Experimental Observation of an Extremely Dark Material Made By a Low-Density Nanotube Array Yang, Zu-Po ; Ci, Lijie ; Bur, James A. ; Lin, Shawn-Yu ; Ajayan, Pulickel M. Abstract Publication: Nano Letters Pub Date: February 2008 DOI: 10.1021/nl072369t Bibcode: 2008NanoL...8..446Y