Experimental observation of an extremely dark material made by a low-density nanotube array
Experimental observation of an extremely dark material made by a low-density nanotube array
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DOI：
10.1021/nl072369t
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发表时间：
2008-02-01
期刊：
影响因子：
10.8
通讯作者：
Ajayan, Pulickel M.
中科院分区：
文献类型：
--
作者：
Yang, Zu-Po;Ci, Lijie;Ajayan, Pulickel M.
理想的黑色材料在所有角度和所有波长上都能完美地吸收光线。在这里，我们展示了低密度垂直排列的碳纳米管阵列可以被设计成具有极低的折射率，正如最近理论所预测的那样(加西亚-维达尔，F.J.；皮塔克，J.M.；彭德里，J.B.Phys)。莱夫牧师。并且，与阵列的纳米级表面粗糙度相结合，可以产生近乎完美的光学吸收材料。从这种阵列测得的超低漫反射比为1×10(-7)，比商业低反射标准碳低一个数量级。相应的纳米管阵列的综合总反射率为0.045%，比迄今报道的任何材料的光学反射率最低值低三倍，使其成为有史以来最暗的人造材料。
An ideal black material absorbs light perfectly at all angles and over all wavelengths. Here, we show that low-density vertically aligned carbon nanotube arrays can be engineered to have an extremely low index of refraction, as predicted recently by theory (Garcia-Vidal, F. J.; Pitarke, J. M.; Pendry, J. B. Phys. Rev. Leff. 1997, 78, 42894292] and, combined with the nanoscale surface roughness of the arrays, can produce a near-perfect optical absorption material. An ultralow diffused reflectance of 1 X 10(-7) measured from such arrays is an order-of-magnitude lower compared to commercial low-reflectance standard carbon. The corresponding integrated total reflectance of 0.045% from the nanotube arrays is three times lower than the lowest-ever reported values of optical reflectance from any material, making it the darkest man-made material ever.