Chin. Phys. Lett.  2020, Vol. 37 Issue (4): 045201    DOI: 10.1088/0256-307X/37/4/045201
 PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
Tunable Dielectric Properties of Carbon Nanotube@Polypyrrole Core-Shell Hybrids by the Shell Thickness for Electromagnetic Wave Absorption
De-Ting Wang, Xian-Chao Wang, Xiao Zhang, Hao-Ran Yuan, Yu-Jin Chen**
Key Laboratory of In-Fiber Integrated Optics (Ministry of Education), and College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001
De-Ting Wang, Xian-Chao Wang, Xiao Zhang et al  2020 Chin. Phys. Lett. 37 045201
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Abstract Carbon nanotube@polypyrrole (CNT@PPy) hybrids have been successfully fabricated via a simple in situ chemical oxidation polymerization. The thickness of the PPy shell can be finely controlled in the range of 3.0–6.4 nm. The dielectric loss of core-shell hybrids can be tuned by the shell thickness, resulting in a well-matched characteristic impedance that can enhance electromagnetic wave (EMW) absorption performance. Minimum reflection loss of the hybrid with moderate PPy shell thickness can reach $-51.4$ dB at 11.8 GHz with a matching thickness of merely 2 mm. Furthermore, the minimum reflection loss values of the hybrid are below $-30$ dB even at thickness in the range of 1.4–1.9 mm, endowing the possibility of practical application of the hybrids in electromagnetic wave absorption field.
Received: 02 January 2020      Published: 24 March 2020
 PACS: 52.70.Gw (Radio-frequency and microwave measurements) 52.70.Ds (Electric and magnetic measurements) 77.84.Lf (Composite materials) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
Fund: Supported by the National Natural Science Foundation of China under Grant No. 51972077, and the Heilongjiang Touyan Innovation Team Program.
 TRENDMD: URL: http://cpl.iphy.ac.cn/10.1088/0256-307X/37/4/045201       OR      http://cpl.iphy.ac.cn/Y2020/V37/I4/045201