Absorption spectrum of carbon nanocages

In the current research, hollow carbon nanocages are synthesized and characterized by electronic microscopy. It shown that the nanocages have 3–5 nm size and consist of few carbon layers with oxygen addition. The experimental and theoretical study of their absorption spectrum is provided. A simple model of electron energy spectrum is supposed. It is used for calculation of optical absorption spectrum. We have found that the theoretical results are in qualitative agreement with the experimental measurements in IR-band. Thus, the analysis of optical properties of nanocages is provided. They can be used as a pretty optical absorber in IR-band in integral photonics devices.