Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 135, Issue 49, Pages 18331-18334Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja410656a
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Funding
- Center for Re-Defining Photovoltaic Efficiency Through Molecular-Scale Control, as Energy Frontier Research Center
- U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Science [DE-SC0001085]
- NSF [11-44155, CHE-11-52949]
- Semiconductor Research Corporation
- New York CAIST program
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1152949] Funding Source: National Science Foundation
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Here we demonstrate for the first time that strained silanes couple directly to gold electrodes in break-junction conductance measurements. We find that strained silicon molecular wires terminated by alkyl sulfide aurophiles behave effectively as single-molecule parallel circuits with competing sulfur-to-sulfur (low G) and sulfur-to-silacycle (high G) pathways. We can switch off the high conducting sulfur-to-silacycle pathway by altering the environment of the electrode surface to disable the Au-silacycle coupling. Additionally, we can switch between conductive pathways in a single molecular junction by modulating the tip-substrate electrode distance. This study provides a new molecular design to control electronics in silicon-based single molecule wires.
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