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PtAu/graphene nanocomposites (Pt:Au=1:1) were synthesized at room temperature. First, 0.249 mL H2PtCl6 (7.53 mg Pt mL-1 H2O) and 0.420 mL HAuCl4 (4.46 mg Au mL-1 H2O) were added into 200 mL of deionized H2O under vigorous stirring. A 150 mg of PDDA solution (35wt. % in H2O solution) was added to capture the PtCl6
2- and AuCl4- ions within the long chains of PDDA via the electrostatic interaction.

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