Graphene oxide-enabled tandem signal amplification for sensitive SPRi immunoassay in serum†
Abstract
A tandem signal amplification using bioconjugated graphene oxide and subsequent silver catalytic deposition for surface plasmon resonance imaging (SPRi) to sensitively and specifically immunoassay tumor biomarkers in serum, achieving a limit of detection down to 100 pg mL−1 with a broad dynamic range for α-Fetoprotein (AFP) is reported.