Figure 1.

A modern biosensor system. (a) Schematic of the sensor with receptors functionalized to the surface. (b) Top view of the sensor shown in (a). Receptor molecules are shown as solid dots. The random sequential attachment of receptors introduces voids (open circles) of varying sizes on sensor surface over which parasitic adsorption can occur (illustrated as shaded dots in the void A). (c) Cross-section of a sensor system illustrating the various components that contribute towards Selectivity.