Supercritical CO 2 -induced New Chemical Bond of C-O-Si in Graphdiyne to Achieve Robust Room-Temperature Ferromagnetism.

Autor: Yang J; Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450052, P. R. China., Gao B; College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, P. R. China., Liu W; Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450052, P. R. China., Du J; College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, P. R. China., Xu Q; Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou, 450052, P. R. China.; College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450052, P. R. China.
Jazyk: angličtina
Zdroj: Chemphyschem : a European journal of chemical physics and physical chemistry [Chemphyschem] 2023 May 16; Vol. 24 (10), pp. e202200793. Date of Electronic Publication: 2023 Mar 02.
DOI: 10.1002/cphc.202200793
Abstrakt: The realization of ferromagnetic ordering of two-dimensional (2D) carbon material graphdiyne (GDY) has attracted great attention due to its promising application in spin semiconductor devices. However, the absence of localized spins makes the pristine GDY intrinsically nonferromagnetic. Herein, we report the realization of robust room-temperature (RT) ferromagnetism (FM) with Curie temperature (T C ) up to 325 K for GDY Nanosheets (GDYNs) by supercritical CO 2 (SC CO 2 ). Experimental and theoretical calculations reveal that the new chemical bond of C-O-Si can be formed because of the unique effect of SC CO 2 , which help to enhance the charge transfer and generates long-range ferromagnetic order. The RT saturation magnetization (M S ) reaches 1.125 emu/g, which is much higher than that of carbon-based materials reported up to now. Meanwhile, by changing the conditions of SC CO 2 such as pressure, ferromagnetic responses can be manipulated, which is great for potential spintronics applications of GDY.
(© 2023 Wiley-VCH GmbH.)
Databáze: MEDLINE
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