Temperature-dependent Transport Properties of CVD grown Graphene with Pd Functionalization

We have investigated the temperature dependence of carrier density and mobility of CVD grown graphene before and after 2nm Pd deposition by Hall effect measurement. In our samples, Hall mobility increases as temperature increases, indicating that Coulomb scattering is the most important scattering mechanism. The Pd functionalization layer scattering limited carrier mobility is calculated as a function of temperature, and a least-square fit is done. Furthermore, Hall mobility of the Pd-functionalized graphene enhances significantly after exposure to H$_{2}$ and the dominant scattering mechanism switches to thermal excited substrate optical phonon scattering.