Towards large scale integration of MoS/graphene heterostructure with ALD-grown MoS.

In the pursuit of ultrathin and highly sensitive photodetectors, a promising approach involves leveraging the combination of light-sensitive two-dimensional (2D) semiconducting transition-metal dichalcogenides, such as MoSand the high electrical conductivity of graphene. Over the past decade, exfoliated 2D materials and electron-beam lithography have been used extensively to demonstrate feasibility on single devices. But for these devices to be used in the real-world systems, it is necessary to demonstrate good device performance similar to lab-based devices with repeatability of the results from device to device and a path to large scale manufacturing.

Interpretation of the pressure-induced Raman frequency shift of the ν stretching bands of CH and N within CH-CO, N-CO and CH-N binary mixtures.

The relationships between the frequency shift of the ν stretching bands of CH and N with pressure (or density) and composition have been previously provided in the literature as reliable parameters for accurate empirical barometers and densimeters for the direct determination of the pressure or density of gas mixtures. However, the latter results still remain a pure description of the experimental data without any interpretation of the physical mechanisms hidden behind the variation trend of the observed peak position. The present paper is devoted to interpreting the origin of the pressure-induced vibrational frequency shifts of the ν stretching bands of CH and N within CH-CO, N-CO and CH-N binary mixtures at the molecular level.

Quantitative Measurements of Composition, Pressure, and Density of Microvolumes of CO-N Gas Mixtures by Raman Spectroscopy.

Quantitative analysis of gases by Raman spectroscopy is based on relative Raman scattering cross sections (RRSCS) and the evolution of different spectral parameters (peak position, peak area, peak intensity, etc.). However, most of the calibration data were established at low pressure (low density) and without evaluating the effect of the composition.