Muhammad Shahid Arshad (Author), Lucija Čoga (Author), Janez Kovač (Author), Thomas M. Geue (Author), Sandra Cruz (Author), Mitjan Kalin (Author)

Abstract

This study investigated the impact of tungsten species in tungsten-doped diamond-like carbon (WDLC) coatings on their interactions with ionic liquids (ILs). Using analytical techniques such as in-situ neutron reflectometry, time-of-flight secondary ion mass spectrometry, and Raman spectroscopy, we examined the adsorption mechanism of tributylmethylphosphonium dimethylphosphate on WDLC and undoped hydrogenated DLC (hDLC) coatings. These techniques provide high-resolution insights into the molecular interactions, revealing that tungsten doping enhances the formation of tungsten carbide and tungsten oxides. These species facilitate the dissociation of dimethylphosphate anions, forming a robust 0.75 nm-thick tungsten phosphate layer on the WDLC surfaces. This layer, which adheres strongly even after cleaning, underscores the role of tungsten in enhancing the effectiveness and lubrication properties of WDLC coatings with ILs.

Keywords

WDLC coatings;adsorption mechanism;ionic liquid;neutron reflectometry;measurement;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 543.424.2
COBISS: 218359043 Link will open in a new window
ISSN: 0301-679X
Views: 35
Downloads: 16
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Other data

Type (COBISS): Article
Pages: str. 1-11
Issue: ǂVol. ǂ201, [art. no.] 110220
Chronology: 2025
DOI: 10.1016/j.triboint.2024.110220
ID: 25486182