S. Kang, A. F. Nieuwenhuis, K. Mathwig, D. Mampallil, Z. A. Kostiuchenko and Serge G. Lemay, Faraday Discussions 193 (2016) 41.

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The diffusive mass transport of individual redox molecules was probed experimentally in microfabricated nanogap electrodes. The residence times for molecules inside a well-defined detection volume were extracted and the resulting distribution was compared with quantitative analytical predictions from random-walk theory for the time of first passage. The results suggest that a small number of strongly adsorbing sites strongly influence mass transport at trace analyte levels.