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Room-temperature ferroelectricity in supramolecular networks of charge-transfer complexes

机译:电荷转移配合物的超分子网络中的室温铁电

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摘要

Materials exhibiting a spontaneous electrical polarization that can be switched easily between antiparallel orientations are of potential value for sensors, photonics and energy-efficient memories. In this context, organic ferroelectrics are of particular interest because they promise to be lightweight, inexpensive and easily processed into devices. A recently identified family of organic ferroelectric structures is based on intermolecular charge transfer, where donor and acceptor molecules co-crystallize in an alternating fashion known as a mixed stack: in the crystalline lattice, a collective transfer of electrons from donor to acceptor molecules results in the formation of dipoles that can be realigned by an external field as molecules switch partners in the mixed stack. Although mixed stacks have been investigated extensively, only three systems are known to show ferroelectric switching, all below 71 kelvin. Here we describe supramolecular charge-transfer networks that undergo ferroelectric polarization switching with a ferroelectric Curie temperature above room temperature. These polar and switchable systems utilize a structural synergy between a hydrogen-bonded network and charge-transfer complexation of donor and acceptor molecules in a mixed stack. This supramolecular motif could help guide the development of other functional organic systems that can switch polarization under the influence of electric fields at ambient temperatures.
机译:表现出自发极化的材料可以在反平行方向之间轻松切换,对传感器,光子学和高能效存储器具有潜在价值。在这种情况下,有机铁电材料特别受关注,因为它们有望实现轻质,廉价且易于加工成器件。最近发现的一种有机铁电结构家族是基于分子间电荷转移的,其中供体和受体分子以交替的方式共结晶,称为混合堆:在晶格中,电子从供体到受体分子的集体转移导致偶极子的形成,当分子在混合堆栈中切换伙伴时,可以由外部场重新排列。尽管已经对混合堆进行了广泛的研究,但是只有三个系统显示出铁电开关,所有这些系统都低于71开尔文。在这里,我们描述了铁电居里温度高于室温时发生铁电极化转换的超分子电荷转移网络。这些极性和可切换的系统利用氢键网络与混合堆中供体和受体分子的电荷转移络合之间的结构协同作用。这种超分子基序可以帮助指导其他功能性有机体系的发展,这些体系可以在环境温度下的电场作用下切换极化。

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  • 来源
    《Nature》 |2012年第7412期|p.485-489|共5页
  • 作者单位

    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA,Department of Electrical Engineering, University of California, Los Angeles, Los Angeles, California 90095, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA,ANSER Center, Northwestern University, Evanston, Illinois 60208, USA,Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA,ANSER Center, Northwestern University, Evanston, Illinois 60208, USA,Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA,Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, South Korea;

    Department of Physics, Northwestern University, Evanston, Illinois 60208 USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Electrical Engineering, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA,Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, South Korea;

    Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Department of Electrical Engineering, Northwestern University, Evanston, Illinois 60208, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA,ANSER Center, Northwestern University, Evanston, Illinois 60208, USA,Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Department of Electrical Engineering, University of California, Los Angeles, Los Angeles, California 90095, USA;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA,Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA,Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA,Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA,;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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