Nano Archive

Experimental observation of an extremely dark material made by a low-density nanotube array

Yang, Zu-Po and Ci, Lijie and Bur, James A. and Lin, Shawn-Yu and Ajayan, Pulickel M. (2008) Experimental observation of an extremely dark material made by a low-density nanotube array. NANO LETTERS, 8 (2). pp. 446-451.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl072369t

Abstract

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.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
ID Code:231
Deposited By:Lesley Tobin
Deposited On:18 Dec 2008 16:24
Last Modified:18 Feb 2009 17:18

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