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Precision control of single-molecule electrical junctions

Nature Materials volume 5, pages 9951002 (2006) | Download Citation



There is much discussion of molecules as components for future electronic devices. However, the contacts, the local environment and the temperature can all affect their electrical properties. This sensitivity, particularly at the single-molecule level, may limit the use of molecules as active electrical components, and therefore it is important to design and evaluate molecular junctions with a robust and stable electrical response over a wide range of junction configurations and temperatures. Here we report an approach to monitor the electrical properties of single-molecule junctions, which involves precise control of the contact spacing and tilt angle of the molecule. Comparison with ab initio transport calculations shows that the tilt-angle dependence of the electrical conductance is a sensitive spectroscopic probe, providing information about the position of the Fermi energy. It is also shown that the electrical properties of flexible molecules are dependent on temperature, whereas those of molecules designed for their rigidity are not.

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  1. 1.

    et al. Reproducible measurement of single-molecule conductivity. Science 294, 571–574 (2001).

  2. 2.

    et al. Measurement of single molecule conductivity using the spontaneous formation of molecular wires. Phys. Chem. Chem. Phys. 6, 4330–4337 (2004).

  3. 3.

    et al. Redox state dependence of single molecule conductivity. J. Am. Chem. Soc. 125, 15294–15295 (2003).

  4. 4.

    & Measurement of single-molecule resistance by repeated formation of molecular junctions. Science 301, 1221–1223 (2003).

  5. 5.

    et al. Conductance properties of single-molecule junctions. Physica E 18, 231–232 (2003).

  6. 6.

    et al. Driving current through single organic molecules. Phys. Rev. Lett. 88, 176804 (2002).

  7. 7.

    et al. Unimolecular electrical rectification in hexadecylquinolinium tricyanoquinodimethanide. J. Am. Chem. Soc. 119, 10455–10466 (1997).

  8. 8.

    & Self-assembly of single electron transistors and related devices. Chem. Soc. Rev. 27, 1–12 (1998).

  9. 9.

    , , , & A Single-electron transistor made from a cadmium selenide nanocrystal. Nature 389, 699–701 (1997).

  10. 10.

    , , & Large on-off ratios and negative differential resistance in a molecular electronic device. Science 286, 1550–1552 (1999).

  11. 11.

    et al. Electronically configurable molecular-based logic gates. Science 285, 391–394 (1999).

  12. 12.

    et al. “Coulomb” staircase at room temperature in a self-assembled molecular nanostructure. Science 272, 1323–1325 (1996).

  13. 13.

    et al. Molecular wire formation from viologen assemblies. Langmuir 20, 7694–7702 (2004).

  14. 14.

    et al. Thermal gating of the single molecule conductance of alkanedithiols. Faraday Discus. 131, 253–264 (2006).

  15. 15.

    & Single molecule tunnelling conductance: the temperature and length dependences controlled by conformational fluctuations. Chem. Phys. 324, 276–279 (2006).

  16. 16.

    & Orientational dependence of current through molecular films. Phys. Rev. B 64, 195413 (2001).

  17. 17.

    , & Impacts of metal electrode and molecule orientation on the conductance of a single molecule. Appl. Phys. Lett. 85, 5992–5994 (2004).

  18. 18.

    et al. Spin and molecular electronics in atomically-generated orbital landscapes. Phys. Rev. B 73, 085414 (2006).

  19. 19.

    et al. Towards molecular spintronics. Nature Mater. 4, 335–339 (2005).

  20. 20.

    , & Theoretical interpretation of conductivity measurements of a thiotolane sandwich. A molecular scale electronic controller. J. Am. Chem. Soc. 120, 3970–3974 (1998).

  21. 21.

    , , & Atomic resolution scanning tunneling microscopy images of Au(111) surfaces in air and polar organic-solvents. J. Chem. Phys. 95, 2193–2196 (1991).

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This work was supported by EPSRC (Mechanisms of Single Molecule Conductance) (Liverpool), Basic Technology (Controlled Electron Transport) (Durham and Lancaster) and a Lancaster–EPSRC Portfolio Partnership and MCRTN Fundamentals of Nanoelectronics.

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  1. Centre for Nanoscale Science and Department of Chemistry, University of Liverpool, L69 7ZD, UK

    • Wolfgang Haiss
    • , David J. Schiffrin
    • , Simon J. Higgins
    •  & Richard J. Nichols
  2. Department of Chemistry and Centre for Molecular and Nanoscale Electronics, University of Durham, Durham DH1 3LE, UK

    • Changsheng Wang
    • , Andrei S. Batsanov
    •  & Martin R. Bryce
  3. Department of Physics, Lancaster University, Lancaster LA1 4YB, UK

    • Iain Grace
    •  & Colin J. Lambert


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Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Wolfgang Haiss.

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