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A 'turn-on' fluorescence method for detection of hydrogen peroxide (H2 O2 ) in marine food samples is presented in this article. Using this method, a carbon dots (CDs)-MnO2 probe was formed in which fluorescence intensity (FI) of CDs was quenched through fluorescence resonance energy transfer by addition of MnO2 nanosheets. When H2 O2 was added into the CDs-MnO2 solution, the MnO2 nanosheets formed Mn2+ ions due to a redox reaction between H2 O2 and MnO2 nanosheets, and CD FI was recovered. Under optimized conditions, the detection limi