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Chromogenic Amorphous MoO3–x Nanosheets and Their Nanostructured Films for Smart Window Applications
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-09-01 , DOI: 10.1021/acsanm.1c01428
Masahito Morita 1 , Satoshi Toyoda 2 , Hisao Kiuchi 1 , Takeshi Abe 3 , Kazuhiro Kumagai 4 , Takahiro Saida 5 , Katsutoshi Fukuda 1
Affiliation  

Amorphous molybdenum trioxide (a-MoO3–x) nanosheets of approximately 1.5 nm thickness were synthesized via pseudo-topotactic reactions of two-dimensional MoO2 nanosheets obtained soft-chemically from the exfoliation of layered sodium molybdate, Na0.9Mo2O4. The topotactic phase transformation from the as-grown MoO2 nanosheets to crystalline MoO3–x nanosheets was triggered by a facile calcination at 200 °C in air. Amorphization without significant changes in the sheet structure occurred at 250 °C, yielding a-MoO3–x nanosheets. Among the products, a monolayer film of the a-MoO3–x nanosheets had superior photochromic properties in the visible and infrared ranges via band-gap excitation compared to conventional thin films composed of MoO3-related materials in terms of coloration efficiency, that is, degree of coloration per thickness. The coloration efficiency of the a-MoO3–x nanostructured films fabricated in this study remained unchanged despite an increase in the stacking number of the precursor nanosheets because the amorphous structure inhibited the recombination of electron–hole pairs; moreover, the multilayer structure had interlayer galleries between the nanosheets. Consequently, the thick film comprising layers with a similar a-MoO3–x nanostructure exhibited a remarkable degree of coloration and repeatability of coloration and bleaching cycles, indicating its potential for smart window applications.

中文翻译:

用于智能窗应用的显色无定形 MoO3-x 纳米片及其纳米结构薄膜

大约 1.5 nm 厚的无定形三氧化钼 (a-MoO 3– x ) 纳米片是通过从层状钼酸钠 Na 0.9 Mo 2 O 4的剥离以软化学方式获得的二维 MoO 2纳米片的拟拓扑反应合成的。从生长的 MoO 2纳米片到结晶 MoO 3- x纳米片的拓扑相变是通过在空气中 200 °C 的简单煅烧触发的。在 250 °C 时发生无片结构显着变化的非晶化,产生 a-MoO 3 - x纳米片。在这些产品中,a-MoO 3–的单层膜与由 MoO 3相关材料组成的传统薄膜相比, x纳米片通过带隙激发在可见光和红外范围内具有优异的光致变色性能,在着色效率方面,即每厚度的着色程度。尽管前体纳米片的堆叠数量增加,但本研究中制备的 a-MoO 3- x纳米结构薄膜的着色效率保持不变,因为无定形结构抑制了电子 - 空穴对的复合。此外,多层结构在纳米片之间具有层间通道。因此,厚膜包含具有类似 a-MoO 3– x 的层 纳米结构表现出显着程度的着色以及着色和漂白循环的可重复性,表明其在智能窗户应用中的潜力。
更新日期:2021-09-24
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