Add 6.75 g, 10.125 g, and 13.5 g MoS2 nanoparticles to the solution and ultrasonic for 20 min. Inject the composite material solution 80–200 uL onto a silicon substrate (10 mm × 10 mm)cleaned with alcohol, acetone, and isopropanol by using micropipette.
Allow the solution to stand in an environment at 25 °C ± 2 °C and 60 RH ± 5% for 1 h.