Green Fabrication of Sulfonium‐Containing Bismuth Materials for High‐Sensitivity X‐Ray Detection
[(CH3CH2)3S]6Bi8I30 and [[(CH3CH2)3S]AgBiI5 are introduced as novel X-ray detector materials with exceptional sensitivity and low detection limits. Produced via scalable, green synthesis, they remain highly durable after 9 months of storage and continuous X-ray use, setting a new benchmark for medical imaging and outperforming many existing and emerging technologies.
Abstract
Organic–inorganic hybrid materials based on lead and bismuth have recently been proposed as novel X- and gamma-ray detectors for medical imaging, non-destructive testing, and security, due to their high atomic numbers and facile preparation compared to traditional materials like amorphous selenium and Cd(Zn)Te. However, challenges related to device operation, excessively high dark currents, and long-term stability have delayed commercialization. Here, two novel semiconductors incorporating stable sulfonium cations are presented, [(CH3CH2)3S]6Bi8I30 and [(CH3CH2)3S]AgBiI5, synthesized via solvent-free ball milling and fabricated into dense polycrystalline pellets using cold isostatic compression, two techniques that can easily be upscaled, for X-ray detection application. The fabricated detectors exhibit exceptional sensitivities (14 100–15 190 µC Gyair
−1 cm−2) and low detection limits (90 nGyair s−1 for [(CH3CH2)3S]6Bi8I30 and 78 nGyair s−1 for [(CH3CH2)3S]AgBiI5), far surpassing current commercial detectors. Notably, they maintain performance after 9 months of ambient storage. The findings highlight [(CH3CH2)3S]6Bi8I30 and [(CH3CH2)3S]AgBiI5 as scalable, cost-effective and highly stable alternatives to traditional semiconductor materials, offering great potential as X-ray detectors in medical and security applications.
April 11, 2025 at 09:54AM
https://advanced.onlinelibrary.wiley.com/doi/10.1002/adma.202418626?af=R
Allan Starkholm, Dominik Al‐Sabbagh, Sema Sarisozen, Alexander von Reppert, Matthias Rössle, Markus Ostermann, Eva Unger, Franziska Emmerling, Lars Kloo, Per H. Svensson, Felix Lang, Olena Maslyanchuk