---
_id: '24243'
abstract:
- lang: eng
  text: "The addition of Ag to amorphous carbon (a-C) films is highly effective in
    tailoring the tribo-mechanical properties and biocompatibility. For biomedical
    applications, Ag-containing a-C (a-C:Ag) represents a promising film material
    for improving the biofunctional surface properties of Ti-based alloys. In a sputtering
    process, a-C:Ag films, with Ag contents up to 7.5 at.%, were deposited with a
    chemically graded TixCy interlayer onto Ti6Al4V. The tribo-mechanical and biocompatible
    properties of a-C:Ag were evaluated. The influence of the Ag content on these
    properties was analyzed and compared to those of uncoated Ti6Al4V.\r\n\r\nRaman
    spectroscopy reveals that the amount of incorporated Ag does not induce significant
    structural changes in the disordered network, only a reduced number of vacancies
    and sp3-coordinated C bonds within the sp2-dominant a-C network is assigned to
    the films with high Ag concentration. With increasing Ag content, stresses, hardness,
    and elastic modulus decrease from (2.02 ± 0.07) to (1.15 ± 0.03) GPa, from (17.4
    ± 1.5) to (13.4 ± 0.9) GPa, and from (171.8 ± 8.1) to (138.5 ± 5.8) GPa, respectively.
    In tribometer tests, the friction behavior against Al2O3 in lubricated condition
    with a simulated-body-fluid-based lubricant is not affected by the Ag concentration,
    but the Al2O3 counterpart wear is reduced for all a-C:Ag films compared to a-C.
    The friction against ultra-high-molecular-weight polyethylene (UHMWPE) decreases
    continuously with increasing Ag concentration and the counterpart wear is lower
    at higher Ag contents. Compared to a-C:Ag, Ti6Al4V demonstrates lower friction
    against UHMWPE and higher friction against Al2O3. The a-C:Ag films are not exposed
    to abrasion by Al2O3 or pronounced material transfer of UHMWPE. The hardness difference
    and chemical affinity between the friction partners are decisive for the tribological
    behavior of a-C:Ag. Compared to Ti6Al4V, the a-C:Ag films show antibacterial activity
    against Staphylococcus aureus, while the proliferation of osteoblast-like cells
    is reduced by Ag."
article_number: '127384'
author:
- first_name: Wolfgang
  full_name: Tillmann, Wolfgang
  last_name: Tillmann
- first_name: Nelson Filipe
  full_name: Lopes Dias, Nelson Filipe
  last_name: Lopes Dias
- first_name: Carlo
  full_name: Franke, Carlo
  last_name: Franke
- first_name: David
  full_name: Kokalj, David
  last_name: Kokalj
- first_name: Dominic
  full_name: Stangier, Dominic
  last_name: Stangier
- first_name: Viviane
  full_name: Filor, Viviane
  last_name: Filor
- first_name: Rafael Hernán
  full_name: Mateus-Vargas, Rafael Hernán
  last_name: Mateus-Vargas
- first_name: Hilke
  full_name: Oltmanns, Hilke
  last_name: Oltmanns
- first_name: Manfred
  full_name: Kietzmann, Manfred
  last_name: Kietzmann
- first_name: Jessica
  full_name: Meißner, Jessica
  last_name: Meißner
- first_name: Maxwell
  full_name: Hein, Maxwell
  id: '52771'
  last_name: Hein
  orcid: 0000-0002-3732-2236
- first_name: Sudipta
  full_name: Pramanik, Sudipta
  last_name: Pramanik
- first_name: Kay-Peter
  full_name: Hoyer, Kay-Peter
  id: '48411'
  last_name: Hoyer
- first_name: Mirko
  full_name: Schaper, Mirko
  id: '43720'
  last_name: Schaper
- first_name: Alexander
  full_name: Nienhaus, Alexander
  last_name: Nienhaus
- first_name: Carl Arne
  full_name: Thomann, Carl Arne
  last_name: Thomann
- first_name: Jörg
  full_name: Debus, Jörg
  last_name: Debus
citation:
  ama: Tillmann W, Lopes Dias NF, Franke C, et al. Tribo-mechanical properties and
    biocompatibility of Ag-containing amorphous carbon films deposited onto Ti6Al4V.
