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The fluorescence of Rhodamine B (RhB) could be quenched by the manner of photo-induced electron transfer with Cu2-xSe nanoparticles as the energy receptor and RhB as the energy donor. However, L-cysteine (L-Cys) was capable of recovering the fluorescence of Rhodamine B, and the recovered fluorescence intensity was proportional to the concentrations of L-Cys. Based on that, a novel method for detecting...
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