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Graphene electrodes are promising candidates to improve reproducibility andstability in molecular electronics through new electrode-molecule anchoringstrategies. Here we report sequential electron transport in few-layer graphenetransistors containing individual curcuminoid-based molecules anchored to theelectrodes via pi-pi orbital bonding. We show the coexistence of inelasticco-tunneling excitations with single-electron transport physics owing to anintermediate molecule-electrode coupling; we argue that an intermediateelectron-phonon coupling is the origin of these vibrational-assistedexcitations. These experimental observations are complemented with densityfunctional theory calculations to model electron transport and the interactionbetween electrons and vibrational modes of the curcuminoid molecule. We findthat the calculated vibrational modes of the molecule are in agreement with theexperimentally observed excitations.

Sequential electron transport and vibrational excitations in an organic molecule coupled to few-kayer graphene electrodes