Z. J. Donhauser,1 B. A. Mantooth,1 K. F. Kelly,1 L. A. Bumm,1 J. D. Monnell,1 J. J. Stapleton,1 D. W. Price Jr.,2 D. L. Allara,1J. M. Tour,2 and P. S. Weiss1
1Department of Chemistry, The Pennsylvania State University, University Park, PA 16802-6300, USA
2Department of Chemistry and Center for Nanoscale Science and Technology, Rice University, Houston, TX 77005, USA
Movies of a number of inserted molecules recorded with the STM at high
gap impedance show stochastic switching of conductance. Supplementary
movies 1-3 show examples of several such movies. Movie 2 is particularly
illuminating in that disorder in the alkanethiolate matrix sweeps through
the lower region of the images. When this happens the switching rate
rises very dramatically and can no longer be tracked on the time scale
Movie 1 (3.2 MB)
Dodecanethiolate film with 4,4'-di(ethynylphenyl)-2'-nitro-1- benzenethiolate (2') inserted. Approximately 45% of the visible molecules undergo at least one switching event.
200 frames, 8.2 min/frame, Sample bias: +1.4 V, Current: 4.0 pA, 1500 Å x 1500 Å.
Total Time: Approx. 27 hr
Movie 2 (4.4 MB)
Dodecanethiolate film with 4,4'-di(ethynylphenyl)-1-benzenethiolate (1') inserted. Note the effect of matrix disorder on switching rate as the movie progresses.
240 frames, 5.0 min/frame, Sample bias: +1.0 V, Current: 1.0 pA, 1000 Å x 1000 Å.
Total Time: Approx. 20 hr.
Movie 3 (4.1 MB)
Dodecanethiolate film with 1' inserted. The film has been vapor annealed to reduce switching; note the stability of the inserted molecules.
200 frames, 5.3 min/frame, Sample bias: -1.0 V, Current: 1.0 pA, 1500 Å x 1500 Å.
Total Time: Approx. 18 hr.
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Last updated: May 8, 2001 zjd
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