Smart nanomaterials are materials made up of particles that are within the nanoscale range (1-100nm). They are designed to have properties that can be manipulated to respond to external stimuli such as temperature, light, and chemicals. Smart nanomaterials have applications in fields such as energy, health, and environment. In energy, they can be used to develop efficient solar cells. In health, they can be used to diagnose and treat diseases. In the environment, they can be used to create sensors for water and air pollution.