Development of Sustainable Hydrophobic Coatings for Textiles Based on Nitrogen Deposition.

Abstract

This study investigates the use of copper nitride (

Cu3N) thin films as a hydrophobic coating for acrylic textiles, offering a

safer and more sustainable alternative to conventional fluorocarbon-based treatments. Copper nitride is a non-toxic, abundant,

and cost-effective semiconductor material with tunable properties, yet its application in textiles remains largely unexplored.

In this work, Cu3N

coatings were deposited on acrylic fabric using reactive sputtering at room temperature, 50W of power

and 3.5 Pa of working pressure, under two different gas atmospheres: pure nitrogen (

N2) and a nitrogen-argon (

N2 + Ar)

mixture. Deposition times were varied at 60, 90, and 120 min to evaluate the influence of process duration on hydrophobic

performance. Hydrophobicity was assessed by measuring the water contact angle on coated samples, both in their initial

state and after mechanical stress tests including washing and folding. The results demonstrated strong hydrophobic behavior

across all samples, with contact angles ranging from 96.30° to 113.68°. Notably, coatings deposited under N2

+ Ar showed

slightly enhanced performance and durability compared to those deposited under pure N₂. The entire process was conducted

at room temperature and generated no chemical waste, highlighting its environmental advantages. These findings

suggest that copper nitride coatings can effectively impart hydrophobicity to textiles without relying on harmful fluorinated

compounds. The combination of performance, safety, and sustainability positions Cu3N

as a promising candidate for future

textile finishing technologies.