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

作　　者：Jiaolong Liu Siyu Zhang Dan Qu Xuejiao Zhou Moxuan Yin Chenxuan Wang Xuelin Zhang Sichen Li Peijun Zhang Yuqi Zhou Kai Tao Mengyang Li Bing Wei Hongjing Wu Mengyang Li Bing Wei[1] Hongjing Wu[5] 

机构地区：[1]School of Physics,Xidian University,Xi’an 710071,People’s Republic of China [2]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 [3]School of Microelectronics,Xidian University,Xi’an 710071,People’s Republic of China [4]School of Telecommunication Engineering,Xidian University,Xi’an 710071,People’s Republic of China [5]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 [6]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

出　　处：《Nano-Micro Letters》2025年第1期528-547,共20页纳微快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grants nos.62201411,62371378,22205168,52302150 and 62304171);the China Postdoctoral Science Foundation(2022M722500);the Fundamental Research Funds for the Central Universities(Grants nos.ZYTS2308 and 20103237929);Startup Foundation of Xidian University(10251220001).

摘　　要：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.

关 键 词：Defects-rich heterointerfaces Sulfides Polarization coupling Electromagnetic wave absorption 

分 类 号：TB332[一般工业技术—材料科学与工程]