**5.3. SEM-Z contrast-STEM combined experiments**

The special features of the synthesized graphene are presented in **Figure 24** based on the capabilities of the special equipment presented above: *graphene images in SEM mode, Z contrast and STEM modes at the same sample location*. In these amazing images the SEM mode image suggest two graphene sheets one top of the other. This is confirmed by STEM image, since the top part is black denoting thicker structure. On the other hand the Z contrast image is showing only the presence of carbon in the sample. *This is one of the great advantages to have images in different modes on the same sample location*.

**Figure 24.** Graphene images in (a) SEM mode; (b) Z-contrast mode; (c) STEM mode.

### **5.4. HR-STEM experiments**

**Figure 25(a)** is a very good quality HR-STEM image of graphene sheet. We can observe the carbon atoms and their periodically disposal into lattice. Also we performed fast Fourier transform (FFT) and as can be seen in **Figure 25(b)** we identified two directions with crystalline planes.

### **5.5. Nano-diffraction experiments**

To confirm the presence of graphene in our product we performed electron nano-diffraction measurement. We can see in **Figure 26** that the diffraction pattern is confirming the presence of graphene (nicely hexagonally shape).

**Figure 26.** Nano-diffraction experiment on graphene.
