Wang Fei, Zhang Yang, Wang Zhijie, Zhang Haoxiong, Wu Xi, Bao Changhua, Li Jia, Yu Pu, Zhou Shuyun
State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing, 100084, People's Republic of China.
Shenzhen Geim Graphene Center and Institute of Materials Research, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, People's Republic of China.
Nat Commun. 2023 Aug 16;14(1):4945. doi: 10.1038/s41467-023-40591-5.
Ionic liquids provide versatile pathways for controlling the structures and properties of quantum materials. Previous studies have reported electrostatic gating of nanometer-thick flakes leading to emergent superconductivity, insertion or extraction of protons and oxygen ions in perovskite oxide films enabling the control of different phases and material properties, and intercalation of large-sized organic cations into layered crystals giving access to tailored superconductivity. Here, we report an ionic-liquid gating method to form three-dimensional transition metal monochalcogenides (TMMCs) by driving the metals dissolved from layered transition metal dichalcogenides (TMDCs) into the van der Waals gap. We demonstrate the successful self-intercalation of PdTe and NiTe, turning them into high-quality PdTe and NiTe single crystals, respectively. Moreover, the monochalcogenides exhibit distinctive properties from dichalcogenides. For instance, the self-intercalation of PdTe leads to the emergence of superconductivity in PdTe. Our work provides a synthesis pathway for TMMCs by means of ionic liquid gating driven self-intercalation.
离子液体为控制量子材料的结构和性质提供了多种途径。先前的研究报道了纳米厚薄片的静电门控导致出现超导性，在钙钛矿氧化物薄膜中质子和氧离子的插入或提取能够控制不同相和材料性质，以及将大尺寸有机阳离子插入层状晶体中可实现定制的超导性。在此，我们报道一种离子液体门控方法，通过将从层状过渡金属二硫属化物（TMDCs）溶解的金属驱入范德华间隙来形成三维过渡金属单硫属化物（TMMCs）。我们证明了PdTe和NiTe的成功自插层，分别将它们转变为高质量的PdTe和NiTe单晶。此外，单硫属化物表现出与二硫属化物不同的特性。例如，PdTe的自插层导致PdTe中出现超导性。我们的工作通过离子液体门控驱动的自插层为TMMCs提供了一种合成途径。
