Solar energy harvesting based on photo-thermal conversion gains a considerable interest but faces a major challenge. The selective solar absorbers, which enable the conversion of sunlight into heat while minimizing the radiative heat loss, are pivotal in this perspective. The high operating temperature is a condition to reach high conversion efficiencies, but the currently available approaches to perform selective absorption are not able to combine sufficiently viable structural stability, thermo-optical performance and up-scalability to enable operation temperatures above 500 °C. Being the darkest known materials, the carbon nanotubes (CNTs) feature an outstanding thermal stability when combined with numerous materials and exhibit an exceptionally high thermal conductivity. The involvement of CNTs as building block for the elaboration of selective solar absorber requires however the investigation of various issues such as: (a) the establishment of an appropriate chemistry for the reliable and safe synthesis of CNT-based nanocomposite coatings, (b) proposing novel coating architectures that involve this building block and (c) investigating the chemical thermodynamics of the interfaces. In this project we do propose to address these issues taking advantage of a considerable foreground concerning the material synthesis using chemical vapor deposition and computer design & simulation tools.