NIST researchers built DNA origami hinges that change shape when they bind a target molecule. The motion shifts charge near an electrode, producing a much larger electrical signal than direct DNA hybridization alone.

The work was published in Nanoscale, and the cover illustration was selected for the journal issue.

The cover image turns the hinge into a close, chip-scale scene: blue DNA arms, a small binding strand, and an electrical glow from the surface below. The supporting diagram and animation explain the mechanism more directly, showing the hinge geometry, lock motif, and opening motion.