Microstructure of upper surface and cryo-fractured crosssection of the film samples was visualised using a scanning electron microscope (SEM) (JEOL JSM-5800 LV, Tokyo, Japan) at an accelerating voltage of 10 kV
Microstructure of upper surface and cryo-fractured crosssectionof the film samples was visualised using a scanning electronmicroscope (SEM) (JEOL JSM-5800 LV, Tokyo, Japan) at an acceleratingvoltage of 10 kV