journal article·2024-08Open access

Observing Weak Interchain Coupling in 1D vdWs Ternary Mo6Se2I8 to Achieve Probe Exfoliation of Ultrathin Molecular Chains

Yanchao Guan, Ye Ding, Yuqiang Fang, Fei Zhou, Jiapeng Wang, Xinyu Li, Shouxin Zhao, Bo Gao, Chengyan Xu, Liang Zhen, Fuqiang Huang, Lijun Yang, Yang Li

Advanced Functional Materials· Volume 34· Issue 34

Abstract

Abstract van der Waals (vdWs) interchain coupling is a unique feature of 1D vdWs materials, where strong vdWs coupling in 1D vdWs materials leads to the thickness‐dependent physical properties, while weak vdWs coupling can preserve the single‐chain property even in their thick counterparts. Different from 2D vdWs materials, due to their nanoscale widths, identifying and producing ultrathin 1D molecular chains are challenging, severely limit their device applications. Thus, looking for novel 1D vdWs materials with weak interchain coupling is crucial. In this paper, the authors report that the 1D ternary vdWs material, Mo6Se2I8 with non‐centrosymmetric characteristic and strong optical anisotropy, exhibits weak interchain coupling. On one hand, the density functional theory (DFT) calculations theoretically demonstrate its thickness‐independent electronic structure, negligible interchain differential charge density, and weak cleavage energy as low as 0.256 J m−2. On the other hand, the thickness‐independent work function and low first‐order temperature coefficient of −0.0030 cm−1 K−1 further experimentally confirm its weak interchain coupling. Moreover, taking advantage of this weak vdWs coupling characteristic, the in situ exfoliation of the Mo6Se2I8 nanowires is achieved by using a nanoprobe in a scanning electron microscope (SEM), obtaining ultrathin molecular chains with a thickness of ≈1.2 nm.
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Research context

OpenAlex topics: 2D Materials and Applications · MXene and MAX Phase Materials · Perovskite Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Mechatronics Engineering Harbin Institute of Technology Harbin 150001 China

Key Laboratory of Micro‐systems and Micro‐structures Manufacturing Ministry of Education Harbin Institute of Technology Harbin 150001 China

State Key Laboratory of High‐Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

School of Materials and Chemistry Southwest University of Science and Technology Mianyang 621010 China

School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

Institute of Modern Optics School of Physics Harbin Institute of Technology Harbin 150001 China

Sauvage Laboratory for Smart Materials School of Materials Science and Engineering Harbin Institute of Technology (Shenzhen) Shenzhen 518055 China

Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou 450000 China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Shanghai Aerospace Science and Technology Innovation Foundation

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