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Polyethyleneimine-reduced graphene oxide (PEI-RGO) nanocomposites were synthesized via the nucleophilic substitution reactions between the active amine groups in PEI and the surface-exposed epoxy groups in graphene oxide. The nanocomposites combining with nafion were used as the sensing material for the analysis of trace amount of Cu2+ in solution using differential pulse anodic stripping voltammetry...
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