Figure 4. Schematic presentation of the chemical interaction between TTDCS and Si in (a), TTDCS and SiO2 in (b), 
-MPTS and Si in (c), and –MPTS and SiO2 in (d), respectively.
Figure 4. Schematic presentation of the chemical interaction between TTDCS and Si in (a), TTDCS and SiO2 in (b), -MPTS and Si in (c), and –MPTS and SiO2 in (d), respectively.