Figure 8.

Blood experiment results. Response of the CNT-biosensor at source-drain bias of 0.1 V and at the gate bias of 0 V. IL-6 spiked blood samples were tested on two different CNT-biosensor surfaces, IL-6 aptamer (A), and IgG (B) functionalized surfaces. The response of the IL-6 aptamer functionalized devices to control buffer, 1 mM MgCl₂ 1× PBS, is presented in each panel as a reference point (black marks). (A) Shows the respond of the IL-6 aptamer functionalized device to IL-6 protein spiked blood (10 pg/mL), ~8–13% drop in the current (diagnostic zone); (B) Presents the response to IgG functionalized CNT-biosensor, negative control surface, to IL-6 spiked blood showing no significant change in signal. Arrows indicate the points of IL-6 spiked blood injection, at 60 s.