Thin randomly aligned hierarchical carbon nanotube arrays as ultrablack metamaterials

Article

关键词: OPTICAL-PROPERTIES;    PYROELECTRIC DETECTORS;    BLACK SURFACES;    SOLAR-CELLS;    COATINGS;    ABSORPTION;    EFFICIENCY;    FILMS;    NANOSTRUCTURES;    ABSORBER;   

DOI  :  10.1103/PhysRevB.96.045409

来源: SCIE

【 摘 要 】

Ultrablack metamaterials are artificial materials able to harvest all the incident light regardless of wavelength, angle, or polarization. Here, we show the ultrablack properties of randomly aligned hierarchical carbon nanotube arrays with thicknesses below 200 nm. The thin coatings are realized by solution processing and dry-transfer deposition on different substrates. The hierarchical surface morphology of the coatings is biomimetic and provides a large effective area that improves the film optical absorption. Also, such a morphology is responsible for the moth-eye effect, which leads to the omnidirectional and polarization-independent suppression of optical reflection. The films exhibit an emissivity up to 99.36% typical of an ideal black body, resulting in the thinnest ultrablack metamaterial ever reported. Such a material may be exploited for thermal, optical, and optoelectronic devices such as heat sinks, optical shields, solar cells, light and thermal sensors, and light-emitting diodes.

【 授权许可】

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