The unique properties of carbon nanotubes (CNTs) allow them to be used in various optical applications, such as ultra-dark surfaces, bolometers, metamaterial cloaks, and anisotropic absorbers. In particular, organization of CNTs with controlled density at the sub-micrometer scale could enable new strategies to engineer optically active surfaces. Here, we present a new strategy to engineer the density-dependent optical properties of CNT forests by patterning of catalyst film via nanoimprint lithography (NIL) followed by atmospheric pressure chemical vapor deposition (CVD) synthesis of CNTs. Via this approach, we demonstrate atmospheric pressure growth of CNT structures with widths of 80–350 nm. These structures form self-supporting arrays with height exceeding 500 μm, representing aspect ratios well over 1000:1. Optical attenuation measurement places the density of NIL patterned forests to be a fraction of the density of unpatterned CNT forests, confirming that the CNT density is effectively controlled by the catalyst coverage. The infrared absorbance measurements corroborate the density control, and Kramers-Kronig analysis shows that the refractive indices of the NIL patterned CNT forests are tunable in the range of 1–1.8.
Bibliographical noteFunding Information:
Financial support to S.J.P. and A.J.H. were provided by DARPA ( HR0011-10-C-0192 ). Support from DARPA was received under Agreement to NextGen Aeronautics, and any opinions, findings, and conclusions or recommendations expressed in this material do not necessarily reflect the views of NextGen Aeronautics and/or DARPA. J.G.O. acknowledges the support by the National Research Foundation (NRF) grants funded by the Korean Government Ministry of Science, ICT & Future Planning (MISP) (No. 2015R1A5A1037668 and No. 2016R1C1B2016182 ) and Samsung Display, Co., Ltd .
All Science Journal Classification (ASJC) codes
- Materials Science(all)