  Transition metal dichalcogenides (TMDCs) are promising materials for
applications in nanoelectronics and correlated fields, where their metallic
edge states play a fundamental role in the electronic transport. In this work,
we investigate the transport properties of MoS$_2$ zigzag nanoribbons under a
butadiene (C$_4$H$_6$) atmosphere, as this compound has been used to obtain
MoS$_2$ flakes by exfoliation. We use density functional theory combined with
non-equilibrium Green's function techniques, in a methodology contemplating
disorder and different coverages. Our results indicate a strong modulation of
the TMDC electronic transport properties driven by butadiene molecules anchored
at their edges, producing the suppression of currents due to a backscattering
process. Our results indicate a high sensitivity of the TMDC edge states. Thus,
the mechanisms used to reduce the dimensionality of MoS$_2$ considerably modify
its transport properties.
