S. Kang, A. F. Nieuwenhuis, K. Mathwig, D. Mampallil and S. G. Lemay
Electrochemical Single-Molecule Detection in Aqueous Solution using Self-Aligned Nanogap Transducers
ACS Nano 7 (2013) 10931.
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Electrochemical detection of individual molecular tags in nanochannels may enable cost effective, massively parallel analysis and diagnostics platforms. Here we demonstrate single-molecule detection of prototypical analytes in aqueous solution based on redox cycling in 40 nm nanogap transducers. These nanofluidic devices are fabricated using standard microfabrication techniques combined with a self-aligned approach that minimizes gap size and dead volume. We demonstrate the detection of three common redox mediators at physiological salt concentrations.