Abstract
We used X-ray diffraction, and Raman and photoluminescence (PL) spectroscopies to examine the structure and optical properties of molybdenum disulfide (MoS2) crystals grown by friction at the interface between two materials. MoS2 is produced chemically from molybdenum dithiocarbamates (MoDTC) in synthetic oil under sliding friction conditions. The X-ray diffraction (XRD) patterns indicate that the structure of the MoS2 is layered with the c-axis perpendicular to the surface. The MoS2 layer was formed on stainless steel and germanium by friction at the interface between these materials and high carbon chromium bearing steel. The number of layers is estimated to be N (N > 6) from the distance between the Raman frequencies of the E12g and A1g modes. For MoS2 grown on stainless steel, exciton peak is observed in the PL spectrum at room temperature. These results show that this friction induced crystal growth method is viable for synthesizing atomic layers of MoS2 at solid surfaces.
Highlights
Molybdenum disulfide (MoS2) is a two-dimensional (2D) transition metal dichalcogenide (TMDC) semiconductor crystal that exhibits optoelectronic properties suitable for low electrical power, high-speed devices.[1]
Stainless steel is commonly used for tribological studies and the well-known tribochemical properties of molybdenum dithiocarbamates (MoDTC) confirm that the in-house experimental setup used for the friction experiments in this study is suitable
Friction induced crystal growth has been realized for the first time, and the indications are that the optical quality of the MoS2 obtained by this method under optimum conditions is comparable to exfoliated MoS2 and chemical vapor deposition (CVD) grown MoS2
Summary
Molybdenum disulfide (MoS2) is a two-dimensional (2D) transition metal dichalcogenide (TMDC) semiconductor crystal that exhibits optoelectronic properties suitable for low electrical power, high-speed devices.[1] Recently, our group has studied properties of 2D materials.[2,3,4] Bulk. Raman and photoluminescence spectroscopies to examine the structure and optical properties of friction induced MoS2 crystals grown at the interface between two materials. Stainless steel is commonly used for tribological studies and the well-known tribochemical properties of MoDTC confirm that the in-house experimental setup used for the friction experiments in this study is suitable. Friction induced crystal growth has been realized for the first time, and the indications are that the optical quality of the MoS2 obtained by this method under optimum conditions is comparable to exfoliated MoS2 and CVD grown MoS2
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