Harnessing Quantum Capacitance in 2D Material/Molecular Layer Junctions for Novel Electronic Device Functionality

The stearic acid was produced by dissolving stearic acid (1 mg) in hexane (1 mL) and then compressed using the Langmuir–Blodgett through from KSV NIMA Instruments (Biolin Scientific, Vastra Frolunda, Sweden). By spreading the hexane solution of stearic acid of 80 μL by using a microsyringe (Hamilton Company Inc. , Reno, NV, USA) on DI water with a resistivity ≥18. 2 MΩ cm, the monolayers were formed. The isothermal compression rate was maintained at 10 mm/min, and once the desired surface tension was achieved, the monolayer was allowed to equilibrate for about 5 min. Then, we employed the LB deposition technique to transfer a single layer or multilayer of stearic acid on the substrate (graphene over SiO
2
wafer) through withdrawing them vertically out of the subphase at the rate of 5 mm/min. The quality, structure, and behavior studies of the monolayer were performed with a KSV NIMA Micro-BAM Brewster Angle Microscope (Biolin Scientific, Biolin Scientific, Vastra Frolunda, Sweden). A Wilhelmy plate was used to measure the surface pressure.