Temperature Sensor Based on Surface Plasmon Resonance with TiO₂-Au-TiO₂ Triple Structure.

Area of Science:

• Nanotechnology
• Sensors and Sensing
• Materials Science

Background:

• Surface plasmon resonance (SPR) sensors are crucial for various applications.
• Research on SPR-based temperature sensors remains limited.
• Developing advanced temperature sensors is essential for daily life and industrial processes.

Purpose of the Study:

• To propose and optimize a novel SPR temperature sensor.
• To investigate the impact of a TiO2/Au/TiO2 nanostructure on sensor performance.
• To enhance the sensitivity and detection resolution of SPR temperature sensors.

Main Methods:

• Fabrication of a triple-layer SPR sensor comprising TiO2 film, Au film, and TiO2 nanorods.
• Optimization of the thicknesses and structures of the TiO2 and Au layers.
• Characterization of the sensor's response to temperature variations.

Main Results:

• The optimized SPR temperature sensor achieved a sensitivity of 6038.53 nm/RIU.
• The sensor exhibited a detection temperature sensitivity of -2.40 nm/°C.
• A linear correlation (R² > 0.99) was observed between temperature and resonance wavelength from 0 °C to 60 °C.

Conclusions:

• The proposed TiO2(film)-Au-TiO2(nanorods) structure significantly enhances SPR sensor sensitivity.
• The optimized sensor demonstrates high sensitivity, FOM, and detection resolution.
• This SPR sensor shows promising potential for accurate temperature monitoring applications.