Dielectric properties and microwaves response behavior of polypyrrole-derived N -doped carbon nanotubes
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Dielectric properties and microwaves response behavior of polypyrrole-derived N-doped carbon nanotubes Zhiqian Yang1, Yilu Xia1,*, Zimeng Zhou2, Chaochan Chen3, Jiayi Xu2, Junjie Shi2, Chang Xu1, Fan Wu2, and Aming Xie2,* 1
State Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact, Army Engineering University of PLA, Nanjing 210007, People’s Republic of China 2 School of Mechanical Engineering, Nanjing University of Science & Technology, Nanjing 210094, China 3 Division of Electron and Electricity Measurement Technology, Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China
Received: 13 October 2020
ABSTRACT
Accepted: 29 October 2020
A series of N-doped carbon nanotubes (NCNTs) have been synthesized via a temperature-controlled annealing of polypyrrole (PPy) hierarchical nanostructures. The microstructures, dielectric properties and microwaves response behavior of these NCNTs were systematically investigated. The results indicate that initial pyrrolic N in PPy was gradually converted into pyridinic and graphitic N during the annealing process. NCNT prepared at 700 °C exhibits excellent broadband microwave absorption performance, where its effective absorption bandwidth (reflection loss value lower than - 10 dB) reaches 8.20 GHz in the frequency range of 9.80–18.00 GHz. A model refers to conductive loss and polarization relaxation was adopted to explain the high-performance microwave absorption. This research greatly expands the development of N-doped CNTs for the application in microwave areas.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction During the past decade, electromagnetic radiation pollution has been increasingly severe with the development of electronic equipment. Microwaves are part of the electromagnetic spectrum with wavelengths of from one millimeter to a meter [1]. Conductive materials [2–4] are widely used in the
microwave absorption (MA) field. Besides, much effort has been focused on the development of highperformance MA materials to handle electromagnetic radiation pollution, especially in carbon-based MA materials such as carbon black [5], carbon fiber [6–8], carbon nanotubes (CNTs) [9–11], grapheme [12–14], and their composites [15–17]. High-efficiency MA performance and light weight are two key factors that drive practical applications of MA materials [18].
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04799-1
J Mater Sci: Mater Electron
Among these carbon materials, CNTs show several advantages, such as regular one-dimensional hollow nanostructure, frizzy conjugate aromatic rings, light weight and high surficial electron mobility. However, CNTs are commonly used as reflection-related electromagnetic interference shielding materials rather than microwave absorbents, just because of their high electrical conductivity. The MA performance of a material critically depends on its intrinsic electrical conductivity, microstructure,
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