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Polymer-BiI3 composites for high-performance, room-temperature, direct X-ray detectors
Ritu Chaudhari1, Chhaya Ravi Kant1, Alka Garg2
1Department of Applied Sciences and Humanities, Indira Gandhi Delhi Technical University for Women, Kashmere Gate, Delhi, 110006 India.
MRS Communications
|May 2, 2022
Summary
Stable PMMA/polystyrene-BiI3 composites were synthesized for direct X-ray detector applications. The PS-BiI3 composite shows high signal-to-noise ratio, sensitivity, and fast response time for low-energy X-ray detection.
Area of Science:
- Materials Science
- Medical Physics
Background:
- Low-energy X-rays are crucial for medical diagnostics, with demand increasing.
- Development of efficient direct X-ray detectors is essential for advanced medical imaging.
Purpose of the Study:
- To synthesize stable PMMA/polystyrene-BiI3 composites for direct X-ray detector applications.
- To evaluate the performance of these composites under low-energy X-ray irradiation.
Main Methods:
- Facile, low-cost, dry-tumble mixing technique for composite synthesis.
- Comparative analysis of structural, optical, and photocurrent responses.
- Irradiation with low-energy X-rays (30 and 60 kV) at a dose rate of 1.68 mGy s-1.
Main Results:
- Polystyrene-Bismuth Iodide (PS-BiI3) composite demonstrated high signal-to-noise ratio (SNR) of 3300.
- Achieved high sensitivity of 189 µC Gy-1 cm-3.
- Exhibited a fast response time of 30 ms.
Conclusions:
- The synthesized PS-BiI3 composite is a promising candidate for low-energy, room-temperature, direct X-ray detectors.
- The material operates effectively under low bias conditions.
- The facile synthesis method offers a cost-effective approach for detector fabrication.