    <i>Surface and Coatings Technology</i>. Published online 2021. doi:<a href="https://doi.org/10.1016/j.surfcoat.2021.127384">10.1016/j.surfcoat.2021.127384</a>
  apa: Tillmann, W., Lopes Dias, N. F., Franke, C., Kokalj, D., Stangier, D., Filor,
    V., Mateus-Vargas, R. H., Oltmanns, H., Kietzmann, M., Meißner, J., Hein, M.,
    Pramanik, S., Hoyer, K.-P., Schaper, M., Nienhaus, A., Thomann, C. A., &#38; Debus,
    J. (2021). Tribo-mechanical properties and biocompatibility of Ag-containing amorphous
    carbon films deposited onto Ti6Al4V. <i>Surface and Coatings Technology</i>, Article
    127384. <a href="https://doi.org/10.1016/j.surfcoat.2021.127384">https://doi.org/10.1016/j.surfcoat.2021.127384</a>
  bibtex: '@article{Tillmann_Lopes Dias_Franke_Kokalj_Stangier_Filor_Mateus-Vargas_Oltmanns_Kietzmann_Meißner_et
    al._2021, title={Tribo-mechanical properties and biocompatibility of Ag-containing
    amorphous carbon films deposited onto Ti6Al4V}, DOI={<a href="https://doi.org/10.1016/j.surfcoat.2021.127384">10.1016/j.surfcoat.2021.127384</a>},
    number={127384}, journal={Surface and Coatings Technology}, author={Tillmann,
    Wolfgang and Lopes Dias, Nelson Filipe and Franke, Carlo and Kokalj, David and
    Stangier, Dominic and Filor, Viviane and Mateus-Vargas, Rafael Hernán and Oltmanns,
    Hilke and Kietzmann, Manfred and Meißner, Jessica and et al.}, year={2021} }'
  chicago: Tillmann, Wolfgang, Nelson Filipe Lopes Dias, Carlo Franke, David Kokalj,
    Dominic Stangier, Viviane Filor, Rafael Hernán Mateus-Vargas, et al. “Tribo-Mechanical
    Properties and Biocompatibility of Ag-Containing Amorphous Carbon Films Deposited
    onto Ti6Al4V.” <i>Surface and Coatings Technology</i>, 2021. <a href="https://doi.org/10.1016/j.surfcoat.2021.127384">https://doi.org/10.1016/j.surfcoat.2021.127384</a>.
  ieee: 'W. Tillmann <i>et al.</i>, “Tribo-mechanical properties and biocompatibility
    of Ag-containing amorphous carbon films deposited onto Ti6Al4V,” <i>Surface and
    Coatings Technology</i>, Art. no. 127384, 2021, doi: <a href="https://doi.org/10.1016/j.surfcoat.2021.127384">10.1016/j.surfcoat.2021.127384</a>.'
  mla: Tillmann, Wolfgang, et al. “Tribo-Mechanical Properties and Biocompatibility
    of Ag-Containing Amorphous Carbon Films Deposited onto Ti6Al4V.” <i>Surface and
    Coatings Technology</i>, 127384, 2021, doi:<a href="https://doi.org/10.1016/j.surfcoat.2021.127384">10.1016/j.surfcoat.2021.127384</a>.
  short: W. Tillmann, N.F. Lopes Dias, C. Franke, D. Kokalj, D. Stangier, V. Filor,
    R.H. Mateus-Vargas, H. Oltmanns, M. Kietzmann, J. Meißner, M. Hein, S. Pramanik,
    K.-P. Hoyer, M. Schaper, A. Nienhaus, C.A. Thomann, J. Debus, Surface and Coatings
    Technology (2021).
date_created: 2021-09-13T08:53:05Z
date_updated: 2023-06-01T14:38:10Z
department:
- _id: '158'
doi: 10.1016/j.surfcoat.2021.127384
language:
- iso: eng
publication: Surface and Coatings Technology
publication_identifier:
  issn:
  - 0257-8972
publication_status: published
quality_controlled: '1'
status: public
title: Tribo-mechanical properties and biocompatibility of Ag-containing amorphous
  carbon films deposited onto Ti6Al4V
type: journal_article
user_id: '43720'
year: '2021'
...