Layered MnO₂ nanosheet as a label-free nanoplatform for rapid detection of mercury(II).

A layered MnO2 nanosheet was established as a label-free fluorescent sensing platform for a rapid, sensitive and low-cost detection of mercury(II) ion in aqueous solution based on the target-induced conformational change of mercury-specific oligonucleotide (MSO) and the interactions between the fluorogenic MSO probe and MnO2 nanosheet.