Publications

Proposed for publication in the Lab On A Chip.

Lee, Eunice S.; Robinson, David R.; Rognlien, Judith L.; Simmons, Blake S.; Dentinger, Paul M.; Davalos, Rafael V.

Abstract not provided.

Leonard, Francois L.; Talin, A.A.; Dentinger, Paul M.; Jones, Frank E.

Abstract not provided.

Dentinger, Paul M.; Wu, Janson W.; Lee, Eunice S.; Lindblom, Scott C.; Skinner, J.L.; Gianoulakis, Steven E.; Strong, Fabian W.; Bochenski, Edwin B.

Abstract not provided.

Dentinger, Paul M.; Leonard, Francois L.; Talin, A.A.

DNA-wrapped carbon nanotubes (DNA-CNT) have generated attention due the ability to disperse cleanly into solution, and by the possibility of sorting nanotubes according to size and conductivity. In order to learn more about the effects of DNA on the electrical transport characteristics of single wall carbon nanotubes, we fabricate and test a series of devices consisting of DNA-wrapped CNTs placed across gold, palladium, and palladium oxide electrodes. In addition, we look at how DNA functionalized CNTs react to presence of hydrogen, which has previously been shown to affect the conductivity of CNTs when in contact with palladium.

Applied Physics Letters

Léonard, F.; Jones, Frank E.; Talin, A.A.; Dentinger, Paul M.

We present experimental observation and theoretical analysis of looping carbon nanotubes connecting two electrodes. The measured conductance of the nanotubes is not strongly affected by the presence of these conformational defects, a result that is confirmed by quantum transport calculations. Our work indicates that solution-based fabrication methods for carbon nanotube devices can have high conformational defect tolerance, except for defects with 5-10 nanometer bending radius. © 2005 American Institute of Physics.

Dentinger, Paul M.; Leonard, Francois L.; Talin, A.A.

Abstract not provided.

Proposed for publication in Applied Physics Letters.

Jones, Frank E.; Leonard, Francois L.; Dentinger, Paul M.; Cliff, Miles

Abstract not provided.

Proposed for publication in Journal of Vacuum Science and Technology B.

Dentinger, Paul M.; Pathak, Srikant P.; Jones, Frank E.; Hunter, Lucas L.; Leonard, Francois L.; Morales, Alfredo M.

In this article we report on the electrical characteristics of single wall carbon nanotubes (SWCNTs) wrapped with single-stranded deoxyribonucleic acid (ssDNA). We fabricate these devices using a solution-based method whereby SWCNTs are dispersed in aqueous solution using 20-mer ssDNA, and are placed across pairs of Au electrodes using alternating current dielectrophoresis (ACDEP). In addition to current voltage characteristics, we evaluate our devices using scanning electron microscopy and atomic force microscopy. We find that ACDEP with ssDNA based suspensions results in individual SWCNTs bridging metal electrodes, free of carbon debris, while similar devices prepared using the Triton X-100 surfactant yield nanotube bundles, and frequently have carbon debris attached to the nanotubes. Furthermore, the presence of ssDNA around the nanotubes does not appear to appreciably affect the overall electrical characteristics of the devices. In addition to comparing the properties of several devices prepared on nominally clean Au electrodes, we also investigate the effects of self-assembled monolayers of C{sub 14}H{sub 29}-SH alkyl thiol and benzyl mercaptan on the adhesion and electrical transport across the metal/SWCNT/metal devices.