Simultaneous Local Heating/Thermometry Based on Plasmonic Magnetochromic Nanoheaters

Area of Science:

• Nanotechnology
• Biomedical Engineering
• Materials Science

Background:

• Accurate real-time control of nanotherapies is crucial for minimizing damage to healthy tissues.
• Local thermal therapies require precise monitoring of temperature variations.
• Existing nanothermometers face limitations in sensitivity and efficiency.

Purpose of the Study:

• To develop a novel nanoheater/thermometer concept for precise control in nanotherapies.
• To utilize magnetoplasmonic nanodomes for simultaneous heating and temperature sensing.
• To demonstrate real-time monitoring of thermal effects and viscosity changes.

Main Methods:

• Fabrication of magnetoplasmonic (Co/Au or Fe/Au) nanodomes.
• Utilizing optical monitoring of magnetic-induced rotation for temperature detection.
• Measuring phase lag between optical signal and magnetic field for viscosity sensing.

Main Results:

• Magnetoplasmonic nanodomes exhibit efficient plasmonic heating and sensitive temperature detection (0.05 °C).
• The system accurately detects viscosity variations (detection limit 0.0016 mPa s).
• Real-time monitoring of viscosity reduction induced by optical heating was achieved, even in complex cell dispersions.

Conclusions:

• Magnetoplasmonic nanodomes offer a promising platform for advanced nanotherapies.
• The technology provides superior optical stability, heating efficiency, and cost-effectiveness compared to existing methods.
• This nanotechnology holds significant biomedical potential for targeted thermal treatments.