Figure 2

SEM imaging of single layer graphene and ultrafast pump-probe transient absorption spectroscopy.
(a) SEM imaging of graphene on SiO2/Si substrate. (b) Raman spectrum of graphene in Fig. 1(a). (c) Ultrafast pump-probe transient absorption spectroscopy (VIS) of graphene excited by 400 nm laser. (d) The fitted dynamic curve at 532 nm. (e) Ultrafast pump-probe transient absorption spectroscopy (NIR) of graphene excited by 400 nm laser. (f) The fitted dynamic curve at 1103 nm.