Researchers from Bengaluru's Centre for Nano and Soft Matter Sciences have developed a novel sandwich of smart nano-materials that could help detect harmful chemicals, including explosives like TNT and RDX, even at trace levels, according to a government release. The multi-layer nanomaterial has reduced graphene oxide (rGO), silver nanoparticles (Ag) and cerium oxide (CeO₂) on a glass substrate.