Schematic illustration of liquid exfoliation process, XRD results, TEM, and theoretically perfect crystal structure of WS2. (a) Schematic illustration of liquid exfoliation process from bulk WS2 to ultrathin nanosheets. (b) XRD results for pristine WS2 bulk (black line) and the exfoliated nanosheets (red line), the blue line is the standard WS2 diffraction peaks got from JCPDS card no. 85-1068. (c) TEM image of the exfoliated WS2 nanosheets. (d) A theoretically perfect crystal structure of the single-layered WS2.
Mao et al. Nanoscale Research Letters 2013 8:430 doi:10.1186/1556-276X-8-430