article published yes Yaping Zang author Tianren Fu author Qi Zou author Fay Ng author Hexing Li author Michael L. Steigerwald author Colin Nuckolls author Latha Venkataraman author 9ebb78a5-cc0d-11ee-8322-fae086a32caf0000-0002-6957-6089 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. This study confirms the long-standing theoretical predictions on sp-hybridized carbon wires and demonstrates that cumulenes can form highly conducting molecular wires. American Chemical Society2020 eng 1530-6984 1530-6992 3309502110.1021/acs.nanolett.0c03794 20118415-8419 yes Zang Y, Fu T, Zou Q, Ng F, Li H, Steigerwald ML, Nuckolls C, Venkataraman L. 2020. Cumulene wires display increasing conductance with increasing length. Nano Letters. 20(11), 8415–8419. Zang, Yaping, Tianren Fu, Qi Zou, Fay Ng, Hexing Li, Michael L. Steigerwald, Colin Nuckolls, and Latha Venkataraman. “Cumulene Wires Display Increasing Conductance with Increasing Length.” <i>Nano Letters</i>. American Chemical Society, 2020. <a href="https://doi.org/10.1021/acs.nanolett.0c03794">https://doi.org/10.1021/acs.nanolett.0c03794</a>. Zang Y, Fu T, Zou Q, et al. Cumulene wires display increasing conductance with increasing length. <i>Nano Letters</i>. 2020;20(11):8415-8419. doi:<a href="https://doi.org/10.1021/acs.nanolett.0c03794">10.1021/acs.nanolett.0c03794</a> Y. Zang, T. Fu, Q. Zou, F. Ng, H. Li, M.L. Steigerwald, C. Nuckolls, L. Venkataraman, Nano Letters 20 (2020) 8415–8419. Zang, Yaping, et al. “Cumulene Wires Display Increasing Conductance with Increasing Length.” <i>Nano Letters</i>, vol. 20, no. 11, American Chemical Society, 2020, pp. 8415–19, doi:<a href="https://doi.org/10.1021/acs.nanolett.0c03794">10.1021/acs.nanolett.0c03794</a>. Y. Zang <i>et al.</i>, “Cumulene wires display increasing conductance with increasing length,” <i>Nano Letters</i>, vol. 20, no. 11. American Chemical Society, pp. 8415–8419, 2020. Zang, Y., Fu, T., Zou, Q., Ng, F., Li, H., Steigerwald, M. L., … Venkataraman, L. (2020). Cumulene wires display increasing conductance with increasing length. <i>Nano Letters</i>. American Chemical Society. <a href="https://doi.org/10.1021/acs.nanolett.0c03794">https://doi.org/10.1021/acs.nanolett.0c03794</a> 179062024-09-09T07:16:20Z2024-12-10T10:41:40Z