Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 8-14 |
| Number of pages | 7 |
| Journal | Carbon |
| Volume | 129 |
| DOIs | |
| Publication status | Published - 2018 Apr 1 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Science(all)
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Modulation of the effective density and refractive index of carbon nanotube forests via nanoimprint lithography. / Park, Sei Jin; Ok, Jong G.; Park, Hui Joon; Lee, Kyu Tae; Lee, Jae Hyuk; Kim, Jeong Dae; Cho, Eikhyun; Baac, Hyoung Won; Kang, Shinill; Guo, L. Jay; Hart, A. John.
In: Carbon, Vol. 129, 01.04.2018, p. 8-14.Research output: Contribution to journal › Article
TY - JOUR
T1 - Modulation of the effective density and refractive index of carbon nanotube forests via nanoimprint lithography
AU - Park, Sei Jin
AU - Ok, Jong G.
AU - Park, Hui Joon
AU - Lee, Kyu Tae
AU - Lee, Jae Hyuk
AU - Kim, Jeong Dae
AU - Cho, Eikhyun
AU - Baac, Hyoung Won
AU - Kang, Shinill
AU - Guo, L. Jay
AU - Hart, A. John
PY - 2018/4/1
Y1 - 2018/4/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.carbon.2017.11.079
DO - 10.1016/j.carbon.2017.11.079
M3 - Article
AN - SCOPUS:85036648288
VL - 129
SP - 8
EP - 14
JO - Carbon
JF - Carbon
SN - 0008-6223
ER -