journal article·2021-07-27

Realization of Strong Room-Temperature Ferromagnetism in Atomically Thin 2D Carbon Nitride Sheets by Thermal Annealing

Yong Wang, Yilv Guo, Zhaokun Wang, Lin Fu, Yu Zhang, Yongjie Xu, Shijun Yuan, Hongzhe Pan, Youwei Du, Jinlan Wang, Nujiang Tang

ACS Nano· Volume 15· Issue 7
Publisher page

Abstract

The presence of the intrinsic band gap of 3.06 eV makes atomically thin carbon nitride sheets (CNs) a promising spin-based semiconductor material. However, the absence of localized spins makes the pristine CNs intrinsically nonmagnetic. Here we report the realization of strong room-temperature (RT) ferromagnetism with a high Curie temperature of ca. 524.2 K in atomically thin 2D CNs by annealing pristine CNs at 700 °C. In particular, the RT saturated magnetization reaches as high as 0.71 emu/g, which is the highest value reported so far in carbon-based materials. The structural characterization combined with density functional theory calculations reveals that (i) the seven C-C bonds per unit cell were formed after annealing and (ii) the C-C bonds can introduce high-density localized spins and realize the long-range ferromagnetic couplings among these spins.
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Research context

OpenAlex topics: Electronic and Structural Properties of Oxides · Graphene research and applications · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, China

Academy of Advanced Interdisciplinary Research, School of Advanced Materials and Nanotechnology, Xidian University, Xi’an 710126, China

School of Physics, Southeast University, Nanjing 211189, China

School of Physics and Electronic Engineering, Linyi University, Linyi 276005, China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China

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