Fig. 4: The cTnI assay with sub-femtomolar sensitivity on Au nanorod substrates.
a Conceptual illustration of the cTnI assay performed on Au nanorod arrays. b Dilution plot of fluorescent intensity against the concentration of target cTnI on both Au nanorod arrays (red triangles) and reference glass plates (inset, blue squares). The curves were fitted to a five-parameter logistic nonlinear regression model with an excellent agreement (R2 = 0.998). The error bars indicate the standard errors of the respective mean values based on five measurements
