Film thicknesswasmeasuredusingadigitalmicrometer
(MitutoyoAbsolute,TesterSangyoCo.,Ltd.,Tokyo,Japan).Five
replicationswereconductedforeachsampletreatment.Five
measurementsweretakenatrandompositionsaroundthe film
sample andthemeanvalueswerecalculated.Filmdensitywas
determinedfromthe film weightandvolume.The film volumewas
calculatedfrom film theareaandthickness.