Synthesis of soluble polyimide/silica-titania core-shell nanoparticle hybrid thin films for anti-reflective coatings

▶ HRTEM and HRSEM images showed that the size of the core-shell nanoparticles was 18-20 nm. The thickness of titania shell on the silica is about 2.5 nm. ▶ The prepared hybrid films had good optical properties and a high refractive index of 1.735. ▶ The reflectance of the three layer antireflective (AR) coating on the glass and PMMA substrate at 550 nm was 0.356 and 0.495%, respectively. The transparency was greater than 90% for both AR coatings on the glass and PMMA substrates.