Flexible antibacterial Zr-Cu-N thin films resistant to cracking

Jindřich Musil, Michal Zítek, Karel Fajfrlík, Radomír Čerstvý

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This study investigates how the Cu concentration in Zr-Cu-N films affects the films' antibacterial capacity and mechanical properties. Zr-Cu-N films were prepared by reactive magnetron sputtering from composed Zr/Cu targets using a dual magnetron in an Ar + N2 mixture. The antibacterial capacity of Zr-Cu-N films was tested on Escherichia coli (E. coli) bacteria. The mechanical properties of Zr-Cu-N films were determined from the load vs. displacement curves measured using a Fisherscope H 100 microhardness tester. The antibacterial capacity was modulated by the amount of Cu added to the Zr-Cu-N film. The mechanical properties were varied based on the energy Ei delivered to the growing film by bombarding ions. It was found that it is possible to form Zr-Cu-N films with Cu concentrations ≥10 at. % that simultaneously exhibit (1) 100% killing efficiency Ek for E. coli bacteria on their surfaces, and (2) (1) high hardness H of about 25 GPa, (2) high ratio H/E≥ 0.1, (3) high elastic recovery We ≥ 60% and (4) compressive macrostress (σ < 0). The Zr-Cu-N films with these parameters are flexible/antibacterial films that exhibit enhanced resistance to cracking. This enhanced resistance was tested by (1) bending the Mo and Ti strip coated by sputtered Zr-Cu-N films (bending test) and (2) loading the surface of the Zr-Cu-N sputtered on a Si substrate by a diamond indenter at high loads up to 1 N (indentation test). Physical, mechanical, and antibacterial properties of Zr-Cu-N films are described in detail. In summary, it can be concluded that Zr-Cu-N is a promising new material for creating flexible antibacterial coatings on contact surfaces.

Original languageEnglish
Article number021508
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume34
Issue number2
DOIs
Publication statusPublished - 1 Mar 2016

Fingerprint

Thin films
thin films
mechanical properties
Escherichia
Mechanical properties
Escherichia coli
bacteria
Bacteria
Diamond
Reactive sputtering
Bending tests
Film growth
Indentation
Magnetron sputtering
Microhardness
test equipment
indentation
microhardness
Diamonds
strip

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Flexible antibacterial Zr-Cu-N thin films resistant to cracking. / Musil, Jindřich; Zítek, Michal; Fajfrlík, Karel; Čerstvý, Radomír.

In: Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, Vol. 34, No. 2, 021508, 01.03.2016.

Research output: Contribution to journalArticle

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