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A facile and sensitive mediator-free electrochemical immunosensor for detection of alpha-fetoprotein (AFP) was designed by using nanosilver-coated silica nanoparticles (Ag-SiO 2 ) as bionanolabels. To construct such an electrochemical immunosensor, silver ions/single-stranded DNA/graphene nanosheets were initially immobilized on a gold electrode in turn, then silver ions were in situ reduced...
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