated which determines evidently electrochromic properties of the core/shell nanostructure. The optimized core/shell nanowires display exceptional electrochromic properties of high optical contrast (84.5% at 633 nm and 80.0% at 1500 nm), fast switching speeds (1.2 s for bleaching and 3.6 s for coloring), high coloration efficiency (83.6 cm(2)/C at 633 nm) and exceptional cycle stability (91.9% after 3000 cycles). The enhanced performance can be attributed to the complementary advantages of the crystalline nanocores and the well-defined amorphous nanoshells as well as their interface interaction. The strategy of synthesizing crystalline/amorphous core-shell nanoarrays proposes a reliable solution to produce high performance electrochromic materials and devices such as energy saving smart window, outdoor static displays and other energy-efficient applications.
机译：通过结合溶剂热和磁控溅射技术已经获得了晶体/非晶态三氧化钨核/壳纳米线阵列的合理构造。高分辨率透射电子显微镜（HRTEM）和X射线衍射（XRD）表征结果表明，核/壳纳米线由包覆有非晶态三氧化钨纳米壳的单晶六角形三氧化钨纳米核组成。通过良好控制的溅射技术，可以精确地调节非晶态WO3纳米壳的厚度，这显然决定了核/壳纳米结构的电致变色特性。经过优化的核/壳纳米线显示出​​卓越的电致变色特性，具有高光学对比度（633 nm时为84.5％，1500 nm时为80.0％），快速切换速度（用于漂白的时间为1.2 s，用于着色的时间为3.6 s），高着色效率（83.6 cm（ 2）/ C（在633 nm下）和出色的循环稳定性（3000次循环后为91.9％）。增强的性能可归因于结晶纳米核和定义明确的非晶纳米壳的互补优势，以及它们之间的界面相互作用。合成晶体/非晶核-壳纳米阵列的策略提出了一种可靠的解决方案，可用于生产高性能电致变色材料和设备，例如节能智能窗，户外静态显示器和其他节能应用。

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