Figure 6.

Micro-Raman microscopy analyses on CaCO₃ deposited on silicon substrates by sequential or mixing experiments showing optical microscopy images and CaCO₃ phase overlaid color Raman maps. (A,B) CaCO₃ deposited on the Spi SOM substrate from a CaCO₃ dispersion (A) and on the silicon substrate from a Spi SOM–CaCO₃ mixture (B). (C,D) CaCO₃ deposited on the Opa SOM substrate from a CaCO₃ dispersion (C) and on the silicon substrate from an Opa SOM–CaCO₃ mixture (D). In the overlaid color Raman map, green indicates ACC and blue indicates calcite. The red background is due to the silicon substrate. The mineral phases were assigned according with previous studies.^33,34 Scale bar: 4 μm.