Passive RFID microstrip photosensitive sensor based on TiO2/rGO/CuO composite

Abstract

In this paper, a passive RFID microstrip antenna photosensor based on titanium dioxide (TiO2)/reduced graphene oxide (rGO)/copper oxide (CuO) nanocomposite was designed and fabricated for monitoring light intensity in the environment. The microstrip patch antenna with slot is designed by HFSS simulation, the actual antenna is prepared by the engraving machine, and the photosensitive RFID sensor is prepared by coating the nano-material on the antenna by drop coating. The amplitude of ambient light intensity is determined in the frequency band of 2.082 GHz–2.087 GHz. To study its performance, the sensor coated with the sensitive material was tested under a solar simulator. The results show that from the dark environment (0 klx)-32.9 klx light intensity, the sensitivity of the photosensor is 0.106 ± 0.03 db/klx, and the sensitivity is 0.784 ± 0.08 db/klx under the light intensity of 36.8–53.9 klx. The response time of the photosensor was 20.1 s and the recovery time was 30.3 s in the light intensity range of 0–53.9 klx, indicating that the TiO2/rGO/CuO composite has good responsiveness and repeatability as a photosensitive material.