Molecular ConductorsMolecular Conductor Quick Intro.Polyphenylene-based moleculesMechanically Controlled Break-Junction MethodSlide 5Crossed-Wire MethodSlide 7STM Break-Junction MethodSlide 9Conductance SummaryApplicationsSlide 12Slide 13SummaryReferences1Molecular ConductorsBy: Adam Krause4/17/07Physics 6722Molecular Conductor Quick Intro.Two types of molecules: carbon nanotubes and polyphenylene-based moleculesMultiple approaches to conductance experimentsMolecular conductors as applied to molecular electronics3Polyphenylene-based moleculesFigure adapted from: Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 3864Mechanically Controlled Break-Junction MethodFigures from: Reed, M. A., et al., Science 278, (1997) 252 Benzene-1,4-dithiolate5Mechanically Controlled Break-Junction MethodBenzene-1,4-dithiolateFigures from: Reed, M. A., et al., Science 278, (1997) 2526Crossed-Wire MethodOligo(phenylene ethynylene)Figure from: Kushmerick, J. G., et al., Phys. Rev. Lett 89, (2002) 0868027Crossed-Wire MethodOligo(phenylene ethynylene)Figure from: Kushmerick, J. G., et al., Phys. Rev. Lett 89, (2002) 0868028STM Break-Junction MethodMany Thiolated Molecules Used Figure from: Xiao, X., et al., Nano. Lett. 4, (2004) 2679STM Break-Junction MethodFigure from: Xu, B. Q.and N. J. Tao, Science 307, (2003) 1221 Many Thiolated Molecules Used10Conductance SummaryThe 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 molecule11ApplicationsFigure from: Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 386Diode12ApplicationsLogic GatesFigure from: Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 38613ApplicationsMemoryFigures from: Chen, J., et al., Ann. N.Y. Acad. Sci. 960, (2002) 6914SummaryThe 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.15References1. Ellenbogen, J. C. and J. C. Love, Proceedings of the IEEE, Vol. 88 No. 3, (2000) 3862. 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)
View Full Document
Unlocking...