Unprotected terminal acetylenes form covalent bonding contacts with metal electrode surfaces

Charge transport at molecule-electrode interfaces using acetylene-terminated molecules. Surface-enhanced Raman spectroscopy spectra to show the covalent bonding of acetylene-terminated molecules on Au and Ag electrodes.

Scientific Achievement

Unprotected acetylene groups were found to form a simple new electrode-anchor pair (silver-acetylene) for forming robust, low resistance contacts for mediating or controlling molecule-electrode interactions.

Significance and Impact

This work highlights the importance of electrode-molecule interactions for mediating charge transport near the electrode surface. This work will facilitate an improved understanding of charge transport mechanisms and electron transfer rates for redoxmers in redox-active flow batteries.

Research Details

  • We report the spontaneous formation of robust and covalent metal-molecule linkages using acetylene-terminated oligophenyls with Ag electrodes, resulting in high-conducting molecular linkages with significantly lower contact resistance (6 kΩ) than those with acetylene-Au (36 kΩ), S-Au (40 kΩ), and amine-Au contacts (189 kΩ).
  • Different metal binding motifs result in lower Ag-C contact resistance compared to Au-C contacts

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DOI: 10.1021/acs.nanolett.0c02015

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