Surface deformation studies of MnO₂ film by double exposure digital holographic interferometry technique

In the present paper, the MnO₂ films have been deposited on stainless steel support by potentiostatic mode of electrodeposition at different times. The x-ray diffraction, Fourier transform infrared spectroscopy along with Energy-dispersive x-ray spectroscopy analysis confirmed formation of amorphous MnO₂ coating. The surface analysis by field emission scanning electron microscope indicated development of fractures with increasing film thickness. The in situ measurement of stress to the substrate and MnO₂ film thickness during deposition is performed by non-destructive double exposure digital holographic interferometry (DEDHI) technique. It was observed that the stress to the substrate decreases with increasing MnO₂ film thickness. This study opens application of DEDHI for non-destructive measurement using simple mathematical interpretation. (paper)