Fluorinated Diamond-Like Carbon Films Produced by Plasma Immersion Ion Processing Technique

1999 ◽  
Vol 593 ◽  
Author(s):  
M. Hakovirta ◽  
D. H. Lee ◽  
X. M. He ◽  
M. Nastasi
Keyword(s):  
High Hardness ◽  
Processing Technique ◽  
Carbon Films ◽  
Glow Discharge Plasma ◽  
Diamond Like Carbon ◽  
Elastic Recoil ◽  
Dlc Coatings ◽  
Elastic Recoil Detection ◽  
Wetting Properties ◽  
Detection Analysis

ABSTRACTFluorinated diamond-like carbon (F-DLC) coatings were deposited on polished silicon substrates with plasma immersion ion processing (PIIP) technique. In the PIIP technique, pulsed glow discharge plasma from a mixture of acetylane and hexafluoroethane gases was used. Contact angle measurements were performed in order to see the un-wetting properties of the coatings. The film composition was measured with Rutherford Backscattering Spectroscopy (RBS) and Elastic Recoil Detection Analysis (ERDA) and the hardness was measured with a Nanoindenter® II. The results clearly show that the un-wetting properties and hardness are strongly dependent on the fluorine incorporation in the F-DLC coatings. With optimized gas ratio of acetylane and hexafluoroethane gases, a combination of extremely good un-wetting properties and high hardness was achieved.

scholarly journals Properties and Classification of Diamond-Like Carbon Films

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 315
Author(s):  
Naoto Ohtake ◽  
Masanori Hiratsuka ◽  
Kazuhiro Kanda ◽  
Hiroki Akasaka ◽  
Masanori Tsujioka ◽  
...  
Keyword(s):  
Amorphous Carbon ◽  
Hydrogen Content ◽  
High Hardness ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Elastic Recoil ◽  
Amorphous Carbon Films ◽  
Ternary Diagrams ◽  
Detection Analysis

Diamond-like carbon (DLC) films have been extensively applied in industries owing to their excellent characteristics such as high hardness. In particular, there is a growing demand for their use as protective films for mechanical parts owing to their excellent wear resistance and low friction coefficient. DLC films have been deposited by various methods and many deviate from the DLC regions present in the ternary diagrams proposed for sp3 covalent carbon, sp2 covalent carbon, and hydrogen. Consequently, redefining the DLC region on ternary diagrams using DLC coatings for mechanical and electrical components is urgently required. Therefore, we investigate the sp3 ratio, hydrogen content, and other properties of 74 types of amorphous carbon films and present the classification of amorphous carbon films, including DLC. We measured the sp3 ratios and hydrogen content using near-edge X-ray absorption fine structure and Rutherford backscattering-elastic recoil detection analysis under unified conditions. Amorphous carbon films were widely found with nonuniform distribution. The number of carbon atoms in the sp3 covalent carbon without bonding with hydrogen and the logarithm of the hydrogen content were inversely proportional. Further, we elucidated the DLC regions on the ternary diagram, classified the amorphous carbon films, and summarized the characteristics and applications of each type of DLC.

scholarly journals In vivo biocompatibility of diamond-like carbon films containing TiO2 nanoparticles for biomedical applications

2021 ◽  
Vol 32 (9) ◽  
Author(s):  
C. C. Wachesk ◽  
S. H. Seabra ◽  
T. A. T. Dos Santos ◽  
V. J. Trava-Airoldi ◽  
A. O. Lobo ◽  
...  
Keyword(s):  
Inflammatory Process ◽  
Antimicrobial Properties ◽  
Chemical Vapor ◽  
High Hardness ◽  
Carbon Films ◽  
High Wear Resistance ◽  
Diamond Like Carbon ◽  
Dlc Coatings ◽  
Inflammatory Reactions

AbstractHybrid diamond-like carbon (DLC) with incorporated titanium dioxide (TiO2) nanoparticle coatings have low friction coefficient, high wear resistance, high hardness, biocompatibility, and high chemical stability. They could be employed to modify biomedical alloys surfaces for numerous applications in biomedical engineering. Here we investigate for the first time the in vivo inflammatory process of DLC coatings with incorporated TiO2 nanoparticles. TiO2-DLC films were grown on AISI 316 stainless-steel substrates using plasma-enhanced chemical vapor deposition. The coated substrates were implanted in CF1 mice peritoneum. The in vivo cytotoxicity and biocompatibility of the samples were analyzed from macrophage lavage. Analysis in the first weeks after implantation could be helpful to evaluate the acute cytotoxicity generated after a possible inflammatory process. The in vivo results showed no inflammatory process. A significant increase in nitric oxide production on the uncoated substrates was confirmed through cytometry, and the coated substrates demonstrated biocompatibility. The presence of TiO2 nanoparticles enhanced the wound healing activity, due to their astringent and antimicrobial properties. DLC and TiO2-DLC coatings were considered biocompatible, and the presence of TiO2 nanoparticles reduced the inflammatory reactions, increasing DLC biocompatibility.

Yttrium Oxyhydrides for Photochromic Applications: Correlating Composition and Optical Response

2018 ◽  
Author(s):  
Dmitrii Moldarev ◽  
Elbruz M. Baba ◽  
Marcos V. Moro ◽  
Chang C. You ◽  
Smagul Zh. Karazhanov ◽  
...  
Keyword(s):  
Medical Devices ◽  
Ternary Diagram ◽  
Optical And Electrical Properties ◽  
Ambient Conditions ◽  
Elastic Recoil ◽  
Elastic Recoil Detection Analysis ◽  
Photochromic Properties ◽  
Smart Windows ◽  
Elastic Recoil Detection ◽  
Detection Analysis

It has been recently demonstrated that yttrium oxyhydride(YHO) films can exhibit reversible photochromic properties when exposed to illumination at ambient conditions. This switchable optical propertyenables their utilization in many technological applications, such as smart windows, sensors, goggles, medical devices, etc. However, how the composition of the films affects their optical properties is not fully clear and therefore demands a straightforward investigation. In this work, the composition of YHO films manufactured by reactive magnetron sputtering under different conditions is deduced in a ternary diagram from Time-of-Flight Elastic Recoil Detection Analysis (ToF-ERDA). The results suggest that stable compounds are formed with a specificchemical formula – YH<sub>2-δ</sub>O<sub>δ</sub>. In addition, optical and electrical properties of the films are investigated, and a correlation with their compositions is established. The corresponding photochromic response is found in a specific oxygen concentration range (0.45 < δ < 1.5) with maximum and minimum of magnitude on the lower and higher border, respectively.

Sign in / Sign up

Export Citation Format

Share Document