Resistive and Capacitive γ-Ray Dosimeters Based On Triggered Depolymerization in Carbon Nanotube Composites

Area of Science:

• Materials Science
• Nanotechnology
• Radiation Detection

Background:

• Metastable poly(olefin sulfone)s (POSs) are polymers that degrade upon exposure to ionizing radiation.
• Single-walled carbon nanotubes (SWCNTs) possess unique electronic properties suitable for sensor applications.

Purpose of the Study:

• To develop novel gamma-ray dosimeters utilizing SWCNTs wrapped with POSs.
• To investigate the real-time detection capabilities of these organic-based radiation sensors.

Main Methods:

• Synthesis and characterization of new POSs designed for SWCNT wrapping.
• Fabrication of resistive device platforms incorporating POS-SWCNT composites.
• Evaluation of the radiation-induced changes in electronic potential and resistance.

Main Results:

• POS-SWCNT composites demonstrated immediate changes in electronic potential upon gamma-ray exposure due to polymer degradation.
• Device resistance decreased by up to 65% after a 40 krad dose, indicating high sensitivity.
• Sensor performance was influenced by polymer stability, gamma-ray opacity, and SWCNT dispersion.

Conclusions:

• POS-SWCNT composites offer a promising new transduction material for gamma-ray sensing.
• The developed dosimeters provide a sensitive, low-power, and cost-effective solution for real-time radiation detection.
• This work highlights the potential of organic-based materials in advanced radiation detection technologies.