Molecular Conductors
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Transcript of Molecular Conductors
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Molecular Conductors
By: Adam Krause4/17/07
Physics 672
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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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Polyphenylene-based molecules
Figure adapted from: Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 386
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Mechanically Controlled Break-Junction Method
Figures from: Reed, M. A., et al., Science 278, (1997) 252
Benzene-1,4-dithiolate
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Mechanically Controlled Break-Junction Method
Benzene-1,4-dithiolate
Figures from: Reed, M. A., et al., Science 278, (1997) 252
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Crossed-Wire Method
Oligo(phenylene ethynylene)
Figure from: Kushmerick, J. G., et al., Phys. Rev. Lett 89, (2002) 086802
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Crossed-Wire Method
Oligo(phenylene ethynylene)
Figure from: Kushmerick, J. G., et al., Phys. Rev. Lett 89, (2002) 086802
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STM Break-Junction Method
Many Thiolated Molecules Used
Figure from: Xiao, X., et al., Nano. Lett. 4, (2004) 267
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STM Break-Junction Method
Figure from: Xu, B. Q.and N. J. Tao, Science 307, (2003) 1221
Many Thiolated Molecules Used
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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
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Applications
Figure from: Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 386
Diode
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Applications
Logic Gates
Figure from: Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 386
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Applications
Memory
Figures from: Chen, J., et al., Ann. N.Y. Acad. Sci. 960, (2002) 69
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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.
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References
1. Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 386
2. Reed, M. A., et al., Science 278, (1997) 252
3. Kushmerick, J. G., et al., Phys. Rev. Lett 89, (2002) 086802
4. Xiao, X., et al., Nano. Lett. 4, (2004) 267
5. Xu, B. Q.and N. J. Tao, Science 307, (2003) 1221
6. Chen, J., et al., Ann. N.Y. Acad. Sci. 960, (2002) 69