Chemistry Reference
In-Depth Information
The products of these reactions were characterized by transmission
electron microscopy (TEM), atomic force microscopy (AFM), field
emission
scanning
electron
microscopy
(FESEM)
and
Raman
spectroscopy in addition to X-ray Diffraction (XRD).
XRD patterns of the molybdenum sulphide samples obtained by the
three methods do not exhibit the (002) reflection as shown in Fig. 12(a).
Energy dispersive x-ray analysis (EDAX) shows the products to be
stoichiometric MoS
2
. TEM images of the products obtained from these
three procedures show the presence of one or few layers of MoS
2
as can
be seen from Fig. 13.
Fig. 16. (a) and (b) the TEM images of MoS
2
layers obtained by Methods 2 and 3, (c) is
the high resolution TEM image of layered MoS
2
from Method 3, (d) and (e) images of
WS
2
layers from Methods 1 and 2 respectively. The bends in the layers can arise from
defects (From reference 81).
