Defect-induced room temperature ferromagnetism in silicon carbide nanosheets. (July 2018)

• Record Type: Journal Article
• Authors: Yang, Guijin; Wu, Yanyan; Ma, Shuyi; Fu, Yujun; Gao, Daqiang; Zhang, Zhengmei; Li, Jinyun
• Is Part Of: Superlattices and microstructures. Volume 119(2018)
• Page Start: 19
• Page End: 24
• Publication Date: 2018-07
• Subjects: Silicon carbide -- Ferromagnetism -- Liquid exfoliation -- Nanosheets -- Defects; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2018.04.032
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: Silicon carbide (SiC) nanosheets with different sizes and thickness were synthesized by a liquid exfoliation method by varying the exfoliating time in the N, N-dimethylformamide organic solvent. During the exfoliating time increasing from 4 to 16 h, the size of the SiC nanosheets decreases gradually from 500 to 200 nm, and the thickness decreases from 9 to 3.5 nm. Results showed that all prepared SiC nanosheets show intrinsic room temperature ferromagnetism, which is greatly different to the diamagnetism nature of virgin bulk SiC. Moreover, the saturation magnetization of the SiC nanosheets increases monotonously from 0.005 to 0.018 emu/g as the size and thickness decrease. Further studies via transmission electron microscopy, superconducting quantum interference device, and electron spin resonance revealed that the origin of the ferromagnetism in SiC nanosheets might be attributed to the defects with carbon dangling bond on the surface of nanosheets. Highlights: SiC nanosheets with different sizes and thickness were prepared. The intrinsic room temperature ferromagnetism might be attributed to the defects with carbon dangling bond on the surface of nanosheets.