2.7. Surface morphology analysis
Sample was mounted onto a scanning electron microscope (SEM) specimen stub with a carbon double-sided tape prior to
coating. Sample was coated with gold using a Bal-Tec SCD 005 sputter coater (Bal-Tec AG, Liechtenstein) and subsequently photographed using a Leo 1455 variable pressure SEM (Germany) at 25 and 100 magnifications