Hello RG fellows, I am trying to coat/deposit a thin layer via PECVD on Polypropylene substrate. The functionality of the coating will be water-vapor barrier. Which precursors are the best for this purpose? Thanks!
Hi Martin,
it is not easy to reply because of many options and variables.
By my knowledge, if the thickness is higer than some 0.2-0.3 mm and the substrate is not greatly flexible, then 100 - 500 nm thick SiOx based coatings obtained starting for example from HMDSO are a good solution. I tried in the past with multialyer coatings based on different SiOx design with satisfactory results in terms of barrier properties. Otherwise, if the substrate is greatly flexible the film risks to be fractured and lose its barrier properties. In such case polymeric coatings with lower barrier properties but higher flexibility should be more effective. Best regards, Simone
Thank you very much Simone Vezzù , I will take that into account. I've been using precisely HMDSO without success for water vapor barrier, on the other hand great Oxygen barrier. I will keep trying...
I would look into silicon nitride. It is used as a hermetic barrier in semiconductors and some of the deep conditions could work for PP. Check the Appendix A in the link: https://www.gelest.com/themencode-pdf-viewer/?file=https://www.gelest.com/wp-content/uploads/ECS-J.-Solid-State-Sci.-Technol.-2017-Kaloyeros-P691-714.pdf
If you use for the test, there is nothing better than an electric current for water vapor. But if you need a used tool, you should use waterproof alloys such as aluminum glazing.
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