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A signal‐enhanced immunosensor has been developed by self‐assembling Au NPs onto a ferrocene‐branched poly(allylamine)/multiwalled carbon nanotubes (PAA‐Fc/MWNTs) modified electrode for the sensitive determination of hepatitis B surface antigen (HBsAg) as a model protein. The formation of PAA‐Fc/MWNTs composite not only effectively avoided the leakage of Fc and retained its electrochemical activity,...
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