As a result, Ag-assisted exfoliation has not been demonstrated under ambient conditions or even in a glove box, but only under UHV conditions. The higher reactivity of the Ag surface compared to the Au surface is also reflected in the Raman spectra in Figure , where larger phonon softening was obtained for Raman modes of MoS2 on a silver substrate. The stronger interaction of MoS2 and Ag also resulted in a higher exfoliation yield and enhanced layer homogeneity (Figure ), where only insignificant traces of bulk layers can be found.