Antiferromagnetism in two-dimensional polyradical nanosheets

Antiferromagnetism in two-dimensional polyradical nanosheets
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二维多自由基纳米片中的反铁磁性

DOI:
10.1039/c8py01287c
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发表时间:
2018-11
期刊:
影响因子:
4.6
通讯作者:
Sheng Zhigao
Sheng Zhigao
中科院分区:
化学2区
文献类型:
--
作者:
Yang Yang;Liu Caixing;Xu Xueli;Meng Zhi;Tong Wei;Ma Zongwei;Zhou Chun;Sun Yuping;Sheng Zhigao

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二维(2D)有机磁性材料在自旋电子学领域具有巨大的研究和应用价值。然而,与多样化的无机材料不同,寻找二维有机磁性材料仍然是一个重大挑战。在这项工作中,利用三(2,3,5,6-四氯-4-乙炔基苯基)甲基自由基在液/液界面的聚合成功合成了独立的二维有机磁性多自由基(OMP)纳米片。所得OMP具有二维片状形貌,聚合后具有三芳基甲基自由基,可作为自旋中心。通过自由基之间的磁交换耦合,OMP 显示出反铁磁行为,尼尔温度为 42.5 K。除了 OMP 之外,这一发现还为合成其他潜在反铁磁二维有机材料提供了一条途径,这些材料可以作为二维有机自旋电子器件的重要构建模块。
Two-dimensional (2D) organic magnetic materials have great value for research and applications in spintronics. However, unlike the diverse inorganic materials, finding 2D organic magnetic materials is still a major challenge. In this work, freestanding 2D organic magnetic polyradical (OMP) nanosheets were successfully synthesized using the polymerization of tris(2,3,5,6-tetrachloro-4-ethynylphenyl)methyl radicals at a liquid/liquid interface. The OMP obtained has a 2D sheet-like morphology and possesses triarylmethyl radicals after polymerization, which can act as spin centers. With the magnetic exchange coupling between radicals, the OMP shows an antiferromagnetic behavior with a Neel temperature of 42.5 K. Besides the OMP, this discovery also provides a route for synthesis of other potential antiferromagnetic 2D organic materials, which can act as essential building blocks in 2D organic spintronic devices.
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