Anisotropic transport properties of graphene-based conductor materials

We analyzed nanographite-based materials in a combined study including experimental analysis via 4-point probe STM and simulation to provide a complete picture of microscopic and macroscopic properties of the material. The two- and three-dimensional transport regimes were determined and evaluated regarding the anisotropy of the conductivity. The experimental results yield the full macroscopic conductivity tensor. Microstructural simulations are used to map those macroscopic properties to the microscopic building blocks of the sample. By combining those two, we present a coherent and comprehensive description of the electrical material parameters across several length scales.

Phase Transition and Anisotropic Transport of MoS 2 /Chlorophyll Van der waal Heterostructure Formed via Biomimetic Photo-electron Donation

In atomically-thin two-dimensional Vander-Waal-heterostructure [VDWHs], phase transition due to biomimetic photoelectron donationwith molecular ad-layer has never been explored. In this pursuit, systematic quantification of biomimetic-optical-creation of stable easy-solution-processed 1T MoS2 chlorophyll (CHL-a) VDWHs has been examined. The 1T phase transformation dynamics and stabilization phenomenon have been quantified by optical anisotropy and Time-correlated-single-photon-counting. The material shows Luttinger transport phenomenon in the two-port device and supports MoS2 interfaces can be fine-tuned with the molecular ad-layer as a result of strong anisotropic finite range correlation. This is validated by Density-Function-Theory. The negative differential resistance in Luttinger transport arises from conformational heterogeneity of CHL-a related to the scaling of Van der waal distances, which regulates coupling strength with temperature as supported by Molecular-Dynamics simulation. The photo-induced evolution of novel “anisotropic heterojunction” can stimulate a plethora of function-designable 2D VDWHs creation.