Gupta Kriti, Jha Plawan Kumar, Dadwal Arun, Debnath Anil K, Jaiswal Ishan, Rana Shammi, Joy Pattayil A, Ballav Nirmalya
Department of Chemistry , Indian Institute of Science Education and Research (IISER) , Pune 411008 , India.
Physical and Materials Chemistry Division , National Chemical Laboratory (NCL) , Pune 411008 , India.
J Phys Chem Lett. 2019 Jun 6;10(11):2663-2668. doi: 10.1021/acs.jpclett.9b00839. Epub 2019 May 9.
An elegant platform to explore frustrated magnetism is the kagome spin lattice. In this work, clinoatacamite, a naturally occurring S = 1/2 kagome-like antiferromagnetic insulator, is synthesized in water at ambient pressure for the first time from a cuprous chloride (CuCl) precursor whereby Cu(I) was spontaneously oxidized to Cu(II) in the form of clinoatacamite [Cu(OH)Cl] with a simultaneous reduction of graphene oxide (GO) to reduced graphene oxide (rGO) in one pot. A stable nanocomposite of phase-pure clinoatacamite nanocrystals embedded in the rGO matrix was isolated. The clinoatacamite-rGO nanocomposite was determined to be magnetically active with a markedly enhanced coercive field of ∼2500 Oe at 5 K as well as electronically active with a conductivity value of ∼200 S·m at 300 K. Our results illustrate an avenue of combining exotic magnetic and electronic lattices without impeding their individual characteristics and synergistically generating a new class of magnetic semiconductors.
探索阻挫磁性的一个出色平台是 Kagome 自旋晶格。在这项工作中，首次在常压下于水中由氯化亚铜（CuCl）前驱体合成了斜氯铜矿，它是一种天然存在的 S = 1/2 类 Kagome 反铁磁绝缘体，其中 Cu(I) 以斜氯铜矿 [Cu(OH)Cl] 的形式自发氧化为 Cu(II)，同时氧化石墨烯（GO）在同一反应釜中被还原为还原氧化石墨烯（rGO）。分离出了嵌入 rGO 基质中的相纯斜氯铜矿纳米晶体的稳定纳米复合材料。斜氯铜矿 - rGO 纳米复合材料被确定具有磁活性，在 5 K 时矫顽场显著增强至约 2500 Oe，并且具有电子活性，在 300 K 时电导率值约为 200 S·m。我们的结果展示了一种将奇特的磁性和电子晶格相结合的途径，同时不阻碍它们各自的特性，并协同产生一类新型的磁性半导体。
