what is your material?

You can determine the density of the film by using Archimedes Principle. From the density and knowing the film thickness you can estimate the mass of your thin film.

Thanks

Many thanks you for your help !

The material is Polyethylene terephthalate (PET)

I can get the density but not the thickness of the layor on the PET film. Without knowing the thickness, i try to find the surface weight of this black layor but i'm wondering how and which technologie is adapted.

the thickness can be measured by AFM or any other profilometer (Veeco, dektak, ...) or by cross sectional profiling in SEM, TEM

Thank you for your help Gabriel !

The thickness of the deposited film can be measured by a quartz microbalance, if you know the material density.

If you use a profilometer you need to have only part of your substrate covered, and measure the height difference between a part that is covered and a part that is not.

Yes i know the density of the material ! 

Thank you Roman and Pieter for the information

the film thickness you can determine by using weighting methods,   if you know the material density

Dear Hersh Khizir

Peace be upon you

It is not prefer to determine the thickness of thin films by using the weighting methods because the accuracy of measurements may not be fine.

Yours,

Ahmed Saeed Hassanien

I agree with Ahmed saeed hassanien.

I best option would be checking the sectioned part in optical microscope with an image analyser where the differences in thickness would be seen differently due to its density difference.

Hope this would suffice

 Thank you for your answer Arul, but the thin fim is opaque (back) so i'm not sure that the optical way with microscope could work even what you said is totally logical

Its as simple as jut cover the part with thin film of aluminium foil then you look under microscope. u will get it.

ok ! Many thank's