折射率
聚合物
材料科学
索引(排版)
光电子学
生物色素
高分子科学
功能性聚合物
颜料
纳米技术
化学工程
复合材料
计算机科学
有机化学
共聚物
化学
万维网
工程类
作者
Mohammad Yasir,T. Phanindra Sai,Alba Sicher,Frank Scheffold,Ullrich Steiner,Bodo D. Wilts,Eric R. Dufresne
出处
期刊:Small
[Wiley]
日期:2021-09-23
卷期号:17 (44)
被引量:13
标识
DOI:10.1002/smll.202103061
摘要
Polymers are essential components of many nanostructured materials. However, the refractive indices of common polymers fall in a relatively narrow range between 1.4 and 1.6. Here, it is demonstrated that loading commercially-available polymers with large concentrations of a plant-based pigment can effectively enhance their refractive index. For polystyrene (PS) loaded with 67 w/w% β-carotene (BC), a peak value of 2.2 near the absorption edge at 531 nm is achieved, while maintaining values above 1.75 across longer wavelengths of the visible spectrum. Despite high pigment loadings, this blend maintains the thermoforming ability of PS, and BC remains molecularly dispersed. Similar results are demonstrated for the plant-derived polymer ethyl cellulose (EC). Since the refractive index enhancement is intimately connected to the introduction of strong absorption, it is best suited to applications where light travels short distances through the material, such as reflectors and nanophotonic systems. Enhanced reflectance from films is experimentally demonstrated, as large as sevenfold for EC at selected wavelengths. Theoretical calculations highlight that this simple strategy can significantly increase light scattering by nanoparticles and enhance the performance of Bragg reflectors.
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