Figure 4

From: Graphene Quantum Dots Interfaced with Single Bacterial Spore for Bio-Electromechanical Devices: A Graphene Cytobot

Figure 4

(a) Transient response of the electrical current of the spore-pLGQD hybrid device with change in the local humidity. Multiple cycles of exposure of nitrogen (or helium) gas (30 s exposure time) at different bias voltages (0.05, 0.1 and 0.2 V) points towards the robustness, sensitivity, and fast response of the device. (b) The response of the electrical current in the percolating spore-pLGQD hybrid device at 0.25 V bias with the change in pressure (square points) is shown for a typical device. The model representing the combination of the Fowler-Nordheim electron tunneling and water-transport viamass-transfer model fits the data with a regression of 0.996(red curve). The model parameters obtained were used to plot the change in tunneling distances as a function of pressure (blue curve).