Several nanomaterials are known for their enhanced reactivity: - Gold Nanoparticles: These are used in catalysis and medical applications due to their unique optical and chemical properties. - Titanium Dioxide Nanoparticles: Widely used in photocatalysis for environmental cleanup and in sunscreens due to their UV-absorbing properties. - Carbon Nanotubes: Known for their electrical conductivity and mechanical strength, they are used in composite materials and electronic devices.