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We report a sensitive sensing strategy based on metal-enhanced fluorescence (MEF) and hybridization chain reaction (HCR). Hg2+ aptamers were immobilized on magnetic nanoparticles (NPs) and HCR process happened without Hg2+, forming long DNA chains and allowing fluorescent indicator (SYBR Green) intercalated in the double helix. After magnetic separation from test solution, positively charged Ag@SiO...
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