Figure 2.

OECT-based sucrose and glucose sensors

(A) Schematic of the OECT-based sucrose sensor. Gate (area = 300 μm ∗ 300 μm) is functionalized with three enzymes in order for sucrose to be converted to H₂O₂ that can then be oxidized at the PtNPs that are on the gate electrode.

(B) Typical transfer curve and transconductance of OECT device after functionalization with PtNPs for V_SD = −0.4V and V_SG from −0.2V to 1V.

(C) Sucrose sensor (orange) and glucose sensor (cyan) calibration curve in PBS buffer. Dashed lines represent fit to the sigmoidal function. Error bars represent the standard error, n = 8 devices for sucrose sensor and n = 5 devices for glucose sensor.

(D) Sucrose sensor response after 48hr of insertion in the tree for 100 μM and 300μM sucrose solutions (blue error bars represent the standard error for n = 3). In orange, the sucrose sensor calibration curve is shown for comparison. T test showed no statistical significance (p > 0.05) on the response of the sensors before and after 48hr implantation.