Design of passive coding RFID sensor tags for smart agriculture based on RGO-TiO₂-SWCNT electrode

Area of Science:

• Materials Science
• Sensor Technology
• Environmental Monitoring

Background:

• Development of advanced sensor materials is crucial for precise environmental monitoring.
• Composite materials offer unique properties for enhanced sensor performance.
• Radio Frequency Identification (RFID) technology provides a platform for passive sensing.

Purpose of the Study:

• To investigate a novel passive RFID tag sensor.
• To evaluate its capability in measuring light intensity and carbon dioxide (CO2) concentration.
• To assess the sensor's stability, repeatability, and responsiveness.

Main Methods:

• Fabrication of an RFID tag sensor using a composite of titanium dioxide (TiO2)/single-walled carbon nanotubes (SWCNT)/reduced graphene oxide (RGO).
• Testing the sensor's response to varying light intensities (4–18.1 klx).
• Testing the sensor's response to different CO2 concentrations (700–1900 ppm).

Main Results:

• The RFID tag exhibited a signal loss of -21.88 dB under light illumination.
• Light intensity response and recovery times were 9.8 s and 19.2 s, respectively.
• A frequency shift of 124 MHz was observed with CO2 concentration changes, with response/recovery times of 5.2 s and 18.4 s.

Conclusions:

• The developed TiO2/SWCNT/RGO composite RFID sensor demonstrates excellent stability, repeatability, and responsiveness.
• This sensor is a promising candidate for accurate, real-time monitoring of light intensity and CO2 levels.
• The passive nature of the RFID tag simplifies potential integration into various monitoring systems.