%A De-Ting Wang, Xian-Chao Wang, Xiao Zhang, Hao-Ran Yuan, Yu-Jin Chen %T Tunable Dielectric Properties of Carbon Nanotube@Polypyrrole Core-Shell Hybrids by the Shell Thickness for Electromagnetic Wave Absorption %0 Journal Article %D 2020 %J Chin. Phys. Lett. %R 10.1088/0256-307X/37/4/045201 %P 045201%V 37 %N 4 %U {https://cpl.iphy.ac.cn/CN/abstract/article_105555.shtml} %8 2020-03-06 %X 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.