Absorber of solar thermal collector, comprising the sensor, and process for its preparation.

Absorber solar collector comprising channels each with a first end and a second end, the first ends of the channels opening into a first end chamber and the second ends of the channels opening into the interior of second end chamber, wherein said absorber is constituted by a single extruded piece of a solid nanocomposite material comprising a polymeric matrix in which are incorporated nano-objects and / or nanostructures. Solar collector comprising said absorber and a transparent cover to the solar radiation, on said absorber. Process for the preparation of said absorber.