Optical and IR absorption of multilayer carbon nanowalls

Composition, optical and IR absorption spectroscopy, and complex characterization of multilayer carbon nanowall (CNW) coatings are studied. CNW coatings are made using multistep chemical vapor deposition (CVD) growth by DC discharge plasma enhancement method. Each of the growth steps leads to the formation of structurally and optically similar CNW layers with the average thickness of 1 μm. Optical properties of CNW films reveal no polarization dependence. The absorption of a single CNW layer with the average thickness of 1 μm has record values of 96–99% in the wavelength range from 0.4 to 10 μm, while the mirror reflection from the CNW films decreases steadily with the films thickness. We also demonstrate that the designed CNW films are stable with respect to water and alcohol environment.