The graphene is one of the most popular materials of our age since its discovery. The graphene and its derivatives have gained much attention in sensor applications because of its features (e.g., electronic conductivity, specific surface area, etc.). However, the coating of graphene is challenging for the researchers especially for Si/SiO2 surfaces due to its surface tension. Many researchers tend to use chemical materials for the coating rGO onto Si/SiO2 such as APTES, TEOS, PEG, HMDS etc. For the purpose, we discovered a novel type ultrasonic-assisted coating method for sensor applications which can be done using any chemicals. To do so, we firstly produced reduced graphene oxide (rGO) from graphite by using Hummer’s method and chemical reduction process. Then, we prepared Si/SiO2 samples and put them into plastic container. After that, we put samples into ultrasonic bath and dropped rGO suspension onto samples by using with micro-pipette. After that, the rGO coated samples were dried on hot plate at 100°C. The results showed high potential that rGO can be coated onto Si/SiO2 surfaces with low-cost solution.

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