Large-Area Fabrication of Structurally Colored and Humidity Sensitive Composite Nanofilm via Ultrasonic Spray-Coating.
Large-Area Fabrication of Structurally Colored and Humidity Sensitive Composite Nanofilm via Ultrasonic Spray-Coating.
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通过超声波喷涂大面积制备结构着色和湿度敏感的复合纳米膜
DOI：
10.3390/polym13213768
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发表时间：
2021-10-30
期刊：
影响因子：
5
通讯作者：
Ma W
中科院分区：
文献类型：
--
作者：
Li S;Kou D;Zhang S;Ma W
智能结构色由于其广泛的应用，近年来受到了广泛的关注。然而，大面积、均匀且具有成本效益的超薄结构彩色薄膜的制造仍然具有挑战性。本文首次以无毒、绿色纳米二氧化硅和聚乙烯吡咯烷酮为原料，设计并采用超声喷涂技术在硅片上制备结构彩色薄膜。由于聚乙烯吡咯烷酮的加入，抑制了液滴干燥过程中的咖啡环效应，形成了均匀的复合膜。我们进一步进行了详细的研究，包括二氧化硅/聚乙烯吡咯烷酮浓度，基板温度，基板的距离，和数量的喷雾通过对膜的粗糙度和厚度的各种工艺参数的影响。通过将喷射通道的数量从10增加到30，膜厚度从120到340 nm被调制，导致不同的颜色，并且在直径为15 cm的商业圆形硅晶片上实现了大面积和均匀的颜色。二氧化硅/聚乙烯吡咯烷酮复合膜显示出很强的亲水性，对湿度变化敏感，导致快速可调和可逆的结构色。石英晶体微天平与耗散表明，当增加环境湿度时，水蒸气在纳米膜上吸附和冷凝。因此，超声喷涂作为一种新型的薄膜制备技术，为智能结构色的大面积制备提供了一种可行的方案。
Intelligent structural colors have received extensive attention in recent years due to their diverse applications. However, the large-area, uniform, and cost-effective fabrication of ultra-thin structural color films is still challenging. Here, for the first time, we design and employ an ultrasonic spray-coating technique with non-toxic, green nano-silica and polyvinylpyrrolidone as raw materials, to prepare structural color films on silicon wafers. Due to the addition of polyvinylpyrrolidone, the coffee-ring effect during droplet drying is suppressed and uniform composite films are formed. We further perform a detailed study of the influence of various processing parameters including silica/polyvinylpyrrolidone concentration, substrate temperature, nozzle-to-substrate distance, and number of spray-passes on film roughness and thickness. By increasing the number of spray-passes from 10 to 30, the film thickness from 120 to 340 nm is modulated, resulting in different colors, and large-area and uniform colors on commercial round silicon wafers with 15 cm diameter are achieved. The silica/polyvinylpyrrolidone composite films show strong hydrophilicity and are sensitive to humidity changes, leading to quickly tunable and reversible structural colors. Quartz crystal microbalance with dissipation demonstrates water vapor adsorption and condensation on the nanofilm when increasing environmental humidity. Thereby, ultrasonic spray-coating as a novel film fabrication technique provides a feasible scheme for large-area preparation of intelligent structural colors.
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影响因子：
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作者：
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通讯作者：
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