Revealing the band gap of long linear carbon chains

Resumen del póster presentado al XXXth International Winterschool on Electronics Properties of Novel Materials: "Molecular nanostructures", celebrado en Kirchberg, Tirol (Austria) del 13 al 20 de febrero de 2016.-- et al.The band gap of short linear carbon chains (LCCs) with less than 44 carbon atoms has been well studied in ether gas phase or in solvent. However, the band gap for long LCCs (LLCCs) still keeps unknown due to the lack of proper stable samples. Recently, we successfully synthesized extremely long LCCs composed of thousands of carbon atoms inside double walled carbon nanotubes (DWCNTs). Unlike the normal method tested by absorption spectroscopy, here the band gaps of those LLCCs were revealed by resonance Raman spectroscopy under various temperatures, because of the indistinguishable absorption of LLCCs compared to the absorption of their host nanotubes. The results show that the band gaps of LLCCs in the range of 1.8 - 2.3 eV inversely proportional to their lengths, which is also perfectly consistent with our DFT calculations.We thank the FWF (NanoBlends I 943–N19) and the EU.Peer reviewe