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

Autor: Liu J; School of Physics, Xidian University, Xi'an, 710071, People's Republic of China., Zhang S; School of Physics, Xidian University, Xi'an, 710071, People's Republic of China., Qu D; School of Physics, Xidian University, Xi'an, 710071, People's Republic of China., Zhou X; 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., Yin M; School of Microelectronics, Xidian University, Xi'an, 710071, People's Republic of China., Wang C; School of Microelectronics, Xidian University, Xi'an, 710071, People's Republic of China., Zhang X; School of Telecommunication Engineering, Xidian University, Xi'an, 710071, People's Republic of China., Li S; 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., Zhang P; School of Physics, Xidian University, Xi'an, 710071, People's Republic of China., Zhou Y; School of Physics, Xidian University, Xi'an, 710071, People's Republic of China., Tao K; The Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace, School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an, 710072, People's Republic of China., Li M; School of Physics, Xidian University, Xi'an, 710071, People's Republic of China. limengyang@xidian.edu.cn., Wei B; School of Physics, Xidian University, Xi'an, 710071, People's Republic of China. bwei@xidian.edu.cn., Wu H; 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. wuhongjing@nwpu.edu.cn.
Jazyk: angličtina
Zdroj: Nano-micro letters [Nanomicro Lett] 2024 Sep 27; Vol. 17 (1), pp. 24. Date of Electronic Publication: 2024 Sep 27.
DOI: 10.1007/s40820-024-01515-0
Abstrakt: 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 M x S y /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.
(© 2024. The Author(s).)
Databáze: MEDLINE
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