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Molecular Conductors

Molecular Conductors. By: Adam Krause 4/17/07 Physics 672. Molecular Conductor Quick Intro. Two types of molecules: carbon nanotubes and polyphenylene-based molecules Multiple approaches to conductance experiments Molecular conductors as applied to molecular electronics.

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Molecular Conductors

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  1. Molecular Conductors By: Adam Krause 4/17/07 Physics 672

  2. Molecular Conductor Quick Intro. • Two types of molecules: carbon nanotubes and polyphenylene-based molecules • Multiple approaches to conductance experiments • Molecular conductors as applied to molecular electronics

  3. Polyphenylene-based molecules Figure adapted from: Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 386

  4. Mechanically Controlled Break-Junction Method Benzene-1,4-dithiolate Figures from: Reed, M. A., et al., Science 278, (1997) 252

  5. Mechanically Controlled Break-Junction Method Benzene-1,4-dithiolate Figures from: Reed, M. A., et al., Science 278, (1997) 252

  6. Crossed-Wire Method Oligo(phenylene ethynylene) Figure from: Kushmerick, J. G., et al.,Phys. Rev. Lett 89, (2002) 086802

  7. Crossed-Wire Method Oligo(phenylene ethynylene) Figure from: Kushmerick, J. G., et al.,Phys. Rev. Lett 89, (2002) 086802

  8. STM Break-Junction Method Many Thiolated Molecules Used Figure from: Xiao, X., et al.,Nano. Lett. 4, (2004) 267

  9. STM Break-Junction Method Many Thiolated Molecules Used Figure from: Xu, B. Q.and N. J. Tao, Science 307, (2003) 1221

  10. Conductance Summary • The various polyphenylene-based molecules shown here exhibit conductive properties. • These properties can change based on the electrode-molecule bond. • There are several approaches to measuring the conductance and current of a molecule

  11. Applications Diode Figure from: Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 386

  12. Applications Logic Gates Figure from: Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 386

  13. Applications Memory Figures from: Chen, J., et al., Ann. N.Y. Acad. Sci. 960, (2002) 69

  14. Summary • The conductance of functionalized polyphenylene-based molecules can be tailored to behave in a desired manner. • In theory, diode molecules are possible. • These diodes can be used to build more complex molecular electronic devices. • The persistent conductance states of some molecules can be utilized for molecular memory applications.

  15. References • Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 386 • Reed, M. A., et al., Science 278, (1997) 252 • Kushmerick, J. G., et al.,Phys. Rev. Lett 89, (2002) 086802 • Xiao, X., et al.,Nano. Lett. 4, (2004) 267 • Xu, B. Q.and N. J. Tao, Science 307, (2003) 1221 • Chen, J., et al., Ann. N.Y. Acad. Sci. 960, (2002) 69

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