Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Adlayer structure of TCNQ molecules on Cu(111): Anin situ STM study

  • 80 Accesses

  • 4 Citations


In situ electrochemical scanning tunneling microscopy (STM) was employed to examine tetracyanoquinodimethane (TCNQ) layer adsorbed on Cu(111) electrode surface in 0.1 mol/L HClO4 solution. The TCNQ molecules are found to form highly-ordered long range adlayer with a (4 × 4) symmetry. Each TCNQ molecule is adsorbed on Cu(111) surface in flat-lying orientation. The molecules are preferentially aligned with their long axes in the [1¯21 ] direction. A structural model is proposed for the adlayer.

This is a preview of subscription content, log in to check access.


  1. 1.

    Siegenthaler, H., Scanning Tunneling Microscopy (II) (eds. Wiesendanger, R., Guntherodt, H. -J.), New York: Springer-Verlag, 1992, 7–49.

  2. 2.

    Bard, A. J., Abruna, H. D., Chidsey, C. E. et al., The electrode/electrolyte interface-A status report, J. Phys. Chem., 1996, 97: 7147.

  3. 3.

    Itaya, K., Batina, N., Kunitake, M. et al.,In situ sanning tunneling microscopy of organic molecules adsorbed on iodine-modified Au(111), Ag(111) and Pt(111) electrodes, in Solid-Liquid Electrochemical Interfaces (eds. Jerkiewicz, G., Soriaga, M. P., Uosaki, K. et al.), American Chemical Society, 1997, 171–188.

  4. 4.

    Cunha, F., Tao, N. J., Surface charge induced order-disorder transition in an organic monolayer, Phys. Rev. Lett., 1995, 75: 2376.

  5. 5.

    Yau, S.-L., Kim, Y.-G., Itaya, K.,In situ scanning tunneling microscopy of benzene adsorbed on Rh(111) and Pt(111) in HF solution, J. Am. Chem. Soc., 1996, 118: 7795.

  6. 6.

    Wan, L.-J., Itaya, K.,In situ scanning tunneling microscopy of benzene, naphthalene, and anthracene adsorbed on Cu(111) in solution, Langmuir, 1997, 13: 7173.

  7. 7.

    Long, R. E., Sparks, R. A., Trueblood, K. N., The crystal and molecular structure of 7,7,8,8-tetracyanoquinodimethane, Acta Cryst., 1965, 18: 932.

  8. 8.

    Matsuzaki, S., Kuwata, R., Toyota, K., Raman spectra of conducting TCNQ salts: Estimation of the degree of charge transfer from vibrational frequencies, Solid State Communications, 1980, 33: 403.

  9. 9.

    Robinson, A. L., Nanocomputer from organic molecules? Science, 1983, 220: 940.

  10. 10.

    Potember, R. S., Poehler, T. O., Cowan, D. O., Electrical switching and memory phenomena in Cu-TCNQ thin film, Appl. Phys. Lett., 1979, 34: 405.

  11. 11.

    Benson, R. C., Hoffman, R. C., Potember, R. S. et al., Spectral dependence of reversible optically induced transitions in organometallic compounds, Appl. Phys. Lett., 1983, 42: 855.

  12. 12.

    Schott, J. H., Ward, M. D., Snapshots of crystal growth: Nanoclusters of organic conductor on Au(111) surface, J. Am. Chem. Soc., 1994, 116: 6806.

  13. 13.

    Schott, J. H., Yip, C. M., Ward, M. D., Self-assembly of low-dimensional molecular nanoclusters on Au(111) surface, Langmuir, 1995, 11: 177.

  14. 14.

    Erley, W., Ibach, H., Vibrational spectra of tetracyanoquino-dimethane (TCNQ) adsorbed on the Cu(111) surface, Surf. Sci., 1986, 178: 565.

  15. 15.

    Somorjai, G. A., Introduction to Surface Chemistry and Catalysis, New York: John Wiley & Sons Inc., 1994, 67.

  16. 16.

    Weiss, P. S., Eigler, D. M., Site dependence of the apparent shape of a molecule in scanning tunneling microscope images: Benzene on Pt(111), Phys. Rev. Lett., 1993, 71: 3139.

Download references

Author information

Correspondence to Lijun Wan.

About this article

Cite this article

Wan, L., Kingo, I. Adlayer structure of TCNQ molecules on Cu(111): Anin situ STM study. Chin.Sci.Bull. 46, 377–379 (2001). https://doi.org/10.1007/BF03183267

Download citation


  • TCNQ molecule
  • electrochemical scanning tunneling microscopy
  • Cu(111)
  • adlayer structure