This title appears in the Scientific Report :
2015
Please use the identifier:
http://hdl.handle.net/2128/16832 in citations.
Please use the identifier: http://dx.doi.org/10.1063/1.4908252 in citations.
Noise characterization of metal-single molecule contacts
Noise characterization of metal-single molecule contacts
Noise spectra of molecule-free and molecule-containing mechanically controllable break junctions were investigated. The molecule-free junctions revealed typical 1/f noise characteristics. We studied three molecules as they bridged the electrodes: 11-mercaptoundecanoicacid, 1,8-octanedithiol, and 1,4...
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Personal Name(s): | Xiang, D. |
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Sydoruk, V. / Vitusevich, S. (Corresponding Author) / Petrychuk, M. V. / Offenhäusser, A. / Kochelap, V. A. / Belyaev, A. E. / Mayer, D. | |
Contributing Institute: |
JARA-FIT; JARA-FIT Bioelektronik; PGI-8 |
Published in: | Applied physics letters, 106 (2015) 6, S. 063702 |
Imprint: |
Melville, NY
American Inst. of Physics
2015
|
DOI: |
10.1063/1.4908252 |
Document Type: |
Journal Article |
Research Program: |
Controlling Configuration-Based Phenomena |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1063/1.4908252 in citations.
Noise spectra of molecule-free and molecule-containing mechanically controllable break junctions were investigated. The molecule-free junctions revealed typical 1/f noise characteristics. We studied three molecules as they bridged the electrodes: 11-mercaptoundecanoicacid, 1,8-octanedithiol, and 1,4-benzenedithiol, which possess different bonding strengths. For all of them, an additional Lorentzian-shape 1/f 2 noise component was registered with a characteristic frequency when the electrodes were bridged by an individual molecule. Measurements of time-dependent voltage fluctuations for the molecule-containing junctions bring out two-current state fluctuations, which in the frequency domain correspond to the 1/f 2 noise. Moreover, it is revealed that characteristic frequencies of these noise components are independent of molecule bonding strengths at the interface, but correlate with the molecule weights and current amplitudes in the lock-in state, in which the electrode gap is bridged by a single molecule. We attribute the noise monitored during charge transport through a molecular junction to the current induced molecular reconfigurations and suggest that the noise analysis can be used for characterization of metal-molecule coupling. |