Abstract
The linear carbon allotrope carbyne has been predicted to display outstanding electrical and mechanical properties, but its preparation and characterisation are hindered by synthetic challenges. Whilst oligoyne and cumul[n]ene models of carbyne have been explored, the end-groups employed to avoid decomposition have a profound effect on their electronic configuration. Here, we show that transmetallation of linear carbon fragments from bulky Au(I) species to Au(0) electrodes delivers stable Au|CCCC…|Au devices. Scanning tunnelling microscope break junction (STMBJ) techniques were used to characterise charge-transport behaviour in these 1D chains (4 − 16 carbon atoms) free of end-capping groups. Shorter chains exhibited oligoyne structures with conductance attenuation as a function of length, while longer chains show evidence of cumulenic equalisation and remarkably enhanced charge-transport. Direct Au|C interfaces grant high conductance and quasi-ballistic transport to 1D carbon chains, providing a pathway to advanced carbon-based nanoelectronics based on the stabilisation of carbyne within the junction environment.
Supplementary materials
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Supplementary Information
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Methods, synthetic details, and further experiments.
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