ArticleACS omega2026
Counterion-Dependent Charge Transport in Ultrathin-Film Molecular Junctions.
Article in ACS omega, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
4 authors.
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Abstract
Counterions are ubiquitous in charged molecular films, yet their influence on charge transport in solid-state molecular junctions (MJs) remains insufficiently understood. Here, we investigate how embedded counterions regulate conductance in MJs based on ultrathin molecular films (2-9 nm) of 4,4'-Diamino-2,2'-stilbenedisulfonic acid (DAS). These DAS films were electrochemically grafted onto Au electrodes via in situ generated diazonium precursors. During film growth, cations from the supporting electrolyte are incorporated into the molecular network through electrostatic interactions with the sulfonate groups. The dense structure of the electro-grafted films enables direct deposition of Ti/Au top contacts, yielding robust large-area junctions with well-defined thicknesses. By varying the incorporated counterions (H
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