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Title: Wafer-scale vertically aligned carbon nanotubes for broadband terahertz wave absorption
Authors: Sun, Leimeng
Zhu, Minmin
Zhao, Chun
Song, Peiyi
Wang, Yurong
Xiao, Dongyang
Liu, Huafeng
Tsang, Siu Hon
Teo, Edwin Hang Tong
Hu, Fangjing
Tu, Liangcheng
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Sun, L., Zhu, M., Zhao, C., Song, P., Wang, Y., Xiao, D., Liu, H., Tsang, S. H., Teo, E. H. T., Hu, F. & Tu, L. (2019). Wafer-scale vertically aligned carbon nanotubes for broadband terahertz wave absorption. Carbon, 154, 503-509.
Journal: Carbon
Abstract: Materials with high and broadband absorption characteristics in the terahertz (THz) range are desirable for many applications. In this paper, we propose, fabricate and experimentally demonstrated a wafer-scale vertically aligned carbon nanotube (VACNT) array for broadband THz wave absorption. The effects of VACNT parameters on the absorption performance are investigated within the THz and infrared spectra using the Maxwell-Garnett theory, revealing that the absorption in the THz range can be greatly enhanced by suitable selections of the length, volume fraction and vertical alignment factor of CNTs. A VACNT array with an average CNT length of ∼600 μm is fabricated on a 4-inch silicon substrate. Experimental results measured by a THz time-domain spectroscopic system show an average power absorptance of ∼98% from 0.3 to 2.5 THz, and agree well with the numerical modelling. This device can be used as a cost-effective near-perfect absorber across the THz and infrared regions for thermal emission and imaging, electromagnetic interference shielding, stealth and energy harvesting applications.
ISSN: 0008-6223
DOI: 10.1016/j.carbon.2019.08.001
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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