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Vol. 17 (2025)

Defects-Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites with Robust Electromagnetic Wave Absorption

https://doi.org/10.1007/s40820-024-01515-0
Jiaolong Liu
School of Physics, Xidian University, Xi’an 710071, People’s Republic of China
Siyu Zhang
School of Physics, Xidian University, Xi’an 710071, People’s Republic of China
Dan Qu
School of Physics, Xidian University, Xi’an 710071, People’s Republic of China
Xuejiao Zhou
School of Advanced Materials and Nanotechnology, State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, Xidian University, Xi’an 710071, People’s Republic of China
Moxuan Yin
School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Chenxuan Wang
School of Microelectronics, Xidian University, Xi’an 710071, People’s Republic of China
Xuelin Zhang
School of Telecommunication Engineering, Xidian University, Xi’an 710071, People’s Republic of China
Sichen Li
School of Advanced Materials and Nanotechnology, State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, Xidian University, Xi’an 710071, People’s Republic of China
Peijun Zhang
School of Physics, Xidian University, Xi’an 710071, People’s Republic of China
Yuqi Zhou
School of Physics, Xidian University, Xi’an 710071, People’s Republic of China
Kai Tao
The Ministry of Education Key Laboratory of Micro and Nano Systems forAerospace, School of Mechanical Engineering, Northwestern PolytechnicalUniversity, Xi’an 710072, People’s Republic of China
Mengyang Li
School of Physics, Xidian University, Xi’an 710071, People’s Republic of China
Bing Wei
School of Physics, Xidian University, Xi’an 710071, People’s Republic of China
Hongjing Wu
MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China

Corresponding Author: Hongjing Wu

wuhongjing@nwpu.edu.cn

Nano-Micro Letters, Vol. 17 (2025), Article Number: 24

Abstract

Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies, as well as veiled dielectric-responsive character, are instrumental in electromagnetic dissipation. Conventional methods, however, constrain their delicate constructions. Herein, an innovative alternative is proposed: carrageenan-assistant cations-regulated (CACR) strategy, which induces a series of sulfides nanoparticles rooted in situ on the surface of carbon matrix. This unique configuration originates from strategic vacancy formation energy of sulfides and strong sulfides-carbon support interaction, benefiting the delicate construction of defects-rich heterostructures in MxSy/carbon composites (M-CAs). Impressively, these generated sulfur vacancies are firstly found to strengthen electron accumulation/consumption ability at heterointerfaces and, simultaneously, induct local asymmetry of electronic structure to evoke large dipole moment, ultimately leading to polarization coupling, i.e., defect-type interfacial polarization. Such “Janus effect” (Janus effect means versatility, as in the Greek two-headed Janus) of interfacial sulfur vacancies is intuitively confirmed by both theoretical and experimental investigations for the first time. Consequently, the sulfur vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth of 6.76 GHz at only 1.8 mm, compared to sulfur vacancies-free CAs without any dielectric response. Harnessing defects-rich heterostructures, this one-pot CACR strategy may steer the design and development of advanced nanomaterials, boosting functionality across diverse application domains beyond electromagnetic response.


Highlights:
1 A series of sulfides/carbon composites with sulfur vacancies-rich sulfides heterointerfaces are well-designed and developed via a simple one-pot carrageenan-assistant cations-regulated strategy.
2“Janus effect” of interfacial sulfur vacancies, which triggers strong defect-type interfacial polarization, are firstly intuitively confirmed by both theoretical and experimental investigations.
3 Optimized Co/Ni-carbon composites (CAs) imbued with sulfur vacancies-rich heterointerfaces displays broad absorption bandwidth of 6.76 GHz at only 1.8 mm, compared to sulfur vacancies-free CAs without any dielectric response.

Keywords

Defects-rich heterointerfaces Sulfides Polarization coupling Electromagnetic wave absorption
Liu, Jiaolong, Siyu Zhang, Dan Qu, Xuejiao Zhou, Moxuan Yin, Chenxuan Wang, Xuelin Zhang, Sichen Li, Peijun Zhang, Yuqi Zhou, Kai Tao, Mengyang Li, Bing Wei, and Hongjing Wu. 2024. “Defects-Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites With Robust Electromagnetic Wave Absorption”. Nano-Micro Letters 17 (September):24. https://doi.org/10.1007/s40820-024-01515-0.
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