4.8 Thermal biosensors 109 electrolyte Macrophage passivation Au Au SiO 2 FIGURE 4.9 Suspended CNT sensor interfacing with a macrophage cell (adapted from [28]) the cell's membrane [28]. In an interesting recent experiment by the Cees Dekker's group at Delft University, a suspended CNT FET sensor was used to monitor a macrophage. (Macrophages play an