Reversible bistable switching in nanoscale thiol-substituted oligoaniline molecular junctions |
| |
Authors: | Cai Lintao Cabassi Marco A Yoon Heayoung Cabarcos Orlando M McGuiness Christine L Flatt Austen K Allara David L Tour James M Mayer Theresa S |
| |
Affiliation: | Department of Electrical Engineering and Department of Chemistry and Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA. |
| |
Abstract: | Single molecular monolayers of oligoaniline dimers were integrated into sub-40-nm-diameter metal nanowires to form in-wire molecular junctions. These junctions exhibited reproducible room temperature bistable switching with zero-bias high- to low-current state conductance ratios of up to 50, switching threshold voltages of approximately +/-1.5 V, and no measurable decay in the high-state current over 22 h. Such switching was not observed in similarly fabricated saturated dodecane (C12) or conjugated oligo(phenylene ethynylene) (OPE) molecular junctions. The low- and high-state current versus voltage was independent of temperature (10-300 K), suggesting that the dominant transport mechanism in these junctions is coherent tunneling. Inelastic electron tunneling spectra collected at 10 K show a change in the vibrational modes of the oligoaniline dimers when the junctions are switched from the low- to the high-current state. The results of these measurements suggest that the switching behavior is an inherent molecular feature that can be attributed to the oligoaniline dimer molecules that form the junction. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|