Transmission Properties of FeCl3-Intercalated Graphene and WS2 Thin Films for Terahertz Time-Domain Spectroscopy Applications

Abstract

Time-resolved terahertz spectroscopy has become a common method both for fundamental and applied studies focused on improving the quality of human life. However, the issue of finding materials applicable in these systems is still relevant. One of the appropriate solution is 2D materials. Here, we demonstrate the transmission properties of unique graphene-based structures with iron trichloride FeCl 3 dopant on glass, sapphire and Kapton polyimide film substrates that previously were not investigated in the framework of the above-described problems in near infrared and THz ranges. We also show properties of a thin tungsten disulfide WS 2 film fabricated from liquid crystal solutions transferred to a polyimide and polyethylene terephthalate substrates. The introduction of impurities, the selection of structural dimensions and the use of an appropriate substrate for modified 2D layered materials allow to control the transmission of samples for both the terahertz and infrared ranges, which can be used for creation of effective modulators and components for THz spectroscopy systems. Electronic supplementary material The online version of this article (10.1186/s11671-019-3062-3) contains supplementary material, which is available to authorized users.

Transmission properties of van der Waals materials for terahertz time-domain spectroscopy applications

“…The few layer and multilayer graphene samples were then intercalated with FeCl 3 vapours in a CVD system, using an established process within a three zone furnace [5,6,7]. The intercalated samples were transferred to glass, sapphire and flexible polyimide (Kapton) substrates with 1 mm, 0.8 mm and 0.125 mm thicknesses, respectively [8]. Phosphorene samples were fabricated by a novel controlled low-potential electrochemical exfoliation method in a non-aqueous oxygen-free medium for producing high-quality few-layer micron lateral size phosphorene with 100% yield and with minimized surface oxidation [9].…”

“…Mixed WS 2 and h-BN films were made by using a 50/50 mixture of the original dispersions and following the same transfer method again. The transmission properties of the Van der Waals materials samples were studied by using absorption spectroscopy in VIS-NIR ranges and terahertz time-domain spectroscopy [8] in the 0.1-1 THz range.…”

Исследование тонких пленок hBN / WS2 методом терагерцевой спектроскопии с разрешением во времени

“…In the form of a thin film, this material is a set of several monolayers containing a layer of tungsten atoms, enclosed between two planes of sulfur. The set of unique properties of WS 2 opens up wide possibilities for its application in communication systems, as well as THz spectrometers as a radiation modulator [6,7]. Furthermore, one of the works [8] demonstrated the possibility of using thin films of boron nitride with hexagonal lattice (hBN) to increase the stability of the optical properties of molybdenum disulfide, a material that is largely similar in structure to WS 2 .…”

“…В виде тонкой пленки данный материал представляет набор нескольких монослоев, содержащих в себе слой атомов вольфрама, заключенный между двумя плоскостями серы. Совокупность уникальных свой ств WS 2 открывает широкие возможности для его применения в системах коммуникаций, а также ТГц спектрометрах в качестве модулятора излучения [6,7]. Кроме того, в одной из работ [8] была продемонстрирована возможность использования тонких пленок нитрида бора с гексагональной кристаллической решеткой (hBN) для повышения…”

Анизотропия Оптических Свойств Пленок Гексагонального Нитрида Бора

“…Такие пленки широко исследовались для различных двумерных материалов, и было показано, что дисперсии оксида графена и дисульфида молибдена дают высококачественные пленки [3][4][5][6][7]. Перенос или осаждение тонких пленок, полученных в результате фильтрации дисперсии, производили описанным ранее способом [8][9][10]. Широкое использование данной технологии указывает на простоту и масштабируемость метода расширенной интеграции двумерного материала.…”