Spontaneous self-intercalation of copper atoms into transition metal dichalcogenides
- Wuhan Univ. (China)
- Tsinghua Univ., Shenzhen (China)
- HuaZhong Univ. of Science and Technology, Wuhan, HB (China)
- Univ. of Houston, TX (United States)
- Univ. of Houston, TX (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of Cincinnati, OH (United States); Rice Univ., Houston, TX (United States)
- Rice Univ., Houston, TX (United States)
Intercalated transition metal dichalcogenides (TMDs) have attracted substantial interest due to their exciting electronic properties. Here, we report a unique approach where copper (Cu) atoms from bulk Cu solid intercalate spontaneously into van der Waals (vdW) gaps of group IV and V layered TMDs at room temperature and atmospheric pressure. This distinctive phenomenon is used to develop a strategy to synthesize Cu species–intercalated layered TMD compounds. A series of Cu-intercalated 2H-NbS2 compounds were obtained with homogeneous distribution of Cu intercalates in the form of monovalent Cu (I), occupying the tetrahedral sites coordinated by S atoms within the interlayer space of NbS2. The Fermi level of NbS2 shifts up because of the intercalation of Cu, resulting in the improvement of electrical conductivity in the z-direction. On the other hand, intercalation of Cu into vdW gaps of NbS2 systematically suppresses the superconducting transition temperature (Tc) and superconducting volume fraction.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); Fundamental Research Funds for the Central Universities; Wuhan University; US Air Force Office of Scientific Research (AFOSR); National Key Research and Development Program of China; Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program; Shenzhen Projects for Basic Research
- Grant/Contract Number:
- FA9550-14-1-0268; FA9550-18-1-0072
- OSTI ID:
- 1600828
- Journal Information:
- Science Advances, Vol. 6, Issue 7; ISSN 2375-2548
- Publisher:
- AAASCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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