SIM-RUC
Surface & Interface Modeling
for Emerging Nanomaterials and Devices

Extraordinarily Strong Interlayer Interaction in Two-Dimensional Layered PtS2

Yuda Zhao,1,2,† Jingsi Qiao,3,† Peng Yu,4 Zhixin Hu,3 Ziyuan Lin,1 Shu Ping Lau,1 Zheng Liu,4 Wei Ji3,* & Yang Chai1,2,*

1 Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, People's Republic of China
2 The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, People's Republic of China
3 Department of Physics, Renmin University of China, Beijing, 100872, People's Republic of China
4 School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
These authors contribute equally to this work
* Correspondence should be addressed to Y. C. (ychai@polyu.edu.hk) or W. J. (wji@ruc.edu.cn

DOI:10.1002/adma.201504572    Publication Date: Feb 2nd 2016


Abstract:

The nature of crystal structureand physical properties of two-dimensional transition metal dichalocogenides (TMDs) are substantially dependent on the filling of d orbitals of transition metal. While the properties of group-6 TMDs have been extensively investigated, the properties of group-10 TMDs, with the richest d electrons, remain relatively unexplored. Here, we present experimental and theoretical studies on a new member of group-10 TMD - platinum disulfide (PtS2). We show that the indirect bandgap of PtS2 can be dramatically tuned from 1.6 eV (monolayer) to 0.25 eV (bulk counterpart), and the in-plane force constant (6.27×1019 N/m3) of PtS2 is as strong as that for the out-of-plane vibration (5.44×1019 N/m3). Such unusual electronic and vibrational properties in atomically thin samples can be understood to be a result of strongly electronic and mechanical interlayer interaction from the pz orbital hybridization of S atoms. Our studies shade light on the fundamental understanding of the effect of d-electron count on the interlayer interaction in TMDs.


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View: Advanced Materials  28 (12), 2399–2407 (2016)     Local Copy

Transition-Metal Dichalcogenides: Group-10 Expands the Spectrum

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