Nanocomposites and nanomaterials 
Tribological properties of Ti-DLC coatings modified by perfluoro and alkylphosphonic acids 
M. Prowizor1, E. Borkowska1, M. Cichomski1
1 Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz, Poland. 
E-mail: milena.prowizor@chemia.uni.lodz.pl

Growing interest of self-assembled monolayers comes from the fact that are used them for modification of miniature semiconductor structures such as micro-nanoelectromechanical systems (MEMS/NEMS) and also biomedical devices. Due to a number of advantages, the phosphonic acids are used to modify the surface causing a change in the physicochemical properties of the substrate and solving many problems that prevent its use1. 
The research carried out included characteristics of physicochemical properties thin layers of phosphonic acids formed by deposition of decylphosphonic acid (DP), octadecylphosphonic acid (ODP) and 1H, 1H, 2H, 2H-perfluorodecylphosphonic acid (PFDP). Perfluoro and alkylphosphonic self-assembled monolayers were characterized using different techniques: Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and scanning electron microscopy (SEM) and a goniometer and microtribometer. 
The results of the conducted research have shown that the adsorbed self-assembly layers of perfluoro and alkylphosphonic acids cause an increase in hydrophobicity and a reduction in the coefficient of friction, which is extremely important in terms of their potential applications.

This work was supported by the National Science Centre, research Grant 
No. 2014/13/B/ST8/03114.

1.	Cichomski M., Burnat B., Prowizor M., Jędrzejczak A., Batory D., Piwoński I., Kozłowski W., Szymański W, Dudek M., Tribological and corrosive investigations of perfluoro and alkylphosphonic self-assembled monolayers on Ti incorporated carbon coatings // Tribology International-2019.-130.-P. 359-365.