Fluorescent detection of hydrogen peroxide and glucose with polyethyleneimine-templated Cu nanoclusters.

Highlights: [•] Cu nanoclusters with size smaller than 2nm was utilized as a fluorescence probe. [•] The lable-free method had good selectivity, low toxicity, and low cost. [•] Cu nanoclusters using polyethyleneimine as a template possessed good stability. [•] Water-soluble Cu nanoclusters had been applied successfully in human serum sample. [Copyright &y& Elsevier]