A sensitive enzymeless sensor for hydrogen peroxide based on the polynucleotide-templated silver nanoclusters/graphene modified electrode

► We fabricated the electrochemical sensor with simplicity and high sensitivity. ► DNA-AgNCs were simply synthesized and assembled onto graphene by π-π stacking. ► DNA-AgNCs possess enhanced electrocatalysis toward the reduction of H2O2. Graphene was electrodeposited onto the glassy carbon electrode. ► Graphene is useful for the immobilization of more DNA-AgNCs onto the electrode.