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Title: Spontaneous self-intercalation of copper atoms into transition metal dichalcogenides

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [2];  [1]; ORCiD logo [1];  [5]; ORCiD logo [2]; ORCiD logo [6]; ORCiD logo [1]; ORCiD logo [7]
  1. Wuhan Univ. (China)
  2. Tsinghua Univ., Shenzhen (China)
  3. HuaZhong Univ. of Science and Technology, Wuhan, HB (China)
  4. Univ. of Houston, TX (United States)
  5. Univ. of Houston, TX (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Univ. of Cincinnati, OH (United States); Rice Univ., Houston, TX (United States)
  7. 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
Citation Metrics:
Cited by: 63 works
Citation information provided by
Web of Science

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