ABSTRACT
The advantages of grating-based X-ray Differential Phase-Contrast Imaging (DPCI) in detecting the composite materials constituted by light elements have been demonstrated by many researchers. However, the fabrication of absorption gratings still remains a great challenge, especially large-area ones. In practice, the high-temperature micro-casting technique hinders the fabrication of such gratings due to the fragility and absorption homogeneity of large-area absorption gratings. Here, we propose and implement a novel fabrication method to avoid the high-temperature process. We use tungsten nanoparticles as an X-ray absorbing material, and insert them into the grating structures with carriers of organic solvent and emulsifying agent and the assistance of a negative-pressure process. In addition, we compare the X-ray projection absorbing contrast between two gratings with the same grating structure (period of 42 μm, depth of 150 μm) but fabricated by micro-casting and nanoparticle filling. Our research shows this method can provide lower-cost large-area absorption gratings, promoting the further development of DPCI.
