Hybrid Nanosystems Based on Metal-Containing Mesogenic CyanoAlkyl and Alkoxybiphenylsстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 2 сентября 2020 г.
Аннотация:The paper reviews the results of the authors on the production of hybrid nanosystems based on liquid crystalline (LC) long-chain cyano(alkyl and alkoxy)biphenyls (5CB, 5OCB, and 8CCB) including nanosized metal species. The samples were obtained through the direct incorporation of metal (silver and copper) atoms and small clusters into mesogenic CB matrices via a low temperatureco-condensation technique, and the formation of biligand metal complexes were revealed by FTIRand ESR-spectroscopy. The heating of the systems led to the controlled growth of metal clustersand nanosized metal particles of the definite size beginning from 1 up to 200 nanometers, and theirhighly-ordered assemblies stabilized in the solid and liquid crystalline phases. It is shown thatsupramolecular ordering in dierent LC phases of cyanobiphenyl matrices determines the sizeand shape of nanosized metal species that are formed in the systems under investigation, as wellas the morphology of their aggregates. TEM and atomic force microscopy (AFM) data revealedthe existence of orientationally-ordered nanostructures in the nematic phases of 5CB and 5OCB.The growth of quasi-fractal 2D-aggregates was shown for layer-structured smectic mesophase of8CB. The UV–Visible spectra of hybrid metal–mesogenic nanosystems Ag-5CB and Cu-5CB that wereincorporated into polymeric films revealed intensive plasmonic bands at 400–450 nm, similar to silvernanoparticles, and 540–650 nm, similar to copper nanoparticles. The increasing of the metal contentsin the samples caused the growth of highly anisometric shaped metal rods, with the ratio of the lengthto the diameter being more than 10 and plasmonic bands at region of 650 nm.