Surface characterization and orientation interaction between diamond- like carbon layer structure and dimeric liquid crystals

INERA Workshop 2016: Membrane and Liquid Crystal Nanostructures

Naradikian, H.^1 ; Petrov, M.^1 ; Katranchev, B.^1 ; Milenov, T.^2 ; Tinchev, S.^2

Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko chaussee Blvd., Sofia

1784, Bulgaria^1

Institute of Electronics, Bulgarian Academy of Science, 72 Tzarigradsko chaussee Blvd., Sofia

1784, Bulgaria^2

关键词: Activated surfaces;    Diamond like carbon;    Dimeric liquid crystals;    Hexagonal rings;    Orientation interaction;    Pi interactions;    Surface characterization;    Surface-anchoring;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/780/1/012010/pdf
DOI  :  10.1088/1742-6596/780/1/012010

来源: IOP

【 摘 要 】

Diamond-like carbon (DLC) and amorphous carbon films are very promising type of semiconductor materials. Depending on the hybridization sp2/sp3ratio, the material's band gap varies between 0.8 and 3 eV. Moreover carbon films possess different interesting for practice properties: comparable to the Silicon, Diamond like structure has 22-time better thermal conductivity etc. Here we present one type of implementation of such type nanostructure. That is one attempt for orientation of dimeric LC by using of pre-deposited DLC layer with different ratio of sp2/sp3hybridized carbon content. It could be expected a pronounced π1-π2interaction between s and p orbital levels on the surface and the dimeric ring of LC. We present comparison of surface anchoring strengths of both orientation inter-surfaces DLC/dimeric LC and single wall carbon nanotubes (SWCNT)/dimeric LC. The mechanism of interaction of dimeric LC and activated surfaces with DLC or SWCNT will be discussed. In both cases we have π-π interaction, which in combination with hydrogen bonding, typical for the dimeric LCs, influence the LC alignment. The Raman spectroscopy data evidenced the presence of charge transfer between contacting hexagonal rings of DLC and the C = O groups of the LC molecules.