Skip to main content
placeholder image

Spontaneous self-intercalation of copper atoms into transition metal dichalcogenides

Journal Article


Abstract


  • 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.

Publication Date


  • 2020

Citation


  • Liu, X. C., Zhao, S., Sun, X., Deng, L., Zou, X., Hu, Y., . . . Ajayan, P. M. (2020). Spontaneous self-intercalation of copper atoms into transition metal dichalcogenides. Science Advances, 6(7). doi:10.1126/sciadv.aay4092

Scopus Eid


  • 2-s2.0-85079539142

Web Of Science Accession Number


Volume


  • 6

Issue


  • 7

Abstract


  • 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.

Publication Date


  • 2020

Citation


  • Liu, X. C., Zhao, S., Sun, X., Deng, L., Zou, X., Hu, Y., . . . Ajayan, P. M. (2020). Spontaneous self-intercalation of copper atoms into transition metal dichalcogenides. Science Advances, 6(7). doi:10.1126/sciadv.aay4092

Scopus Eid


  • 2-s2.0-85079539142

Web Of Science Accession Number


Volume


  • 6

Issue


  • 7