Researchers have developed a new class of flexible neutron converter foils, fabricated via a solution-based process. These foils, based on a silicon polymer doped with gadolinium oxide (Gd₂O₃) particles, offer a promising alternative to traditional neutron detectors, which are often rigid, expensive, and rely on helium-3 (³He), a scarce and costly isotope. The flexibility and low-cost manufacturing method open new avenues for neutron detection in various applications.

The design of these foils focuses on maximizing conversion efficiency and spatial resolution. Gadolinium is a material with a high neutron capture cross-section, making it ideal for this application. By doping a silicon polymer with Gd₂O₃ nanoparticles, a matrix is created that can capture neutrons and, through the beta decay of gadolinium-155 and gadolinium-157, emit conversion electrons. These electrons can then be detected by sensitive devices, translating the presence of neutrons into an electrical or light signal. The novelty lies in the ability to process these materials in solutions, allowing for the fabrication of thin, conformable films.

Solution processing enables the production of these foils at a large scale and at a significantly lower cost than current methods. Furthermore, the inherent flexibility of polymers allows these converters to conform to curved or irregular surfaces, expanding their range of application. This is crucial for fields such as security, nuclear reactor monitoring, neutron imaging in medicine, or materials research, where detector shape and cost are limiting factors. The ability to adjust the Gd₂O₃ concentration and film thickness allows for optimization of the converter's properties for different detection requirements.