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A reusable and label-free supersandwich biosensor was constructed for sensitive DNA detection by immobilizing target-triggered DNA concatamers with redox-active intercalators on ternary self-assembled monolayer (TSAM). Interestingly, the target DNA (T-DNA) could hybridize with the inert dumbbell-shaped DNA (D-DNA) to form a duplex DNA containing two sticky termini. The duplex DNA was then hybridized...
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