Extraordinarily Strong Interlayer Interaction in 2D Layered PtS2

Yuda Zhao; Jingsi Qiao; Peng Yu; Zhixin Hu; Ziyuan Lin; Shu Ping Lau; Zheng Liu; Wei Ji; Yang Chai

doi:10.1002/adma.201504572

Extraordinarily Strong Interlayer Interaction in 2D Layered PtS2

Adv Mater. 2016 Mar 23;28(12):2399-407. doi: 10.1002/adma.201504572. Epub 2016 Feb 2.

Authors

Yuda Zhao^{1

2}, Jingsi Qiao^{3

4}, Peng Yu⁵, Zhixin Hu^{3

4}, Ziyuan Lin^{1

2}, Shu Ping Lau^{1

2}, Zheng Liu⁵, Wei Ji^{3

4}, Yang Chai^{1

2}

Affiliations

¹ Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P. R. China.
² The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen, 518057, P. R. China.
³ Department of Physics, Renmin University of China, Beijing, 100872, P. R. China.
⁴ Beijing Key Laboratory of Optoelectronic Functional Materials & Micro-Nano Devices, Renmin University of China, Beijing, 100872, P. R. China.
⁵ School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798.

PMID: 26833689
DOI: 10.1002/adma.201504572

Abstract

Platinum disulfide (PtS2 ), a new member of the group-10 transition-metal dichalcogenides, is studied experimentally and theoretically. The indirect bandgap of PtS2 can be drastically tuned from 1.6 eV (monolayer) to 0.25 eV (bulk counterpart), and the interlayer mechanical coupling is almost isotropic. It can be explained by strongly interlayer interaction from the pz orbital hybridization of S atoms.

Keywords: interlayer interactions; low-frequency Raman; platinum disulfide; transition metal dichalcogenides.