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Non-Line-of-Sight Passive Ammonia Sensor Loaded With MXene/In2O3 Composites for Agricultural Products Quality
Guoping Hu1, Lin He1, Fanli Meng2
1School of Artificial Intelligence, Anhui Agricultural University, Hefei, Anhui, China.
Summary
A novel flexible passive radio-frequency identification (RFID) sensor enhances non-line-of-sight (NLoS) ammonia detection. This technology stabilizes detection by compensating for dielectric interference, enabling reliable food quality monitoring.
Area of Science:
- Materials Science
- Electrical Engineering
- Chemical Sensing
Background:
- Passive RFID sensors face challenges in non-line-of-sight (NLoS) sensing due to electromagnetic attenuation and reflection.
- Dielectric absorption and multipath effects degrade detection accuracy and stability in NLoS environments.
- Existing RFID sensors struggle with interference from dielectric materials, limiting their application in real-world scenarios.
Purpose of the Study:
- To develop a flexible passive RFID sensor for NLoS ammonia detection with improved accuracy and stability.
- To enhance the gas-sensitive properties of the RFID sensor using modified MXene materials.
- To mitigate the impact of NLoS dielectric interference on ammonia sensing performance.
Main Methods:
- Integration of a spiral antenna with an LC interdigital electrode for sensor fabrication.
- Modification of MXene with In2O3 nanoparticles to create an enhanced gas-sensitive layer.
- Implementation of structural separation between electromagnetic coupling and sensing functions.
- Development of an S11 amplitude-frequency signal separation strategy for interference decoupling.
Main Results:
- The developed sensor demonstrated significant response under NLoS dielectric interference (Δ|S11| = 9.19 dB).
- An ammonia-induced resonance frequency shift of Δ|f| = 0.48 MHz was observed.
- The proposed signal separation strategy effectively decoupled dielectric interference signals from gas-induced signals.
- Dielectric interference compensation stabilized frequency shifts and suppressed interference under specific environmental conditions (25°C, 40% RH).
Conclusions:
- The flexible passive RFID sensor with In2O3-modified MXene offers enhanced NLoS ammonia detection capabilities.
- The S11 amplitude-frequency signal separation strategy effectively compensates for dielectric interference.
- This technology enables reliable, rapid, and nondestructive detection of quality deterioration in sealed fresh-food packaging.
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