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An ultrasensitive electrochemical biosensor for detecting microRNAs is fabricated based on hollow molybdenum disulfide (MoS2) microcubes. Duplex-specific nuclease, enzyme and electrochemical–chemical–chemical redox cycling are used for signal amplification. Hollow MoS2 microcubes constructed by ultrathin nanosheets are synthesized by a facile template-assisted strategy and used as supporting substrate...
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