Особенности Морфологии И Оптических Свойств Наноструктур Дисульфида Молибдена От Мономолекулярного Слоя До Фрактолообразной Субструктуры

Abstract

Abstract. The aim of the work is to show the effect of layer thickness on the features of the morphology and optical properties of MoS2 nanostructures, including the monomolecular layers, formed during the gas transporting transfer of sulfur vapors to the reactor hot zone with a molybdenum metal and subsequent deposition on the mica (muscavite) substrates. The results of the atomic force microscopy, optical absorption spectroscopy and Raman spectroscopy of molybdenum disulfide nanostructures of different thickness, obtained in temperatures interval of gas transport synthesis 525-600°C, show that a monomolecular MoS2 layers, containing trigonal domains and having a width of the band gap 1.84 eV at a direct-gap optical transition with the formation of excitons at room temperature, can be obtained. For the first time, fractal-like substructures were obtained, in the Raman spectra of which the values of the modes of intralayer and interlayer oscillations E12g 377.5 cm-1 and A1g 403.8 differ not only from the corresponding values of the modes of the monomolecular layer, but also from the known values of bulk samples. The frequency of the intralayer mode in these samples, E12g 377.5 cm-1, is the smallest of all known values.