Cumulene Wires Display Increasing Conductance with Increasing Length
- Columbia University, New York, NY (United States); Chinese Academy of Sciences (CAS), Beijing (China); Columbia University
- Columbia University, New York, NY (United States)
- Columbia University, New York, NY (United States); Shanghai University of Electric Power (China)
- Shanghai University of Electric Power (China)
One-dimensional sp-hybridized carbon wires, including cumulenes and polyynes, can be regarded as finite versions of carbynes. They are likely to be good candidates for molecular-scale conducting wires as they are predicted to have a high-conductance. In this study, we first characterize the single-molecule conductance of a series of cumulenes and polyynes with a backbone ranging in length from 4 to 8 carbon atoms, including [7]cumulene, the longest cumulenic carbon wire studied to date for molecular electronics. We observe different length dependence of conductance when comparing these two forms of carbon wires. Polyynes exhibit conductance decays with increasing molecular length, while cumulenes show a conductance increase with increasing molecular length. Their distinct conducting behaviors are attributed to their different bond length alternation, which is supported by theoretical calculations. Furthermore, this study confirms the long-standing theoretical predictions on sp-hybridized carbon wires and demonstrates that cumulenes can form highly conducting molecular wires.
- Research Organization:
- Columbia University, New York, NY (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); Natural Science Foundation of Shanghai; USDOE
- Grant/Contract Number:
- SC0019440
- OSTI ID:
- 2202959
- Alternate ID(s):
- OSTI ID: 1853249
- Journal Information:
- Nano Letters, Journal Name: Nano Letters Journal Issue: 11 Vol. 20; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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