External stimuli controlled multiferroic charge-transfer crystals
External stimuli controlled multiferroic charge-transfer crystals
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DOI：
10.1007/s12274-015-0975-8
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发表时间：
2016-01
期刊：
影响因子：
9.9
通讯作者：
W. Qin;Xiaomin Chen;J. Lohrman;Maogang Gong;G. Yuan;M. Wuttig;Shenqiang Ren
中科院分区：
文献类型：
--
作者：
W. Qin;Xiaomin Chen;J. Lohrman;Maogang Gong;G. Yuan;M. Wuttig;Shenqiang Ren
多铁性电荷转移晶体由于同时具有偶极有序性和自旋有序性而引起了人们的极大兴趣。大量的理论和实验研究表明，给体和受体络合物之间的分子堆积对于调节电荷转移使能的多官能团起着重要的作用。在这里，我们表明电荷转移相互作用可以由聚噻吩基和富勒烯受体基的全共轭嵌段共聚物组成的分离堆栈来控制。在电荷转移晶体中观察到了室温磁场效应、铁电性和各向异性磁性，这可以通过光激发和电荷掺杂来进一步控制。此外，电荷转移分离堆积晶体显示了外部刺激控制的极化和磁化强度，这为其在全有机多铁性材料中的多功能应用开辟了广阔的前景。
Multiferroic charge-transfer crystals have drawn significant interest due to their simultaneous dipolar and spin ordering. Numerous theoretical and experimental studies have shown that the molecular stacking between donor and acceptor complexes plays an important role in tuning charge-transfer enabled multifunctionality. Herein, we show that the charge-transfer interactions can be controlled by the segregated stack, consisting of polythiophene donor- and fullerene acceptor-based all-conjugated block copolymers. Room temperature magnetic field effects, ferroelectricity, and anisotropic magnetism are observed in charge-transfer crystals, which can be further controlled by photoexcitation and charge doping. Furthermore, the charge-transfer segregated stack crystals demonstrate external stimuli controlled polarization and magnetization, which opens up their multifunctional applications for all-organic multiferroics.